Catalogue en ligne Bibliothèque Ecole Nationale Polytechnique d'Alger

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11592–11592

Titre :	Correction to “analysis of membrane and adsorbent processes for warm syngas cleanup in integrated gasification combined - cycle power with CO2 capture and sequestration”
Type de document :	texte imprimé
Auteurs :	David J. Couling, Auteur ; Kshitij Prakash, Auteur ; William H. Green, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11592–11592
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Correction Analysis membrane
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie302162y

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11588-11589

Titre :	Discussion on the kinetics of sulfite oxidation inhibited by ethanol : A reply to “comments on ‘mechanism and kinetics of sulfite oxidation in the presence of ethanol’”
Type de document :	texte imprimé
Auteurs :	Li-Dong Wang, Auteur ; Yong-Liang Ma, Auteur ; Ji-Ming Hao, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11588-11589
Note générale :	Induistrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Discussion Kinetics Oxidation
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie301619e

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - p. 11587

Titre :	Comments on “mechanism and kinetics of sulfite oxidation in the presence of ethanol” : Corrected rate law for sulfite oxidation mechanism with ethanol inhibition
Type de document :	texte imprimé
Auteurs :	David A. Rockstraw, Auteur
Année de publication :	2012
Article en page(s) :	p. 11587
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Comments Mechanism Kinetics
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie3014583

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11572-11586

Titre :	Computational study of the effects of material properties on heat transfer in gas fluidization
Type de document :	texte imprimé
Auteurs :	Qin-Fu Hou, Auteur ; Zong-Yan Zhou, Auteur ; Ai-Bing Yu, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11572-11586
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Fluidization Heat transfer Properties of materials
Résumé :	Heat transfer characteristics of different powders in gas fluidization are investigated by means of a combined approach of discrete element method and computational fluid dynamics. First, the heat transfer characteristics in three flow regimes of group A powders are examined. Then, the effects of the Hamaker constant and particle size, both related to the van der Waals force, are investigated in detail. The results confirm that the convective heat transfer is dominant, and radiative heat transfer becomes important when the bed temperature is high. However, conductive heat transfer also plays a role depending on the flow regimes and material properties. Significant effects of the Hamaker constant and particle size are observed under certain conditions. Finally, an effort is made to quantify the effects of the Hamaker constant, particle size, and inlet gas velocity. The findings should be useful for better understanding and prediction of the heat transfer in gas fluidization.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324808

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11565-11571

Titre :	Release studies of thymol and p - cymene from polylactide microcapsules
Type de document :	texte imprimé
Auteurs :	Isabel M. Martins, Auteur ; Sofia N. Rodrigues, Auteur ; Maria F. Barreiro, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11565-11571
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Microcapsule
Résumé :	The objective of this work is to access the release behavior of thymol and p-cymene used as model core materials with PLA microcapsules. The microcapsules were obtained by a coacervation process developed in a previous work and present a spherical shape with mean particle size of 25 and 37 μm for thymol and p-cymene, respectively. The results have shown that the release of thymol and p-cymene is faster in the first hour keeping almost constant in the subsequent days. The diffusion coefficient in the first hour of release was 1.99 × 10―16 m2/s for thymol and 4.34 × 10―16 m2/s for p-cymene. However, the diffusion was slower if considering a period of 5 days being the diffusion coefficients of 3.34 × 10―19 m2/s for thymol and 3.45 X 10―18 m2/s for cymene.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324807

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11561–11564

Titre :	Vapor – liquid – liquid equilibrium measurements and modeling of the Methanethiol + Methane + Water ternary system at 304, 334, and 364 K
Type de document :	texte imprimé
Auteurs :	Javeed A. Awan, Auteur ; Ioannis Tsivintzelis, Auteur ; Alain Valtz, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11561–11564
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Equilibrium measurements Vapor liquid
Résumé :	New vapor–liquid–liquid equilibrium (VLLE) data for methanethiol (CH3SH) + methane (CH4) + water (H2O) have been obtained at three temperatures (304, 334, and 364 K) and pressures up to 9 MPa. A “static-analytical” method was used to perform all of the measurements. The objective was to provide experimental VLLE data for CH3SH with other natural gas contents at its crude form for which limited or no data are available in the open literature. Such kinds of data are required for the industrial modeling of sulfur emissions. It is observed from the experimental data that the solubility of CH4 in the aqueous and organic phases increases with an increase of the total system pressure and decreases with an increase of the temperature. However, the solubility of CH3SH in the aqueous and organic phases decreases slightly with an increase of the total system pressure and increases significantly with an increase of the temperature. The new VLLE data of this ternary system were compared with predictions of the cubic-plus-association equation of state. The model tends to underpredict the concentration of CH3SH in all phases, particularly the vapor phase.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie300888d

