Documents disponibles écrits par cet auteur

Adsorptive removal of saturated and unsaturated fatty acids using Ion - exchange resins / Ganesh L. Maddikeri in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6869–6876 Titre : Adsorptive removal of saturated and unsaturated fatty acids using Ion - exchange resins Type de document : texte imprimé Auteurs : Ganesh L. Maddikeri, Auteur ; Aniruddha B. Pandit, Auteur ; Parag R. Gogate, Auteur Année de publication : 2012 Article en page(s) : pp. 6869–6876 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Acids  Ion  exchange Résumé : One of the pretreatment approaches for decreasing the initial acid content of waste vegetable oil or nonedible oils with high initial free fatty acid content, with an objective of obtaining a suitable starting raw material for the production of biodiesel, is the adsorption of the free acids using ion-exchange resins. The present work deals with investigation of adsorption characteristics of saturated (stearic) and unsaturated (oleic) fatty acids on different ion exchange resins (polymeric strong (Indion 810) and weak (Indion 850 and Indion 860) anion exchange resins). The ion exchange resins contain tertiary or quaternary amino functional groups on the styrene-divinyl benzene copolymer matrix which can facilitate the adsorption of acids. Kinetic adsorption studies have been carried out initially to determine the contact time required to reach the adsorption equilibrium between fatty acid adsorbed on the resin and remaining fatty acid present in the oil. Equilibrium adsorption studies have been carried out at different temperatures viz. 293, 303, and 313 K. It has been observed that adsorption of saturated and unsaturated fatty acids increased with its concentration in the liquid at constant temperature and decreased with an increase in the temperature at constant concentration. Also, the adsorption equilibrium data have been found to be well described by the Freundlich type isotherm. The negative values of ΔG and ΔH showed that the adsorption of both saturated and unsaturated acids on the ion exchange resins was spontaneous and also exothermic. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3000562 [article] Adsorptive removal of saturated and unsaturated fatty acids using Ion - exchange resins [texte imprimé] / Ganesh L. Maddikeri, Auteur ; Aniruddha B. Pandit, Auteur ; Parag R. Gogate, Auteur . - 2012 . - pp. 6869–6876. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6869–6876 Mots-clés : Acids  Ion  exchange Résumé : One of the pretreatment approaches for decreasing the initial acid content of waste vegetable oil or nonedible oils with high initial free fatty acid content, with an objective of obtaining a suitable starting raw material for the production of biodiesel, is the adsorption of the free acids using ion-exchange resins. The present work deals with investigation of adsorption characteristics of saturated (stearic) and unsaturated (oleic) fatty acids on different ion exchange resins (polymeric strong (Indion 810) and weak (Indion 850 and Indion 860) anion exchange resins). The ion exchange resins contain tertiary or quaternary amino functional groups on the styrene-divinyl benzene copolymer matrix which can facilitate the adsorption of acids. Kinetic adsorption studies have been carried out initially to determine the contact time required to reach the adsorption equilibrium between fatty acid adsorbed on the resin and remaining fatty acid present in the oil. Equilibrium adsorption studies have been carried out at different temperatures viz. 293, 303, and 313 K. It has been observed that adsorption of saturated and unsaturated fatty acids increased with its concentration in the liquid at constant temperature and decreased with an increase in the temperature at constant concentration. Also, the adsorption equilibrium data have been found to be well described by the Freundlich type isotherm. The negative values of ΔG and ΔH showed that the adsorption of both saturated and unsaturated acids on the ion exchange resins was spontaneous and also exothermic. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3000562

Intensification approaches for biodiesel synthesis from waste cooking oil / Ganesh L. Maddikeri in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14610–14628 Titre : Intensification approaches for biodiesel synthesis from waste cooking oil : A review Type de document : texte imprimé Auteurs : Ganesh L. Maddikeri, Auteur ; Aniruddha B. Pandit, Auteur ; Parag R. Gogate, Auteur Année de publication : 2013 Article en page(s) : pp. 14610–14628 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Biodiesel Résumé : The use of biodiesel as an alternative fuel has become more attractive recently because of its environmental benefits such as nontoxicity and biodegradability. However, due to the unfavorable economics and other problems for design and operation of large scale reactors, commercialization of biodiesel has not been significantly effective. The specific challenges in the synthesis route based on transesterification include higher separation times, high operating cost, high energy consumption, and low production efficiency due to equilibrium