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Aminosilane - functionalized cellulosic polymer for increased carbon dioxide sorption / Diana M. Pacheco in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 503-514 Titre : Aminosilane - functionalized cellulosic polymer for increased carbon dioxide sorption Type de document : texte imprimé Auteurs : Diana M. Pacheco, Auteur ; J.R. Johnson, Auteur ; William J. Koros, Auteur Année de publication : 2012 Article en page(s) : pp. 503-514 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Sorption  Carbon  dioxide Résumé : Improvement in the efficiency of CO2 separation from flue gases is a high-priority research area to reduce the total energy cost of carbon capture and sequestration technologies in coal-fired power plants. Efficient CO2 removal from flue gases by adsorption systems requires the design of novel sorbents capable of capturing, concentrating, and recovering CO2 on a cost-effective basis. This paper describes the preparation ofan aminosilane-functionalized cellulosic polymer sorbent with enhanced CO2 sorption capacity and promising performance for use in postcombustion carbon capture via rapid temperature-swing adsorption systems. The introduction of aminosilane functionalities onto the backbone of cellulose acetate was achieved by the anhydrous gafting of N-(2-aminoethyl)-3-aminoisobutyldimethylmethoxysilane. The dry sorption capacity of the modified cellulosic polymer reached 27 cc (STP) CO2/cc sorbent (1.01 mmol/g sorbent) at 1 atm and 39 cc (STP) CO2/cc sorbent (1.46 mmol/g sorbent) at 5 atm and 308 K. The amine loading achieved was 5.18 mmol amine(nitrogen)/g sorbent. Exposure to water vapor after the first dry sorption cycle increased the dry sorption capacity of the sorbent by 12% at 1 atm, suggesting its potential for rapid cyclic adsorption processes under humid feed conditions. The CO2 sorbent was characterized in terms of chemical composition, density changes, molecular structure, thermal stability, and surface morphology. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476495 [article] Aminosilane - functionalized cellulosic polymer for increased carbon dioxide sorption [texte imprimé] / Diana M. Pacheco, Auteur ; J.R. Johnson, Auteur ; William J. Koros, Auteur . - 2012 . - pp. 503-514. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 503-514 Mots-clés : Sorption  Carbon  dioxide Résumé : Improvement in the efficiency of CO2 separation from flue gases is a high-priority research area to reduce the total energy cost of carbon capture and sequestration technologies in coal-fired power plants. Efficient CO2 removal from flue gases by adsorption systems requires the design of novel sorbents capable of capturing, concentrating, and recovering CO2 on a cost-effective basis. This paper describes the preparation ofan aminosilane-functionalized cellulosic polymer sorbent with enhanced CO2 sorption capacity and promising performance for use in postcombustion carbon capture via rapid temperature-swing adsorption systems. The introduction of aminosilane functionalities onto the backbone of cellulose acetate was achieved by the anhydrous gafting of N-(2-aminoethyl)-3-aminoisobutyldimethylmethoxysilane. The dry sorption capacity of the modified cellulosic polymer reached 27 cc (STP) CO2/cc sorbent (1.01 mmol/g sorbent) at 1 atm and 39 cc (STP) CO2/cc sorbent (1.46 mmol/g sorbent) at 5 atm and 308 K. The amine loading achieved was 5.18 mmol amine(nitrogen)/g sorbent. Exposure to water vapor after the first dry sorption cycle increased the dry sorption capacity of the sorbent by 12% at 1 atm, suggesting its potential for rapid cyclic adsorption processes under humid feed conditions. The CO2 sorbent was characterized in terms of chemical composition, density changes, molecular structure, thermal stability, and surface morphology. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476495