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11555-11560

Titre :	Comparative rapid toxicity screening of commercial and potential “Green” plasticizers using bioluminescent bacteria
Type de document :	texte imprimé
Auteurs :	Pedro A. Segura, Auteur ; Pearl Kaplan, Auteur ; Hanno C. Erythropel, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11555-11560
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Bacteria Plasticizer Toxicity
Résumé :	The Vibrio fischeri bioluminescence inhibition assay (Microtox) was slightly modified to use an in-house diluent containing 2% DMSO and was successfully applied to perform a rapid toxicity screening of 24 compounds including commercial plasticizers and chemicals currently studied as potential "green" plasticizers. Comparison of the EC50 values obtained indicated that 1,3-propanediol dibenzoate (PrDDB), 1,4-butanediol dibenzoate (BDDB), and dihexyl maleate (DHM) might not be good candidates as "green" plasticizers because of their higher toxicity (EC50 < 1 mg L―1). Results also indicated that Microtox is a useful technique to better understand the effect of key structural features on the toxicity of plasticizers. Comparison of EC50 values of similar compounds having a different alkyl chain lengths indicated a decrease in toxicity of dibenzoate plasticizers with respect to increasing alkyl chain size. The Microtox technique that we adapted to test compounds having low solubility was proven to be useful to evaluate the toxicity of potential "green" plasticizers relative to commercial products. However, these results cannot be used alone to select the best candidates. The Microtox technique is complementary to biodegradation experiments and plasticizing properties tests and allows, at the development stage, the screening of a large number of potential "green" plasticizers on the basis of their relative toxicity.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324805

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11547-11554

Titre :	Effect of weak preformed particle gel on unswept oil zones / areas during conformance control treatments
Type de document :	texte imprimé
Auteurs :	Mahmoud O. Elsharafi, Auteur ; Baojun Bai, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11547-11554
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Oil zones Control treatments
Résumé :	Preformed particle gel (PPG) has been developed to reduce fluid channels through super-high-permeability streaks/fractures. This was done to decrease water production and improve sweep efficiency for mature oilfields. The success of a PPG treatment depends primarily on whether or not PPG can selectively penetrate into highly permeable channels or fractures while minimizing penetration into lower permeable, unswept zones/areas. The purpose of this work was to determine what factors influence the damage of PPG on low-permeable, unswept zones. A filtration apparatus was designed to determine the possible penetration of PPG into low-permeable sandstone rocks. Filtration curves (the relationship between injection times and filtration volume) were obtained, and the permeability of sandstone cores, both before and after PPG treatment, was measured to determine whether or not PPGs reduce the permeability of low-permeable rocks. A commercial superabsorbent polymer, LiquiBlock 40K gel, was used as a PPG sample for our filtration experiments. LiquiBlock 40K is a weak gel particle with an elastic module of 400 Pa at 0.05% of NaCl (wt %). The particle sizes of the gel ranged from 30 to 120 meshes. Filtration test results showed that 30–120 meshes of LiquiBlock 40K gel did not propagate in the cores with a permeability of <320 mD. This test also indicated that the gel formed a cake on the rock’s surface. The damage of particle gel on unswept, low-permeable zones/areas was found to be effectively reduced by controlling both the particle size and the concentration of brine that was used to prepare swollen PPG.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie3007227

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11538-11546

Titre :	Selective flotation of chalcopyrite and marmatite by MBT and electrochemical analysis
Type de document :	texte imprimé
Auteurs :	Wenqing Qin, Auteur ; Fen Jiao, Auteur ; Wei Sun, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11538-11546
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Flotation
Résumé :	Various collectors were compared in the selective flotation of copper-zinc ore by using isopropyl ethylthionocarbamate (Z-200), buthl xanthate, ammonium dibutyl dithiophosphate, and mercapto benzothiazole (MBT). The latter showed effective selectivity in the flotation of chalcopyrite and marmatite and was selected for a detailed study by using cyclic voltammetry and Tafel. The results of microflotation pointed out that the flotation of marmatite was significantly affected by CuSO4 activation. At weakly alkaline pH, marmatite activated by Cu2+ is dependent on Cu2+ concentration shown in electrochemical tests, and the activation products were Cu2S and CuS. The increasing addition of Cu2+ may remove the hydroxide and S0, resulting in considerable activation. The corrosion of marmatite is accelerated with the addition of CuSO4. Mechanisms are suggested for the selectivity of chalcopyrite/marmatite by MBT: the hydrophilic hydroxides (Zn(OH)2 and Fe(OH)3) are formed on the marmatite surface, which renders the marmatite surface hydrophilic and hampers the reaction between MBT and marmatite-activated products, while the hydrophobic compounds (MBT)2 and Cu(MBT)2 formed on the chalcopyrite surface improve the flotability of chalcopyrite.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324803

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11530-11537

Titre :	Synthesis and characterization of thiazolium - based room temperature ionic liquids for gas separations
Type de document :	texte imprimé
Auteurs :	Patrick C. Hillesheim, Auteur ; Shannon M. Mahurin, Auteur ; Pasquale F. Fulvio, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11530-11537
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Ionic liquid
Résumé :	A series of novel thiazolium-bis(triflamide) based ionic liquids has been synthesized and characterized. Physicochemical properties of the ionic liquids such as thermal stability, phase transitions, and infrared spectra were analyzed and compared to the imidazolium-based congeners. Several unique classes of ancillary substitutions are eramined with respect to impacts on overall structure, in addition to their carbon dioxide absorption properties in supported ionic-liquid membranes for gas separation.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324802