limitations. The present work highlights the potential use of waste cooking oil as a cheap and economical feedstock discussing the advantages of the process and limitations for transesterification reaction. Improvements in the synthesis process based on the different pretreatment methods and process intensifying techniques are discussed with specific reference to transesterification of waste cooking oil. Different physical and chemical pretreatment methods required for the preparation of feedstock include filtration, drying, acidic esterification, adsorption, crystallization, and distillation for the removal of fatty acids and other contaminants. The critical review also highlights the different process intensification techniques such as cavitational reactors, microwave irradiation, microchannel reactor, oscillatory flow reactor, use of cosolvent, and supercritical transesterification process that can be used for biodiesel production process with an objective of enhancing the reaction rate, reduction in the molar ratio of alcohol to oil, and energy input by intensifying the transport processes and overcoming the equilibrium limitations. Guidelines for the selection of optimum operating parameters have also been given with comparative analysis of the different approaches of process intensification. Finally, some recommendations have been made for the possible research that needs to be done for successful commercialization of biodiesel synthesis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301675j [article] Intensification approaches for biodiesel synthesis from waste cooking oil : A review [texte imprimé] / Ganesh L. Maddikeri, Auteur ; Aniruddha B. Pandit, Auteur ; Parag R. Gogate, Auteur . - 2013 . - pp. 14610–14628. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14610–14628 Mots-clés : Biodiesel Résumé : The use of biodiesel as an alternative fuel has become more attractive recently because of its environmental benefits such as nontoxicity and biodegradability. However, due to the unfavorable economics and other problems for design and operation of large scale reactors, commercialization of biodiesel has not been significantly effective. The specific challenges in the synthesis route based on transesterification include higher separation times, high operating cost, high energy consumption, and low production efficiency due to equilibrium limitations. The present work highlights the potential use of waste cooking oil as a cheap and economical feedstock discussing the advantages of the process and limitations for transesterification reaction. Improvements in the synthesis process based on the different pretreatment methods and process intensifying techniques are discussed with specific reference to transesterification of waste cooking oil. Different physical and chemical pretreatment methods required for the preparation of feedstock include filtration, drying, acidic esterification, adsorption, crystallization, and distillation for the removal of fatty acids and other contaminants. The critical review also highlights the different process intensification techniques such as cavitational reactors, microwave irradiation, microchannel reactor, oscillatory flow reactor, use of cosolvent, and supercritical transesterification process that can be used for biodiesel production process with an objective of enhancing the reaction rate, reduction in the molar ratio of alcohol to oil, and energy input by intensifying the transport processes and overcoming the equilibrium limitations. Guidelines for the selection of optimum operating parameters have also been given with comparative analysis of the different approaches of process intensification. Finally, some recommendations have been made for the possible research that needs to be done for successful commercialization of biodiesel synthesis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301675j

Mechanistic investigations on sonophotocatalytic degradation of textile dyes with surface active solutes / Chilukoti Balaji in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11485–11494 Titre : Mechanistic investigations on sonophotocatalytic degradation of textile dyes with surface active solutes Type de document : texte imprimé Auteurs : Chilukoti Balaji, Auteur ; Vijayanand S. Moholkar, Auteur ; Aniruddha B. Pandit, Auteur Année de publication : 2011 Article en page(s) : pp. 11485–11494 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Sonophotocatalytic Résumé : In recent years, two advanced oxidation processes, namely, photocatalysis and sonolysis have been extensively investigated for the degradation of recalcitrant organic pollutants. Simultaneous application of these two techniques, known as sonophotocatalysis has been found to give synergistic enhancement in degradation under specific experimental conditions. The present study attempts to establish the physical mechanism of sonophotocatalytic process by finding the synergy between two techniques that gives enhancement in degradation. Transient collapse of cavitation bubbles gives rise to light emission (known as sonoluminescence), which could provide activation of the photocatalyst. To test this hypothesis, we have conducted experiments