Documents disponibles écrits par cet auteur

Application of a group contribution equation of state for the thermodynamic modeling of gas + ionic liquid mixtures / Maria Dolores Bermejo in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4966–4973 Titre : Application of a group contribution equation of state for the thermodynamic modeling of gas + ionic liquid mixtures Type de document : texte imprimé Auteurs : Maria Dolores Bermejo, Auteur ; David Méndez, Auteur ; Angel Martin, Auteur Année de publication : 2010 Article en page(s) : pp. 4966–4973 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  Ionic  Liquid Résumé : The group contribution equation of state (GC-EoS) is used to describe the phase behavior of gas + ionic liquid mixtures. With this equation, by application of the group contribution concept, if the parameters of the characteristic functional group of a family of ionic liquids are calculated using experimental data of a reduced number of ionic liquids of the family, then the phase behavior of all ionic liquids of the same family can be predicted. With this work, the parameter table of the GC-EoS is extended to systems that are comprised of an ionic liquid of the methylimidazolium bis[(trifluoromethyl)sulfonyl]imide family [−mim][Tf2N] and a gas (H2, CO, C2H4, O2, SO2, CH3OH, N2O, or Xe). Furthermore, a compilation of all GC-EoS parameters for gas + ionic liquid systems currently available in the literature is presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901989f [article] Application of a group contribution equation of state for the thermodynamic modeling of gas + ionic liquid mixtures [texte imprimé] / Maria Dolores Bermejo, Auteur ; David Méndez, Auteur ; Angel Martin, Auteur . - 2010 . - pp. 4966–4973. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4966–4973 Mots-clés : Gas  Ionic  Liquid Résumé : The group contribution equation of state (GC-EoS) is used to describe the phase behavior of gas + ionic liquid mixtures. With this equation, by application of the group contribution concept, if the parameters of the characteristic functional group of a family of ionic liquids are calculated using experimental data of a reduced number of ionic liquids of the family, then the phase behavior of all ionic liquids of the same family can be predicted. With this work, the parameter table of the GC-EoS is extended to systems that are comprised of an ionic liquid of the methylimidazolium bis[(trifluoromethyl)sulfonyl]imide family [−mim][Tf2N] and a gas (H2, CO, C2H4, O2, SO2, CH3OH, N2O, or Xe). Furthermore, a compilation of all GC-EoS parameters for gas + ionic liquid systems currently available in the literature is presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901989f

Co-precipitation of β-carotene and polyethylene glycol with compressed CO2 as an antisolvent / Facundo Mattea in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3900–3906 Titre : Co-precipitation of β-carotene and polyethylene glycol with compressed CO2 as an antisolvent : effect of temperature and concentration Type de document : texte imprimé Auteurs : Facundo Mattea, Auteur ; Angel Martin, Auteur ; Maria J. Cocero, Auteur Année de publication : 2008 Article en page(s) : p. 3900–3906 Note générale : Bibliogr. p. 3906 Langues : Anglais (eng) Mots-clés : β-carotene;  Polyethylene  glycol;  X-ray  diffraction;  Differential  scanning  calorimetry;  Scanning  electron  microscopy Résumé : In this work, the coprecipitation of β-carotene and polyethylene glycol (PEG) is studied. First, the effect of pressure and temperature was studied (pressures of 8−12 MPa, temperatures of 288−313 K), Afterward, the effect of the initial concentration of the different substances on the morphologies of the particles was studied. X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) analysis were used to observe the nature of the particles that were obtained. The results indicated the sensitivity of the precipitation to temperature, making impossible to obtain particles at temperatures above 288 K. With regard to the concentration effect on the morphology of the particles, it was possible to obtain different morphologies just by changing the concentration ratio between the substances. Also, the analysis of the coprecipitates indicated that the β-carotene inside the polymer matrix must be in an amorphous form. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071326k [article] Co-precipitation of β-carotene and polyethylene glycol with compressed CO2 as an antisolvent : effect of temperature and concentration [texte imprimé] / Facundo Mattea, Auteur ; Angel Martin, Auteur ; Maria J. Cocero, Auteur . - 2008 . - p. 3900–3906. Bibliogr. p. 3906 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3900–3906 Mots-clés : β-carotene;  Polyethylene  glycol;  X-ray  diffraction;  Differential  scanning  calorimetry;  Scanning  electron  microscopy Résumé : In this work, the coprecipitation of β-carotene and polyethylene glycol (PEG) is studied. First, the effect of pressure and temperature was studied (pressures of 8−12 MPa, temperatures of 288−313 K), Afterward, the effect of the initial concentration of the different substances on the morphologies of the particles was studied. X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) analysis were used to observe the nature of the particles that were obtained. The results indicated the sensitivity of the precipitation to temperature, making impossible to obtain particles at temperatures above 288 K. With regard to the concentration effect on the morphology of the particles, it was possible to obtain different morphologies just by changing the concentration ratio between the substances. Also, the analysis of the coprecipitates indicated that the β-carotene inside the polymer matrix must be in an amorphous form. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071326k