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11518–11529

Titre :	COSMO - RS - based ionic - liquid selection for extractive distillation processes
Type de document :	texte imprimé
Auteurs :	Juan Pablo Gutiérrez, Auteur ; Geert Wytze Meindersm, Auteur ; Andre B. de Haan, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11518–11529
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Ionic liquid Distillation processes
Résumé :	A solvent selection methodology for extractive distillation processes is applied to identify promising ionic liquid (IL) solvents for the following separation cases: methylcyclohexane/toluene, 1-hexene/n-hexane, and ethanol/water. Thermodynamic and phase stability analyses are done in order to understand the strong interactions between the solutes and ILs (solvents) and vice versa. The solvent preselection is done with COSMOtherm software (version C2.1, release 01.11a). Selectivities and activity coefficients at infinite dilution are predicted. Variations in the IL structure (in the cations and anions) and their effect on the solubility and selectivity are theoretically studied and experimentally confirmed. Suitable ILs are selected by experimentation at finite dilution (real solutions). A suitable IL for the separation of 1-hexene from n-hexane yielding a better performance than the conventional solvent N-methyl-2-pyrrolidone (NMP) was not found. Tetracyanoborate-based ILs seem to be promising solvents for the extractive distillation of toluene from methylcyclohexane as a replacement of the conventional solvent NMP. For the separation of ethanol from water, the ILs 1-ethyl-3-methyl-imidazolium acetate and 1-ethyl-3-methyl-imidazolium dicyanamide (due to its thermal stability) seem to be suitable candidates and possible replacements of ethylene glycol, which is used as a conventional solvent for the separation of this mixture.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie301506n

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11509–11517

Titre :	Measurement of ass transfer rates in adsorbents : New combined - technique frequency response apparatus and application to CO2 in 13X zeolite
Type de document :	texte imprimé
Auteurs :	Timothy J. Giesy, Auteur ; Yu Wang, Auteur ; M. Douglas LeVan, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11509–11517
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Mass transfer Adsorbents
Résumé :	A new combined-technique frequency response apparatus has been developed for studying mass transfer in porous adsorbents. This new apparatus can perform pressure-swing, volume-swing, and concentration-swing frequency response experiments, enabling it to investigate mass transfer of pure components and binary gas mixtures in adsorbents over a wide frequency range. To demonstrate the capabilities of the apparatus, pressure-swing and volume-swing frequency response experiments were performed in tandem to study transport of pure CO2 in 13X zeolite beads over the frequency range from 10–4 Hz to 10 Hz at pressures from 0.125 to 1 bar. Frequency response spectra show that transport in this system is governed by a nonisothermal macropore diffusion resistance with diffusion occurring by a Knudsen-type mechanism. Macropore diffusion control is confirmed by the existence of particle size dependence of the system’s dynamic response. In smaller zeolite particles, the macropore diffusion resistance is lower, and macropore diffusion becomes less important to the system response.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie3014204

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11499-11508

Titre :	Synthesis of a silicalite zeolite membrane in ultradilute solution and its highly selective separation of organic / water mixtures
Type de document :	texte imprimé
Auteurs :	Xiao-Liang Zhang, Auteur ; Mei-Hua Zhu, Auteur ; Rong-Fei Zhou, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11499-11508
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Zeolite Inorganic membrane
Résumé :	A continuous intergrown silicalite zeolite membrane with high pervaporation (PV) performance was successfully prepared on seeded tubular mullite supports in ultradilute solution with a H2O/SiO2 ratio of 800 and an inexpensive template of tetrapropylammonium bromide (TPABr) instead of tetrapropylammonium hydroxide (TPAOH). Several parameters were systematically investigated to evaluate their influence on crystallization and PV performance of the membranes, including the H2O/SiO2 ratio, template type, alkalinity, synthesis temperature, crystallization time, and silica source. The X-ray diffraction (XRD), scanning electron microscopy (SEM), and PV tests were used to characterize the as-synthesized membranes. The crystal growth and separation quality of the silicalite membranes were very sensitive to the H2O/SiO2 ratio and alkalinity in the precursor solution and synthesis temperature. Under the optimized synthesis conditions, the outer surface of support was fully covered with well-intergrown silicalite zeolite layer to form the zeolite membrane. For silicalite membrane prepared with the typical molar composition of synthesis solutions of ISiO2/0.1TPABr/0.2TPAOH/800H2O at 180 °C for 16 h, the flux and separation factor are achieved to 1.91 kg·m―2·h―1 and 66 for a 5 wt % ethanol/water mixture at 60 °C, respectively. Moreover, the membrane prepared with pure TPABr template instead of TPAOH in ultradilute solution also showed the high PV performance with the flux of 1.77 kg·m―2·h―1 and separation factor of 63 under the same tests conditions. Due to the utilization of ultradilute precursor and cheap organic template to prepare the silicalite membrane on cheap mullite supports with high PV performance, the present developed technique could reduce the chemical consumption and decrease the costs of membrane toward an organic/water mixture separation.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324799

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11490-11498

Titre :	Synthesis of li – al layered double hydroxides (LDHs) for efficient fluoride removal
Type de document :	texte imprimé
Auteurs :	Tao, Zhang, Auteur ; Qiurong Li, Auteur ; Haiyan Xiao, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11490-11498
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Hydroxides
Résumé :	A novel adsorbent of Li–Al layered double hydroxides (LDHs) was prepared through the precipitation of metal nitrates and further applied to remove excessive fluoride ions from water. The physical and chemical properties of synthesized materials were examined by powder transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, N2 adsorption/desorption analysis, and thermogravimetric analysis (TGA). The TEM results indicated that the materials synthesized via coprecipitation present a preferential orientation of the nanoscale LDH platelets. The XRD analysis confirmed that the synthesized products have a highly crystalline nature and a well-ordered layer structure. The high specific surface areas (37.24–51.27 m2/g) of calcined products were demonstrated to be beneficial for the adsorption of fluoride. For the adsorption experiment, the effects of the adsorption conditions including pH, coanions and adsorbent dose were investigated at initial fluoride concentration of 20 mg/L. The kinetics and isotherms of fluoride adsorption by calcined Li–Al LDHs were studied. The results indicated that the Li–Al LDHs can be effectively used to remove fluoride from water, where the maximum percentage removal (97.36%) could be reached and the adsorption equilibrium could be attained within 1 h. The kinetic data were well-fitted to the pseudo-second-order model, while the Freündlich isotherm model provided the better correlation of the equilibrium data. Based on FT-IR and kinetic analysis, the “memory effect” may play an important role in the early adsorption stage, while the ion-exchange process may control the adsorption rate at the second adsorption stage. Since the Li–Al LDHs show excellent fluoride removal efficiency, they are expected to separate fluoride from water in pollution control.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie300863x

