Documents disponibles écrits par cet auteur

Entrainer based reactive distillation for esterification of ethylene glycol with acetic acid / Suman Thotla in Industrial & engineering chemistry research, Vol. 48 N° 21 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9461–9470 Titre : Entrainer based reactive distillation for esterification of ethylene glycol with acetic acid Type de document : texte imprimé Auteurs : Suman Thotla, Auteur ; Seethamraju Srinivas, Auteur ; Sanjay M. Mahajani, Auteur Année de publication : 2010 Article en page(s) : pp. 9461–9470 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Entrainer  Reactive  distillation  Acetic  acid Résumé : In this paper, we study the potential of entrainer in reactive distillation involving high boiling reactants to decrease the reactive stage temperature and for separation of one of the products to enhance the conversion. Esterification of ethylene glycol with acetic acid in the presence of Amberlyst 36 with 1,2-dichloro ethane (EDC), as an entrainer, is chosen as the model reaction. The effect of different parameters on selectivity of diacetate of ethylene glycol (DAEG) in entrainer based reactive distillation (EBRD) has been studied both through experiments and simulations. The results show that, by using entrainer, it is possible to obtain close to 100% selectivity toward diester even with a stoichiometric mole ratio, which is otherwise not possible in a conventional reactor. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801886q [article] Entrainer based reactive distillation for esterification of ethylene glycol with acetic acid [texte imprimé] / Suman Thotla, Auteur ; Seethamraju Srinivas, Auteur ; Sanjay M. Mahajani, Auteur . - 2010 . - pp. 9461–9470. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9461–9470 Mots-clés : Entrainer  Reactive  distillation  Acetic  acid Résumé : In this paper, we study the potential of entrainer in reactive distillation involving high boiling reactants to decrease the reactive stage temperature and for separation of one of the products to enhance the conversion. Esterification of ethylene glycol with acetic acid in the presence of Amberlyst 36 with 1,2-dichloro ethane (EDC), as an entrainer, is chosen as the model reaction. The effect of different parameters on selectivity of diacetate of ethylene glycol (DAEG) in entrainer based reactive distillation (EBRD) has been studied both through experiments and simulations. The results show that, by using entrainer, it is possible to obtain close to 100% selectivity toward diester even with a stoichiometric mole ratio, which is otherwise not possible in a conventional reactor. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801886q

Feasibility of reactive distillation for Fischer-Tropsch synthesis. 2 / Seethamraju Srinivas in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4710–4718 Titre : Feasibility of reactive distillation for Fischer-Tropsch synthesis. 2 Type de document : texte imprimé Auteurs : Seethamraju Srinivas, Auteur ; Ranjan K. Malik, Auteur ; Sanjay M. Mahajani, Auteur Année de publication : 2009 Article en page(s) : pp. 4710–4718 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Transportation  fuels  Fischer-Tropsch  Synthesis  technology  Reactive  distillation Résumé : The search for alternative sources of transportation fuels and energy security have revived an interest in the Fischer−Tropsch Synthesis (FTS) technology. Over the years, the main driver in FT reactor development has moved from the exothermic heat removal to the product distribution and selectivity. Reactive distillation (RD), a proven reactive separation method that can enhance yields and improve product selectivity in multiple reactant/product systems, was shown to be feasible for FTS in our earlier paper using a simplified kinetics [Srinivas, et al. Feasibility of Reactive distillation for Fischer−Tropsch Synthesis. Ind. Eng. Chem. Res. 2008, 48, 889−899]. This paper looks at the feasibility using a detailed kinetics incorporating olefin readsorption. In-built thermodynamic procedures of Aspen Plus, along with a detailed kinetic model that predicts product distribution, were used in performing the simulations. Some insight is given on the thermodynamics and kinetics used in performing the simulations. Conversion, yield, olefin-to-paraffin ratio, and product distribution are the parameters used for comparison among the different reactor types. Simulation results of the conventional reactors are compared with RD and it is seen that the performance of RD is at par or better than the conventional reactors. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801887m [article] Feasibility of reactive distillation for Fischer-Tropsch synthesis. 2 [texte imprimé] / Seethamraju Srinivas, Auteur ; Ranjan K. Malik, Auteur ; Sanjay M. Mahajani, Auteur . - 2009 . - pp. 4710–4718. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4710–4718 Mots-clés : Transportation  fuels  Fischer-Tropsch  Synthesis  technology  Reactive  distillation Résumé : The search for alternative sources of transportation fuels and energy security have revived an interest in the Fischer−Tropsch Synthesis (FTS) technology. Over the years, the main driver in FT reactor development has moved from the exothermic heat removal to the product distribution and selectivity. Reactive distillation (RD), a proven reactive separation method that can enhance yields and improve product selectivity in multiple reactant/product systems, was shown to be feasible for FTS in our earlier paper using a simplified kinetics [Srinivas, et al. Feasibility of Reactive distillation for Fischer−Tropsch Synthesis. Ind. Eng. Chem. Res. 2008, 48, 889−899]. This paper looks at the feasibility using a detailed kinetics incorporating olefin readsorption. In-built thermodynamic procedures of Aspen Plus, along with a detailed kinetic model that predicts product distribution, were used in performing the simulations. Some insight is given on the thermodynamics and kinetics used in performing the simulations. Conversion, yield, olefin-to-paraffin ratio, and product distribution are the parameters used for comparison among the different reactor types. Simulation results of the conventional reactors are compared with RD and it is seen that the performance of RD is at par or better than the conventional reactors. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801887m