Design and cost evaluation of a separation process for a multicomponent mixture using dense CO2 / Laura Álvarez in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5779–5788 Titre : Design and cost evaluation of a separation process for a multicomponent mixture using dense CO2 Type de document : texte imprimé Auteurs : Laura Álvarez, Auteur ; Angel Martin, Auteur ; Germán Sanjuán, Auteur Année de publication : 2009 Article en page(s) : pp. 5779–5788 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Multicomponent  mixture  Dense  CO2  Enzymatic  reactor Résumé : Simulations done on the separation of a multicomponent mixture exiting an enzymatic reactor using dense CO2 as solvent are presented. The enzymatic reaction was carried out in the liquid phase although the CO2 was introduced in supercritical state (80 bar and 40 °C). The purpose was to obtain α-methylbenzyl acetate, a fruity and floral aroma used in the food and cosmetic industries, from the corresponding alcohol and acetic anhydride. The separation of the effluent, consisting of five components (two products, the nonconverted reactants, and the solvent) was done in a series of countercurrent extraction columns where, again, CO2 was used as solvent. It was introduced at relatively low pressure (20 bar) since higher values lead to solubilization of all the components. The influence of the S/F ratio, the feed inlet position, the column dimensions and the use of reflux was analyzed for the separation of the main product with a model available from literature. The diameter of the column was estimated to avoid flooding. Then, the flow sheet of the integrated reaction−separation process with CO2 recycling was presented and discussed. Using an pressure−enthalpy diagram, the energy costs were deduced. The fixed costs were also guessed from previous experience. Using both items, the economical evaluation of the process was performed for a 5-d operation corresponding to the annual production of the aroma. The analysis showed that the process could be feasible after a fine optimization of the enzyme lifetime and reaction efficiency since the downstream separation was inexpensive. In order to make the process effectively profitable, applications would have to be found for the rest of the year (e.g., on the synthesis of other esters). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801914q [article] Design and cost evaluation of a separation process for a multicomponent mixture using dense CO2 [texte imprimé] / Laura Álvarez, Auteur ; Angel Martin, Auteur ; Germán Sanjuán, Auteur . - 2009 . - pp. 5779–5788. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5779–5788 Mots-clés : Multicomponent  mixture  Dense  CO2  Enzymatic  reactor Résumé : Simulations done on the separation of a multicomponent mixture exiting an enzymatic reactor using dense CO2 as solvent are presented. The enzymatic reaction was carried out in the liquid phase although the CO2 was introduced in supercritical state (80 bar and 40 °C). The purpose was to obtain α-methylbenzyl acetate, a fruity and floral aroma used in the food and cosmetic industries, from the corresponding alcohol and acetic anhydride. The separation of the effluent, consisting of five components (two products, the nonconverted reactants, and the solvent) was done in a series of countercurrent extraction columns where, again, CO2 was used as solvent. It was introduced at relatively low pressure (20 bar) since higher values lead to solubilization of all the components. The influence of the S/F ratio, the feed inlet position, the column dimensions and the use of reflux was analyzed for the separation of the main product with a model available from literature. The diameter of the column was estimated to avoid flooding. Then, the flow sheet of the integrated reaction−separation process with CO2 recycling was presented and discussed. Using an pressure−enthalpy diagram, the energy costs were deduced. The fixed costs were also guessed from previous experience. Using both items, the economical evaluation of the process was performed for a 5-d operation corresponding to the annual production of the aroma. The analysis showed that the process could be feasible after a fine optimization of the enzyme lifetime and reaction efficiency since the downstream separation was inexpensive. In order to make the process effectively profitable, applications would have to be found for the rest of the year (e.g., on the synthesis of other esters). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801914q

Experimental performance and modeling of a new cooled-wall reactor for the supercritical water oxidation / M. Dolores Bermejo in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6262–6272 Titre : Experimental performance and modeling of a new cooled-wall reactor for the supercritical water oxidation Type de document : texte imprimé Auteurs : M. Dolores Bermejo, Auteur ; Daniel Rincon, Auteur ; Angel Martin, Auteur Année de publication : 2009 Article en page(s) : pp. 6262–6272 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cooled-wall  reactor  Supercritical  water  oxidation Résumé : For the commercial application of the supercritical water oxidation (SCWO), new reactors that are able to withstand the harsh operational conditions of the process must be developed. In this work, a new scaled-up design of the cooled-wall reactor (CWR) is presented, which isolates the temperature and pressure stresses caused by SCWO processes. The new reactor consists of a series of chambers designed as a heat exchanger to maximize the residence time and minimize the temperature gradient inside the reactor, allowing a better thermal protection of the pressure shell. This reactor has been implemented in a demonstration scale plant located in the industrial site of a waste management company. Experimental results obtained in this plant with five prototypes of the reactor are presented, explaining the strong and weak points of the designs and the modifications proposed to overcome the operational problems. Experimental results obtained working with oxygen and air as an oxidant and feeds containing isopropyl alcohol and mixtures of isopropyl alcohol/ammonia are thoroughly examined and compared. To have a better understanding of the behavior of the reactor a mathematical model specifically developed for the new reactor is presented. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900054e [article] Experimental performance and modeling of a new cooled-wall reactor for the supercritical water oxidation [texte imprimé] / M. Dolores Bermejo, Auteur ; Daniel Rincon, Auteur ; Angel Martin, Auteur . - 2009 . - pp. 6262–6272. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6262–6272 Mots-clés : Cooled-wall  reactor  Supercritical  water  oxidation Résumé : For the commercial application of the supercritical water oxidation (SCWO), new reactors that are able to withstand the harsh operational conditions of the process must be developed. In this work, a new scaled-up design of the cooled-wall reactor (CWR) is presented, which isolates the temperature and pressure stresses caused by SCWO processes. The new reactor consists of a series of chambers designed as a heat exchanger to maximize the residence time and minimize the temperature gradient inside the reactor, allowing a better thermal protection of the pressure shell. This reactor has been implemented in a demonstration scale plant located in the industrial site of a waste management company. Experimental results obtained in this plant with five prototypes of the reactor are presented, explaining the strong and weak points of the designs and the modifications proposed to overcome the operational problems. Experimental results obtained working with oxygen and air as an oxidant and feeds containing isopropyl alcohol and mixtures of isopropyl alcohol/ammonia are thoroughly examined and compared. To have a better understanding of the behavior of the reactor a mathematical model specifically developed for the new reactor is presented. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900054e