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11482-11489

Titre :	Integration of enzymatic catalysts in a reactive distillation column with structured packings
Type de document :	texte imprimé
Auteurs :	Rene Heils, Auteur ; Annika Sont, Auteur ; Paul Bubenheim, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11482-11489
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Ordered packing Distillation column Distillation with reactionEnzymatic catalysis
Résumé :	The integrated process setup of reaction and separation in reactive distillation can be favorable for enzyme-catalyzed reactions that are often equilibrium-limited and/or inhibited by the product of the reaction. However, until now, no appropriate way has described the implementation of the enzymes into distillation columns. In this work, a special type of biocatalytic coating for commercially available structured packings was developed to enable enzymatic reactions in reactive distillation columns. Lipase CALB was immobilized within the silica-gel based coating and showed high long-term stability, i.e., the coatings can be stored for at least 50 days at room temperature without any significant loss of enzyme activity. In addition, the silica-gel coatings were stable in organic media and at increased temperatures. Reactive distillation experiments were carried out in a batch reactive distillation setup comprising of structured A3-500 packings from Montz (Hilden, Germany) coated with the catalytic silica gel. Stepwise removal of the low boiling point product from the distillate shifted the equilibrium to the product side and increased the conversion of the reactants from 60% to 98%, in comparison with the corresponding setup in a standard batch reactor. The stability of the silica-gel coating and loss of the enzyme was investigated during the distillation runs. Overall, the integration of an enzymatic reaction into a reactive distillation column offers new possibilities for the application of biocatalysts in organic synthesis.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324797

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11473-11481

Titre :	Removal and recovery of organic solvents from aqueous waste mixtures by extractive and pressure swing distillation
Type de document :	texte imprimé
Auteurs :	G. Modla, Auteur ; P. Lang, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11473-11481
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Distillation Waste water Organic solvent
Résumé :	Different scenarios for handling wastewaters of different concentrations containing acetone and methanol (in equimolar quantities) in order to remove and/or recover organic components are investigated by rigorous simulation. The extractive and pressure swing distillation processes are optimized by genetic algorithm (GA). The different alternatives including incineration of the whole amount of waste are compared on the basis of the capital, operation, and total annual costs. The influence of the water content of the waste mixture is also investigated. The best results are obtained with the separation of the whole quantity of the waste mixture into specified purity products by extractive distillation. The results obtained for pressure swing distillation with heat integration remained only slightly under those of the extractive distillation.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324796

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11463-11472

Titre :	Investigation of shell side heat transfer in cross - flow designed vacuum membrane distillation module
Type de document :	texte imprimé
Auteurs :	Bingwei Qi, Auteur ; Baoan Li, Auteur ; Shichang Wang, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11463-11472
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Membrane separation Membrane distillation Design Crossflow Heat transfer
Résumé :	This paper focuses on the investigation of heat transfer in a cross-flow designed vacuum membrane distillation (VMD) module. The employment of cross-flow membrane module could ensure significant reduction of temperature polarization effect at a relatively low range of Reynolds numbers. According to most literature on VMD, the heat transfer coefficients are usually estimated by the commonly used correlations for nonporous and rigid heat exchangers. However, due to the complex flow regime in module channel, the applicability of these formulas is questioned. In this work, the heat transfer in the shell side of VMD module was studied numerically and experimentally in the Reynolds range from 7.12 to 52.18. The experimental Nusselt numbers obtained in this work are relatively higher than those predicted in the literature for given conditions. The possible reasons leading to the considerable enhancement of heat transfer are analyzed and discussed.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324795

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11458-11462

Titre :	New fraction jetting model for distillation sieve tray efficiency prediction
Type de document :	texte imprimé
Auteurs :	Anand N. Vennavelli, Auteur ; James R. Whiteley, Auteur ; Michael R. Resetarits, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11458-11462
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Prediction Plate column Plate efficiency Perforated tray Distillation Modeling
Résumé :	The two phases on distillation trays can function in several different regimes depending on the physical properties of the system and the liquid-to-vapor ratio. Predicting the fraction of the vapor transported as jets, or fraction jetting, on a tray operating in the mixed-froth regime can bridge froth and spray regime models, explain the gradual changes in tray efficiency during the froth-spray transition, and eliminate the need to predict the froth-spray transition point when separate froth and spray regime models are used. Fraction jetting models will also facilitate multiregime models, such as the Syeda et al. (Chem. Eng. Res. Dev. 2007, 85, 269-277) sieve tray efficiency model, that are valid for both froth and spray regimes. Current fraction jetting models are empirical and developed from limited data. In this paper, the concept of fraction jetting on a sieve tray is discussed and a new semiempirical model is presented. The fraction jetting model was developed using the existing data of Raper et al. (Chem. Eng. Sci. 1982, 37, 501―506) and no new data were generated. Furthermore, the applicability of the fraction jetting model to tray efficiency models that incorporate jetting is demonstrated using the Syeda et al. sieve tray efficiency model.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324794