Feasibility of reactive distillation for Fischer-Tropsch synthesis. 3. / Seethamraju Srinivas in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4719–4730 Titre : Feasibility of reactive distillation for Fischer-Tropsch synthesis. 3. Type de document : texte imprimé Auteurs : Seethamraju Srinivas, Auteur ; Ranjan K. Malik, Auteur ; Sanjay M. Mahajani, Auteur Année de publication : 2009 Article en page(s) : pp. 4719–4730 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Reactive  distillation  Multiple  reactant/product  systems  Fischer−Tropsch  Synthesis Résumé : Reactive distillation (RD), a proven reactive separation method that can enhance yields and improve product selectivity in multiple reactant/product systems, was shown to be feasible for FTS in our earlier papers using a simplified kinetics [Srinivas et al. Feasibility of Reactive Distillation for Fischer−Tropsch Synthesis. Ind. Eng. Chem. Res. 2008, 48, 889−899; DOI 10.1021/ie071094p] as well as a detailed kinetics [Srinivas et al. Feasibility of Reactive Distillation for Fischer−Tropsch Synthesis. 2. Ind. Eng. Chem. Res. 2009; DOI 10.1021/ie801887m]. In-built thermodynamic procedures of Aspen Plus, along with a detailed kinetic model that predicts product distribution, were used in performing the simulations. In this paper, we present detailed parametric studies like effect of reflux ratio, H2/CO feed ratio, number of nonreactive stages, etc. Conversion, yield, olefin-to-paraffin ratio and product distribution are the parameters used for comparison among the different cases studied. Within RD mode for FTS, some of the alternate column configurations like those with a side-heat removal and a side-draw, a hybrid column with reactive and nonreactive stages, are also explored and investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801888v [article] Feasibility of reactive distillation for Fischer-Tropsch synthesis. 3. [texte imprimé] / Seethamraju Srinivas, Auteur ; Ranjan K. Malik, Auteur ; Sanjay M. Mahajani, Auteur . - 2009 . - pp. 4719–4730. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4719–4730 Mots-clés : Reactive  distillation  Multiple  reactant/product  systems  Fischer−Tropsch  Synthesis Résumé : Reactive distillation (RD), a proven reactive separation method that can enhance yields and improve product selectivity in multiple reactant/product systems, was shown to be feasible for FTS in our earlier papers using a simplified kinetics [Srinivas et al. Feasibility of Reactive Distillation for Fischer−Tropsch Synthesis. Ind. Eng. Chem. Res. 2008, 48, 889−899; DOI 10.1021/ie071094p] as well as a detailed kinetics [Srinivas et al. Feasibility of Reactive Distillation for Fischer−Tropsch Synthesis. 2. Ind. Eng. Chem. Res. 2009; DOI 10.1021/ie801887m]. In-built thermodynamic procedures of Aspen Plus, along with a detailed kinetic model that predicts product distribution, were used in performing the simulations. In this paper, we present detailed parametric studies like effect of reflux ratio, H2/CO feed ratio, number of nonreactive stages, etc. Conversion, yield, olefin-to-paraffin ratio and product distribution are the parameters used for comparison among the different cases studied. Within RD mode for FTS, some of the alternate column configurations like those with a side-heat removal and a side-draw, a hybrid column with reactive and nonreactive stages, are also explored and investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801888v