on the basis of known effects of surface active solutes on sonoluminescence. Three different textile dyes have been chosen as model pollutants. Experiments have been conducted in the presence of three different surface active solutes, namely, SDS, 2-propanol, and 1-butanol. The rate of degradation reduces drastically with the addition of surface active solutes. The reduction in the degradation process ranges from 5-fold (for Acid Red B) to 20% (for Direct Blue 6) for SDS, while for alcohols much higher ( 10-fold) reduction is seen for all three dyes. It is revealed that the interaction between photocatalyst and sonolysis is merely of physical nature. The sonoluminescence light from cavitation bubbles is not able to activate the photocatalyst. The role of TiO2 is revealed to be only that of an adsorbent for the dyes. The degradation is caused mostly due to the radicals generated by the cavitation bubble, with negligible role of the radical generation from photocatalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201127v [article] Mechanistic investigations on sonophotocatalytic degradation of textile dyes with surface active solutes [texte imprimé] / Chilukoti Balaji, Auteur ; Vijayanand S. Moholkar, Auteur ; Aniruddha B. Pandit, Auteur . - 2011 . - pp. 11485–11494. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11485–11494 Mots-clés : Sonophotocatalytic Résumé : In recent years, two advanced oxidation processes, namely, photocatalysis and sonolysis have been extensively investigated for the degradation of recalcitrant organic pollutants. Simultaneous application of these two techniques, known as sonophotocatalysis has been found to give synergistic enhancement in degradation under specific experimental conditions. The present study attempts to establish the physical mechanism of sonophotocatalytic process by finding the synergy between two techniques that gives enhancement in degradation. Transient collapse of cavitation bubbles gives rise to light emission (known as sonoluminescence), which could provide activation of the photocatalyst. To test this hypothesis, we have conducted experiments on the basis of known effects of surface active solutes on sonoluminescence. Three different textile dyes have been chosen as model pollutants. Experiments have been conducted in the presence of three different surface active solutes, namely, SDS, 2-propanol, and 1-butanol. The rate of degradation reduces drastically with the addition of surface active solutes. The reduction in the degradation process ranges from 5-fold (for Acid Red B) to 20% (for Direct Blue 6) for SDS, while for alcohols much higher ( 10-fold) reduction is seen for all three dyes. It is revealed that the interaction between photocatalyst and sonolysis is merely of physical nature. The sonoluminescence light from cavitation bubbles is not able to activate the photocatalyst. The role of TiO2 is revealed to be only that of an adsorbent for the dyes. The degradation is caused mostly due to the radicals generated by the cavitation bubble, with negligible role of the radical generation from photocatalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201127v

Petroleum residue upgradation via visbreaking / Jyeshtharaj B. Joshi in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 8960–8988 Titre : Petroleum residue upgradation via visbreaking : a review Type de document : texte imprimé Auteurs : Jyeshtharaj B. Joshi, Auteur ; Aniruddha B. Pandit, Auteur ; Rohit P. Kulkarni, Auteur Année de publication : 2009 Article en page(s) : p. 8960–8988 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Petroleum  residue  Upgradation  Visbreaking Résumé : World petroleum residue processing capacity has reached about 810 MMTPA. In the present petroleum refining scenario, the viability of a petroleum refinery strongly depends on the flexibility of processing heavy crudes and, in turn, heavy residues. Visbreaking is one of the major residue upgrading processes and constitutes about 33% of the total residue processing capacity. In the present communication, the published literature pertaining to the visbreaking process has been extensively analyzed and a state-of-the-art review has been written that includes the following: (i) the effect of feed properties on fuel oil stability; (ii) reaction pathways, mechanism, and kinetics; (iii) parametric sensitivity of the operating variables such as temperature, pressure, and residence time; (iv) different visbreaker designs, viz. coil visbreaker, coil-soaker visbreaker, soaker with internals, and high conversion soaker; (v) coking and fouling; (vi) estimation of design parameters, viz. gas holdup in high-pressure bubble column (soaker), gas holdup in sectionalized bubble column (soaker with internals), liquid-phase mixing and axial mixing in high-pressure bubble column, liquid-phase mixing and axial mixing in sectionalized bubble column, and weeping; and (vii) mathematical modeling of visbreaker, which mainly includes the coil and the soaker. An attempt has been made to get the aforementioned aspects together in a coherent manner so that the information is available at a glance and is expected to be useful to researchers and practicing refiners. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710871#afn1 [article] Petroleum residue upgradation via visbreaking : a review [texte imprimé] / Jyeshtharaj B. Joshi, Auteur ; Aniruddha B. Pandit, Auteur ; Rohit P. Kulkarni, Auteur . - 2009 . - p. 8960–8988. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 8960–8988 Mots-clés : Petroleum  residue  Upgradation  Visbreaking Résumé : World petroleum residue processing capacity has reached about 810 MMTPA. In the present petroleum refining scenario, the viability of a petroleum refinery strongly depends on the flexibility of processing heavy crudes and, in turn, heavy residues. Visbreaking is one of the major residue upgrading processes and constitutes about 33% of the total residue processing capacity. In the present communication, the published literature pertaining to the visbreaking process has been extensively analyzed and a state-of-the-art review has been written that includes the following: (i) the effect of feed properties on fuel oil stability; (ii) reaction pathways, mechanism, and kinetics; (iii) parametric sensitivity of the operating variables such as temperature, pressure, and residence time; (iv) different visbreaker designs, viz. coil visbreaker, coil-soaker visbreaker, soaker with internals, and high conversion soaker; (v) coking and fouling; (vi) estimation of design parameters, viz. gas holdup in high-pressure bubble column (soaker), gas holdup in sectionalized bubble column (soaker with internals), liquid-phase mixing and axial mixing in high-pressure bubble column, liquid-phase mixing and axial mixing in sectionalized bubble column, and weeping; and (vii) mathematical modeling of visbreaker, which mainly includes the coil and the soaker. An attempt has been made to get the aforementioned aspects together in a coherent manner so that the information is available at a glance and is expected to be useful to researchers and practicing refiners. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710871#afn1

Ultrasound-assisted synthesis of biodiesel from palm fatty acid distillate / Vishwanath G. Deshmane in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7923–7927 Titre : Ultrasound-assisted synthesis of biodiesel from palm fatty acid distillate Type de document : texte imprimé Auteurs : Vishwanath G. Deshmane, Auteur ; Parag R. Gogate, Auteur ; Aniruddha B. Pandit, Auteur Année de publication : 2009 Article en page(s) : pp. 7923–7927 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Palm  fatty  acid  distillate  Biodiesel  Ultrasonic  irradiations Résumé : The present work aims at exploiting palm fatty acid distillate as a starting raw material for synthesis of biodiesel with the aim of reducing the cost of production. Esterification of palm fatty acid distillate (PFAD) with methanol in the presence of concentrated H2SO4 as a catalyst has been investigated in the presence of ultrasonic irradiations at 22 kHz frequency and 120 W as supplied power dissipation. The effect of different operating parameters such as molar ratio of reactants, catalyst quantity, and operating temperature have been studied with the aim of process optimization. It has been observed that ultrasound significantly enhances the rate of reaction and also the extent of equilibrium conversion. A certain degree of conversion attributed to heterogeneity of the system, which adds to mass transfer resistances under conventional approach, appears to get eliminated due to ultrasound. Conversion levels of more than 90% have been observed with the use of ultrasound in about 150 min under ambient operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800981v [article] Ultrasound-assisted synthesis of biodiesel from palm fatty acid distillate [texte imprimé] / Vishwanath G. Deshmane, Auteur ; Parag R. Gogate, Auteur ; Aniruddha B. Pandit, Auteur . - 2009 . - pp. 7923–7927. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7923–7927 Mots-clés : Palm  fatty  acid  distillate  Biodiesel  Ultrasonic  irradiations Résumé : The present work aims at exploiting palm fatty acid distillate as a starting raw material for synthesis of biodiesel with the aim of reducing the cost of production. Esterification of palm fatty acid distillate (PFAD) with methanol in the presence of concentrated H2SO4 as a catalyst has been investigated in the presence of ultrasonic irradiations at 22 kHz frequency and 120 W as supplied power dissipation. The effect of different operating parameters such as molar ratio of reactants, catalyst quantity, and operating temperature have been studied with the aim of process optimization. It has been observed that ultrasound significantly enhances the rate of reaction and also the extent of equilibrium conversion. A certain degree of conversion attributed to heterogeneity of the system, which adds to mass transfer resistances under conventional approach, appears to get eliminated due to ultrasound. Conversion levels of more than 90% have been observed with the use of ultrasound in about 150 min under ambient operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800981v

Visbreaking studies in the presence of soaker internals / Rohit P. Kulkarni in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Permalink