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11445-11457

Titre :	Multiperiod stochastic optimization model for carbon capture and storage infrastructure under uncertainty in CO2 emissions, product prices, and operating costs
Type de document :	texte imprimé
Auteurs :	Jee-Hoon Han, Auteur ; In-Beum Lee, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11445-11457
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Carbon dioxide Uncertainty Storage Modeling Optimization
Résumé :	A multiperiod stochastic programming model is developed for planning a carbon capture and storage (CCS) infrastructure including CO2 utilization and disposal in an uncertain environment and with a time-varying investment environment. An inexact two-stage stochastic programming approach is used to analyze the effect of possible uncertainties in product prices, operating costs, and CO2 emissions. The proposed model determines where and how much CO2 to capture, store, transport, utilize, or sequester for the purpose of maximizing the total profit of handling the uncertainty while meeting the CO2 mitigation target during each time period of a given planning interval. The capability of the proposed model to provide correct decisions despite a changing uncertain environment is tested by applying it to designing and operating the future CCS infrastructure on the eastern coast of Korea over a 20-year planning interval (2011―2030).
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324793

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11434-11444

Titre :	Technology Integration for Sustainable Manufacturing : An Applied Study on Integrated Profitable Pollution Prevention in Surface Finishing Systems
Type de document :	texte imprimé
Auteurs :	Jie Xiao, Auteur ; Yinlun Huang, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11434-11444
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Pollution prevention Manufacturing
Résumé :	Technology improvement and innovation are of utmost importance in achieving greenness while ensuring economic incentives in manufacturing. Aiming at Profitable Pollution Prevention (P3), design and operation technologies can be developed to enhance manufacturing sustainability through energy and material efficiency increment, source waste reduction, production efficiency improvement, safety assurance, etc. This paper explores opportunities for an effective integration of P3-oriented technologies in a systematic way. It will be shown that the integrated P3 (IP3) technology can be identified through a technology implementation approach based on process fundamentals and engineering practicability needed for process design modification and operational strategy development. A successful application of an IP3 technology in an electroplating process, a main type of surface finishing system, demonstrates the methodological efficacy.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324792

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11417-11433

Titre :	Mixed integer linear programming formulation for aiding planning activities in a complex pipeline network
Type de document :	texte imprimé
Auteurs :	Sergio L. Stebel, Auteur ; Suelen N. B. Magatao, Auteur ; Lucia V. R. Arruda, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11417-11433
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Mathematical programming Pipeline network Planning Mixed integer programming Linear programming
Résumé :	This paper presents an optimization model to reduce the gap between planning and scheduling activities in pipeline networks for supply of petroleum derivatives, so as to effectively operate the plans developed at higher decision levels. Most of the information taken in the petroleum supply chain is unidirectional, from the strategic level passing through the tactical level and finally reaching the operational level. However, unviable schedules are often obtained from an operational standpoint, since operational criteria are not considered when decisions are made at the strategic and tactical levels. In particular, in the supply chain of refined petroleum products, the production campaigns of the refineries are defined for different regions based on the consumer market and no operational conditions related to distribution are accounted at this stage. This fact that may lead to operational infeasibilities. To overcome this type of problem the present paper proposes a Mixed Integer Linear Programming (MILP) approach to validate the refineries' production plans where operational conditions are accounted for, and as a consequence, a decrease in the existent gap between the scheduled and executed operations is obtained. The proposed methodology is applied to a real world case study of a Brazilian Oil company.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324791

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11409-11416

Titre :	Statistical prediction of product quality in batch processes with limited batch - cycle data
Type de document :	texte imprimé
Auteurs :	Ge, Zhiqiang, Auteur ; Zhihuan Song, Auteur ; Gao, Furong, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11409-11416
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Batchwise Prediction
Résumé :	This paper develops a modeling approach to address the end-of-batch product quality prediction problem for batch processes with limited batch-cycle data. Generally, those batch processes that have multiple phases are the focus of the present paper. Different from the traditional multiway/phase-based partial least-squares (PLS) method, which unfolds the three-way data set through the batch direction, the proposed method unfolds the data set through the variable direction, in order to generate more training data samples. Reproducing the product quality data with the noise injection method allows a statistical model to be developed in each phase of the batch process. This, however, does not remove the nonlinearity of the batch process data, as practically addressed by the typical batch normalization. Therefore, a nonlinear regression model is subsequently introduced to handle this problem for product quality prediction modeling. To compare the performance of linear and nonlinear statistical models, phase-based PLS and relevance vector machine models have both been developed for prediction of product quality in an industrial injection molding process.
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324790

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11401-11408

Titre :	Synthesis of cross - linked, partially neutralized poly (Acrylic Acid) by suspension polymerization in supercritical carbon dioxide
Type de document :	texte imprimé
Auteurs :	Yazan A. Hussain, Auteur ; Tao Liu, Auteur ; George W. Roberts, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11401-11408
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Supercritical state Carbon dioxide Suspension polymerization
Résumé :	A novel process for producing superabsorbent polymer of cross-linked, partially neutralized poly(acrylic acid) via suspension polymerization in supercritical carbon dioxide was developed. The process utilized siloxane-based surfactants as suspension stabilizers to produce particles with acceptable size range for commercial applications. The behavior of the suspension mixture and its relation to the final product morphology is discussed. The product performance in terms of water absorbency is presented.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324789