Reactive distillation for fischer − tropsch synthesis / Seethamraju Srinivas in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9673–9692 Titre : Reactive distillation for fischer − tropsch synthesis : Simulation - based design methodology using aspen plus Type de document : texte imprimé Auteurs : Seethamraju Srinivas, Auteur ; Sanjay M. Mahajani, Auteur ; Ranjan K. Malik, Auteur Année de publication : 2011 Article en page(s) : pp. 9673–9692 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Simulations  Reactive  distillation Résumé : In a series of earlier papers, it has been shown through simulations in Aspen Plus that reactive distillation (RD) is feasible for Fischer−Tropsch Synthesis (FTS) [Srinivas et al., Ind. Eng. Chem. Res. 2009, 48, 4710−4718]. The flexibility offered by changing parameters such as reflux ratio, etc. has also been investigated through parametric studies [Srinivas et al., Ind. Eng. Chem. Res. 2009, 48, 4719−4730]. As an extension of the previous works, a methodology is now proposed to design a RD column for FTS in Aspen Plus, utilizing the kinetic and thermodynamic models reported previously. Slurry reactor simulations are performed initially to form a design basis and a simple RD column is configured. This is followed by catalyst redistribution, addition of coolers, nonreactive stages, and side draws. The methodology is illustrated step-by-step for three examples in a systematic manner. The possibility of multiple designs, expected difficulties in execution, and limitations of the algorithm are discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100108p [article] Reactive distillation for fischer − tropsch synthesis : Simulation - based design methodology using aspen plus [texte imprimé] / Seethamraju Srinivas, Auteur ; Sanjay M. Mahajani, Auteur ; Ranjan K. Malik, Auteur . - 2011 . - pp. 9673–9692. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9673–9692 Mots-clés : Simulations  Reactive  distillation Résumé : In a series of earlier papers, it has been shown through simulations in Aspen Plus that reactive distillation (RD) is feasible for Fischer−Tropsch Synthesis (FTS) [Srinivas et al., Ind. Eng. Chem. Res. 2009, 48, 4710−4718]. The flexibility offered by changing parameters such as reflux ratio, etc. has also been investigated through parametric studies [Srinivas et al., Ind. Eng. Chem. Res. 2009, 48, 4719−4730]. As an extension of the previous works, a methodology is now proposed to design a RD column for FTS in Aspen Plus, utilizing the kinetic and thermodynamic models reported previously. Slurry reactor simulations are performed initially to form a design basis and a simple RD column is configured. This is followed by catalyst redistribution, addition of coolers, nonreactive stages, and side draws. The methodology is illustrated step-by-step for three examples in a systematic manner. The possibility of multiple designs, expected difficulties in execution, and limitations of the algorithm are discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100108p

Reactive distillation for fischer - tropsch synthesis / Seethamraju Srinivas in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6350–6361 Titre : Reactive distillation for fischer - tropsch synthesis : feasible solution space Type de document : texte imprimé Auteurs : Seethamraju Srinivas, Auteur ; Sanjay M. Mahajani, Auteur ; Ranjan K. Malik, Auteur Année de publication : 2010 Article en page(s) : pp. 6350–6361 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reactive  Distillation Résumé : Fischer−Tropsch synthesis can be advantageously carried out in reactive distillation (RD) mode. Parametric studies like the effect of reflux ratio, pressure, etc. have been reported in our earlier work [Srinivas et al. Ind. Eng. Chem. Res. 2009, 48, 4719−4730] using Aspen Plus. As an extension of this work, multiparameter sensitivity analysis is performed on a simple RD configuration without side-draws or side-coolers in Aspen Plus, retaining the kinetic and thermodynamic models used previously. A feasible solution space in terms of reflux ratio, pressure, and total catalyst loading is identified and possible reasons for the bounds observed are provided. Changes in the column configuration toward various objectives like maximum conversion, maximum gasoline yield, or selectivity, etc. are also investigated. Regions of interest corresponding to different objectives are represented on a Da−reflux ratio plot. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100106u?journalCode=iecred [article] Reactive distillation for fischer - tropsch synthesis : feasible solution space [texte imprimé] / Seethamraju Srinivas, Auteur ; Sanjay M. Mahajani, Auteur ; Ranjan K. Malik, Auteur . - 2010 . - pp. 6350–6361. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6350–6361 Mots-clés : Reactive  Distillation Résumé : Fischer−Tropsch synthesis can be advantageously carried out in reactive distillation (RD) mode. Parametric studies like the effect of reflux ratio, pressure, etc. have been reported in our earlier work [Srinivas et al. Ind. Eng. Chem. Res. 2009, 48, 4719−4730] using Aspen Plus. As an extension of this work, multiparameter sensitivity analysis is performed on a simple RD configuration without side-draws or side-coolers in Aspen Plus, retaining the kinetic and thermodynamic models used previously. A feasible solution space in terms of reflux ratio, pressure, and total catalyst loading is identified and possible reasons for the bounds observed are provided. Changes in the column configuration toward various objectives like maximum conversion, maximum gasoline yield, or selectivity, etc. are also investigated. Regions of interest corresponding to different objectives are represented on a Da−reflux ratio plot. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100106u?journalCode=iecred