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11389–11400

Titre :	Cellulase adsorption and reactivity on a cellulose surface from flow ellipsometry
Type de document :	texte imprimé
Auteurs :	S. A. Maurer, Auteur ; C. N. Bedbrook, Auteur ; C. J. Radke, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11389–11400
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Adsorption Ellipsometry
Résumé :	Enzymatic deconstruction of cellulose occurs at the aqueous/cellulose interface. Most assays to explore cellulase activity, however, are performed in bulk solution and, hence, fail to elucidate surface-reaction kinetics. We use flow ellipsometry to quantify the adsorption and surface reactivity of aqueous cellulase on a model cellulose film substrate. The rate of cellulose digestion at the aqueous/solid interface increases with increasing bulk concentration of enzyme, but only up to a plateau corresponding to the maximum adsorption density of cellulase. Kinetic data are analyzed according to a modified Langmuir–Michaelis–Menten framework including both reversible adsorption of cellulase to the cellulose surface and complexation of surface cellulose chains with adsorbed cellulase. At ambient temperature, the molar turnover number is 0.57 ± 0.08 s–1, commensurate with literature values, and the Langmuir adsorption equilibrium constant, characterizing the binding strength of the cellulase, is 0.086 ± 0.026 ppm–1. The rate-determining step in the surface-reaction sequence is complexation of adsorbed cellulase with the solid-cellulose surface. Simultaneous knowledge of sorption and digestion kinetics is necessary to quantify cellulose deconstruction.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie3008538

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11381-11388

Titre :	Dynamic modeling of the reactive twin - screw corotating extrusion process : Experimental validation by using inlet glass fibers injection response and application to polymers degassing
Type de document :	texte imprimé
Auteurs :	T. Goma-Bilongo, Auteur ; F. Couenne, Auteur ; C. Jallut, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11381-11388
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Degassing Glass fiber Extrusion Modeling Dynamic model
Résumé :	In this Article is described an original dynamic model of a reactive corotating twin-screw extrusion (TSE) process operated by the Rhodia Co. for the Nylon-66 degassing finishing step. To validate the model, dynamic experiments have been performed on a small-scale pilot plant. These experiments consist of a temporary injection of glass fibers at the inlet of the extruder after it has reached a given operating point. The outlet glass fibers mass fraction time variation is then measured. This experiment does not lead to the RTD measurement. As a matter of fact, due to the high quantity of glass fibers that is introduced, the behavior of the flow through the extruder is perturbed so that the glass fibers cannot be considered as an inert tracer. The dynamic model that we have published elsewhere (Choulak et al. Ind. Eng. Chem. Res. 2004, 43, 7373-7382) is adapted to take into account this nonlinear behavior of the extruder with respect to the glass fibers injection and is favorably compared to experimental results. The description of the degassing operation is also included in the model. The model allows simulations of the complete dynamic behavior of the process. When the steady state is reached, the good position of the degassing vent with respect to the partially and fully filled zones positions can also be checked, thus illustrating the way the model can be used for design purposes.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324787

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11373–11380

Titre :	Formulation of poorly water - soluble compound loaded solid lipid nanoparticles in a microchannel system fabricated by mechanical microcutting method : Puerarin as a model drug
Type de document :	texte imprimé
Auteurs :	Linhong Xu, Auteur ; Xu Tan, Auteur ; Junxian Yun, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11373–11380
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Nanoparticles Microchannel Microcutting method
Résumé :	Delivery of poorly water-soluble compounds by use of nanosized lipid carriers has attracted much attention in pharmaceutical and therapeutic areas in recent years. However, it is difficult to formulate poorly water-soluble compound loaded lipid nanoparticles with narrow size distributions and proper drug load properties. In the present work, we introduce a precise mechanical manufacture method, the microcutting approach, to fabricate a microchannel system on a stainless steel slab, which was then assembled and employed to prepare poorly water-soluble drug loaded solid lipid nanoparticles (SLNs) by liquid flow-focusing and gas displacing techniques. A poorly water-soluble drug, puerarin, was used as the model drug, and the production of puerarin-loaded SLNs was achieved under various conditions. Particle size distribution of the obtained drug-loaded SLNs was measured by dynamic light scattering (DLS), and the particle morphology was observed by transmission electron microscopy (TEM). The state of the drug-loaded SLNs was analyzed by differential scanning calorimetry (DSC), and the drug load was determined by high-performance liquid chromatography (HPLC). The results showed that microchannels fabricated by the present mechanical microcutting method were excellent in surface quality and precise in channel sizes and shapes, which are easily scaled-up. The puerarin-loaded SLNs prepared by the present microchannel system have a narrow size distribution and the mean particle size varied with the velocities of fluids and the lipid concentration. The drug load capacity of puerarin was influenced by preparation parameters, like the flow velocities of liquids and the concentrations of lipid and puerarin. Therefore, by employing suitable preparation parameters, one can produce poorly water-soluble drug loaded SLNs with expected sizes and drug load capacities by use of microchannels fabricated by the microcutting method, which could be an effective and alternative approach for scale-up production of those new nanosized delivery systems containing poorly water-soluble drugs for potential pharmaceutical and therapeutic applications.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie300592u

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11367-11372

Titre :	Intermediary products in the catalytic wet air oxidation of crystal violet with Ni / MgAlO as catalyst
Type de document :	texte imprimé
Auteurs :	Gabriel Ovejero, Auteur ; Araceli Rodríguez, Auteur ; Ana Vallet, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11367-11372
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Catalyst Oxidation Wet air Catalytic reaction
Résumé :	In this study, the performance of Ni supported on MgAlO catalyst to promote Oxidation of crystal violet was investigated. Oxidation experiments were carried out at T = 140―200 °C and total pressures up to 50 bar. The catalyst was prepared by incipient wetness impregnation to obtain catalyst with metal loading of 7 wt %. A detailed reaction network for the wet air oxidation and catalytic wet air oxidation of crystal ciolet on Ni/MgAlO catalyst is proposed in this study. The reaction network proposed takes into account all the detected intermediate products during the dye oxidation. This work represents the first determination of the reaction network of this compound in wet air and catalytic wet air oxidation.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324785

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11355–11366

Titre :	Inlet cone effect on diesel particulate filter regeneration upon a rapid shift to idle
Type de document :	texte imprimé
Auteurs :	Mengting Yu, Auteur ; Dan Luss, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11355–11366
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Diesel engine
Résumé :	The particulate matter (PM) emitted by a diesel engine is collected and then burned in a diesel particulate filter (DPF). A major technological challenge in the operation of the ceramic, often cordierite, filter is that a rapid shift to idle may create a local hot region with a temperature much higher than under stationary feed conditions. This excessive transient temperature rise may cause local melting or cracking of the ceramic filter. Almost all previous studies of temperature excursions during the DPF regeneration (combustion of the deposited PM) were of cases in which equal exhaust flow rate was fed to all the parallel inlet channels. The diesel engine exhaust pipe is sometimes connected to the DPF by a wide-angled cone (diffuser). This leads to a mal-distribution of the flow rate to the inlet channels and of the deposited PM. Simulations revealed that following a rapid shift to idle the highest regeneration temperature in a DPF fed by a cone exceeded that in one not fed by a cone and it may exceed the cordierite DPF melting temperature (1200 °C). Moreover, it may generate transient radial and axial temperature gradients several times higher than under stationary regeneration that may crack the cordierite DPF. The increase in the temperature gradient is especially large in the axial direction. One of the surprising findings is that the highest temperature attained following a step change to idle is not a monotonic function of the initial PM loading.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie300948c

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11348-11354

Titre :	Preparation and characterization of high - performance perfluorosulfonic acid / SiO2 nanofibers with catalytic property via electrospinning
Type de document :	texte imprimé
Auteurs :	Pei-Pei Lu, Auteur ; Zhen-Liang Xu, Auteur ; Hu Yang, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11348-11354
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Catalytic reaction Preparation
Résumé :	Polymer nanofiber-supported perfluorosulfonic acid (PFSA)/SiO2 catalysts are successfully fabricated by electrospinning method from polymer/nanoparticle suspensions. This kind of catalyst has a large number of active acid sites and high specific surface area up to 85.6 m2/g. Scanning electron microscope images reveal that the catalysts present high porosity and inner-connected porous structure which varies much with SiO2 loading. Nitrogen adsorption-desorption measurements demonstrate a wide distribution of pore sizes inside the composites. Catalysts of different compositions are evaluated in esterification in a batch reactor under various conditions, and the results indicate that those of 20 wt % PFSA loading have the best activity of unit PFSA. Supporting PFSA by a nanofibrous matrix enhances liquid holdups inside the catalysts and offers accessibility of the acid sites, and therefore improves the activity of the catalysts. Moreover, these catalysts allow recovery at high percentages and regeneration with high activity.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324783

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11341–11347

Titre :	Effect of reaction temperature and catalyst type on the formation of boron nitride nanotubes by chemical vapor deposition and measurement of their hydrogen storage capacity
Type de document :	texte imprimé
Auteurs :	Burcu Saner Okan, Auteur ; Zuleyha Ozlem Kocabas, Auteur ; Asli Nalbant Ergun, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11341–11347
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Catalyst Nanotubes
Résumé :	Boron nitride nanotubes (BNNT) were synthesized over both Fe3+ impregnated MCM-41 (mobil composition of matter no. 41) and Fe2O3/MCM-41 complex catalyst systems at relatively low temperatures for 1 h by the chemical vapor deposition technique in large quantities. The formation of BNNT was tailored at different reaction temperatures by changing catalyst type. The use of Fe3+-MCM-41 and Fe2O3 as a complex catalyst system led to thin and thick tube formations. The diameters of BNNTs were in the range of 2.5–4.0 nm for thin tubes and 20–60 nm for thick tubes. The thin tube formation originated from the growth of BNNT over Fe3+-MCM-41 due to its average pore size of 4 nm. Higher reaction temperatures caused both BNNT and iron-based side product formations. The hydrogen uptake capacity measurements by the Intelligent Gravimetric Analyzer at room temperature showed that BNNTs could adsorb 0.85 wt % hydrogen which was two times larger than that for commercial carbon nanotubes.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie301605z

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11335-11340

Titre :	Synthesis of methyl N - phenyl carbamate catalyzed by ionic liquid - promoted zinc acetate
Type de document :	texte imprimé
Auteurs :	Xinqiang Zhao, Auteur ; Lijuan Kang, Auteur ; Na Wang, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11335-11340
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Ionic liquid Catalytic reaction
Résumé :	A series of ionic liquid-promoted zinc acetate catalysts (Zn(OAc)2-ILs) were prepared by separately mixing anhydrous zinc acetate with one of some ionic liquids, and their catalytic performance for the synthesis of methyl N-phenyl carbamate (MPC) from aniline and dimethyl carbonate (DMC) was evaluated. Among the catalysts, Zn(OAc)2-[bmim]PF6 showed the best catalytic performance. Under the suitable reaction conditions, aniline conversion and MPC selectivity were 99.8% and 99.1%, respectively. Moreover, Zn(OAc)2-[bmim]PF6 could be used five times without a significant loss in its catalytic performance. The mechanism for the promotion of ionic liquid [bmim]PF6 on the catalytic performance of zinc acetate was investigated by means of FT-IR analysis. The results show that a hydrogen bond is formed between the carbonyl oxygen of zinc acetate and the C2-H on an imidazoiume ring of [bmim]PF6. As a result, the zinc acetate changes from a bidentate to a unidentate coordination structure. Simultaneously, this change promotes the coordination of the carbonyl oxygen in a DMC molecule with the zinc atom in the zinc acetate molecule, faciliting the attack of the nitrogen atom in an aniline molecule on the carbonyl carbon in the coordinated DMC molecule and then the formation of MPC.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324781

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11328-11334

Titre :	Conductometric performance of two - pole and five - ring conductivity cell probes for lanthanide determination using EDTA and DCTA as potential sequestering agents
Type de document :	texte imprimé
Auteurs :	Komal Matharu, Auteur ; Susheel K Mittal, Auteur ; S. K. Ashok Kumar, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11328-11334
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Conductometric Lanthanide
Résumé :	An improved conductometric titration method has been developed for the easy detection of lanthanides in the presence of interfering ions using a five-ring conductivity probe. These measurements were compared with those from a two-pole conductivity cell. Conductometric titrations of lanthanides with ethylenediaminetetraacetic acid (EDTA) and trans-1,2-diaminocyclohexanetetraacetic acid (DCTA) as complexing agents were successfully carried out in the presence of alkaline earth metal ions, transition metal ions, and other metal ions, such as Al3+ and Th4+, as interfering ions. The performance of the titrations of binary mixtures of Al(III) and lanthanides further improved and distinct end points corresponding to the stoichiometric ratio could be observed in mixed solvent media containing 1,4-dioxane (10―20%) which otherwise showed interference in aqueous media.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie301141g

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11312-11327

Titre :	A Meticulous study on the adsorption of mercury as tetrachloromercurate(II) anion with trioctylamine modified sodium montmorillonite and its application to a coal fly ash sample
Type de document :	texte imprimé
Auteurs :	A. Santhana Krishna Kumar, Auteur ; S. Kalidhasan, Auteur ; Vidya Rajesh, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11312-11327
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Fly ash Coal Montmorillonite Adsorption
Résumé :	Clay materials have hogged the limelight for their effectiveness in environmental remediation. In this paper, we report an effective solid phase extraction method for mercury based on the adsorption of tetrachloromercurate(II) anion with trioctylamine intercalated onto sodium montmorillonite. The adsorption is facile in acidic medium, and the adsorbent was well characterized by diverse physicochemical and spectroscopic techniques. Various isotherm models were employed to correlate the experimental adsorption data. The electrostatic interaction between HgCl42― and the protonated amine is well supported by a Langmuir isotherm model with a maximum adsorption capacity of 140.84 mg g―1. The ordered transition state that arises due to the proximity of the HgCl42― and the positively charged amine is accompanied by a decrease in the translational entropy of the system. The N2 adsorption-desorption isotherm study revealed the mesoporous nature of the adsorbent, and the thermodynamically favorable adsorption process resonates well with the ensuing negative free energy and enthalpy changes in accordance with the sorption mechanism. Packed bed column study demonstrated the scale up to 800 mL sample volume at 10 mg L―1 Hg(II) concentration, and the adsorbent could be regenerated and reused for 10 cycles with thiourea as the eluent. The removal of mercury from a coal fly ash sample validated the method.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=26324779

[article]
in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11301-11311

Titre :	The Combination of itaconic acid and sodium hypophosphite as a new cross - linking system for cotton
Type de document :	texte imprimé
Auteurs :	Huitao Peng, Auteur ; Charles Q. Yang, Auteur ; Xilie Wang, Auteur
Année de publication :	2012
Article en page(s) :	pp. 11301-11311
Note générale :	Industrial chemistry
Langues :	Anglais (eng)
Mots-clés :	Itaconic acid
Résumé :	In this research, we studied cross-linking of cotton fabrics using the combination of itaconic acid (ITA) and sodium hypophosphite (NaH2PO2). ITA, a bifunctional carboxylic acid, was able to esterify cotton cellulose to form a single ester linkage, but it was not able to form cross-linking between two cellulose molecules. In the presence of NaH2PO2, the amount of ester formed on cotton fabric was increased substantially and the esterification temperature of ITA was reduced. Therefore, NaH2PO2 functioned as a catalyst for esterification of cotton by ITA. Moreover, we found that wrinkle resistance of the cotton fabric was significantly improved when cotton fabrics were treated with the combination of ITA and NaH2PO2.We also found that phosphorus was bound to the treated cotton fabric and that the increase in the wrinkle recovery angle of the treated fabric was correlated to the increase in the amount of phosphorus bound to cotton. All the data indicated that H–P–H of sodium hypophosphite probably reacts with the >C═C< of two ITA molecules, which are also esterified with cellulose, thus forming a cross-linkage between the two cellulose molecules. The cotton fabrics treated with the ITA/NaH2PO2 system demonstrated a high level of durable press performance with significantly lower tensile strength loss than those treated with the formaldehyde-based dimethyloldihydroxyethyleneurea.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie3005644

Industrial & engineering chemistry research / Paul, Donald R. . Vol. 51 N° 35

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