Asymmetric hollow fiber membranes for separation of CO2 from hydrocarbons and fluorocarbons at high-pressure conditions relevant to C2F4 polymerization / Madhava R. Kosuri in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10577–10583 Titre : Asymmetric hollow fiber membranes for separation of CO2 from hydrocarbons and fluorocarbons at high-pressure conditions relevant to C2F4 polymerization Type de document : texte imprimé Auteurs : Madhava R. Kosuri, Auteur ; William J. Koros, Auteur Année de publication : 2010 Article en page(s) : pp. 10577–10583 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Asymmetric--Hollow  Fiber--Membranes--Separation--CO2--Hydrocarbons  --Fluorocarbons--High-Pressure--Conditions--Relevant--C2F4--Polymerization Résumé : Separation of high-pressure carbon dioxide from fluorocarbons is important for the production of fluoropolymers such as poly(tetrafluoroethylene). Typical polymeric membranes plasticize under high CO2 partial pressure conditions and fail to provide adequate selective separations. Torlon, a polyamide−imide polymer, with the ability to form interchain hydrogen bonding, is shown to provide stability against aggressive CO2 plasticization. Torlon membranes in the form of asymmetric hollow fibers (the most productive form of membranes) are considered for an intended separation of CO2/C2F4. To avoid safety issues with tetrafluoroethylene (C2F4), which could detonate under testing conditions, safer surrogate mixtures (C2H2F2 and C2H4) are considered in this paper. Permeation measurements (at 35 °C) indicate that the Torlon membranes are not plasticized even up to 1250 psi of CO2. The membranes provide mixed gas CO2/C2H2F2 and CO2/C2H4 selectivities of 100 and 30, respectively, at 1250 psi partial pressures of CO2. On the basis of the measured separation performances of CO2/C2H2F2 and CO2/C2H4 mixtures, the selectivity of the CO2/C2F4 mixture is expected to be greater than 100. Long-term stability studies indicate that the membranes provide stable separations over a period of 5 days at 1250 psi partial pressures of CO2, thereby making the membrane approach attractive. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900803z [article] Asymmetric hollow fiber membranes for separation of CO2 from hydrocarbons and fluorocarbons at high-pressure conditions relevant to C2F4 polymerization [texte imprimé] / Madhava R. Kosuri, Auteur ; William J. Koros, Auteur . - 2010 . - pp. 10577–10583. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10577–10583 Mots-clés : Asymmetric--Hollow  Fiber--Membranes--Separation--CO2--Hydrocarbons  --Fluorocarbons--High-Pressure--Conditions--Relevant--C2F4--Polymerization Résumé : Separation of high-pressure carbon dioxide from fluorocarbons is important for the production of fluoropolymers such as poly(tetrafluoroethylene). Typical polymeric membranes plasticize under high CO2 partial pressure conditions and fail to provide adequate selective separations. Torlon, a polyamide−imide polymer, with the ability to form interchain hydrogen bonding, is shown to provide stability against aggressive CO2 plasticization. Torlon membranes in the form of asymmetric hollow fibers (the most productive form of membranes) are considered for an intended separation of CO2/C2F4. To avoid safety issues with tetrafluoroethylene (C2F4), which could detonate under testing conditions, safer surrogate mixtures (C2H2F2 and C2H4) are considered in this paper. Permeation measurements (at 35 °C) indicate that the Torlon membranes are not plasticized even up to 1250 psi of CO2. The membranes provide mixed gas CO2/C2H2F2 and CO2/C2H4 selectivities of 100 and 30, respectively, at 1250 psi partial pressures of CO2. On the basis of the measured separation performances of CO2/C2H2F2 and CO2/C2H4 mixtures, the selectivity of the CO2/C2F4 mixture is expected to be greater than 100. Long-term stability studies indicate that the membranes provide stable separations over a period of 5 days at 1250 psi partial pressures of CO2, thereby making the membrane approach attractive. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900803z

Enabling low - cost CO2 capture via heat integration / Ryan P. Lively in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7550–7562 Titre : Enabling low - cost CO2 capture via heat integration Type de document : texte imprimé Auteurs : Ryan P. Lively, Auteur ; Ronald R. Chance, Auteur ; William J. Koros, Auteur Année de publication : 2010 Article en page(s) : pp. 7550–7562 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Heat  Integration Résumé : Hollow fiber sorbents in rapid thermal swing mode, packed bed solid sorbents in thermal swing mode, hollow fiber membranes, monoethanolamine-based liquid amines, and chilled ammonia CO2 sorption systems are compared on an energetic basis for CO2 capture from coal-fired power plants. The systems are compared on an intrinsic heat and auxiliary basis both with and without plantwide heat integration efforts. Without heat integration, every technology considered was shown to be highly parasitic, consuming between 1.0 and 4.0 GJ/(ton of CO2 captured) (effectively between 40 and 100% parasitic, depending on plant efficiencies). When heat integration strategies are considered, such as utilizing feedwater preheating heat flows (without disrupting plant operation) and utilizing heats generated during CO2 compression, the overall parasitic nature of the technologies decreases dramatically. Namely, chilled ammonia and zeolite MFI-based fiber sorbents consume approximately 0.07 and 0.13 GJ/(ton of CO2 captured), respectively. The overall energetic analysis strongly suggests that CO2 capture systems must be highly integrated with the plant systems for successful widespread deployment as retrofits to large power plants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100806g [article] Enabling low - cost CO2 capture via heat integration [texte imprimé] / Ryan P. Lively, Auteur ; Ronald R. Chance, Auteur ; William J. Koros, Auteur . - 2010 . - pp. 7550–7562. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7550–7562 Mots-clés : Heat  Integration Résumé : Hollow fiber sorbents in rapid thermal swing mode, packed bed solid sorbents in thermal swing mode, hollow fiber membranes, monoethanolamine-based liquid amines, and chilled ammonia CO2 sorption systems are compared on an energetic basis for CO2 capture from coal-fired power plants. The systems are compared on an intrinsic heat and auxiliary basis both with and without plantwide heat integration efforts. Without heat integration, every technology considered was shown to be highly parasitic, consuming between 1.0 and 4.0 GJ/(ton of CO2 captured) (effectively between 40 and 100% parasitic, depending on plant efficiencies). When heat integration strategies are considered, such as utilizing feedwater preheating heat flows (without disrupting plant operation) and utilizing heats generated during CO2 compression, the overall parasitic nature of the technologies decreases dramatically. Namely, chilled ammonia and zeolite MFI-based fiber sorbents consume approximately 0.07 and 0.13 GJ/(ton of CO2 captured), respectively. The overall energetic analysis strongly suggests that CO2 capture systems must be highly integrated with the plant systems for successful widespread deployment as retrofits to large power plants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100806g

Gas - transport - property performance of hybrid carbon molecular sieve − polymer materials / Mita Das in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9310–9321 Titre : Gas - transport - property performance of hybrid carbon molecular sieve − polymer materials Type de document : texte imprimé Auteurs : Mita Das, Auteur ; John D. Perry, Auteur ; William J. Koros, Auteur Année de publication : 2010 Article en page(s) : pp. 9310–9321 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas  Hybrid  Polymer Résumé : High-performance hybrid materials using carbon molecular sieve materials and 6FDA−6FpDA were produced. A detailed analysis of the effects of casting processes and the annealing temperature is reported. Two existing major obstacles, sieve agglomeration and residual stress, were addressed in this work, and subsequently a new membrane formation technique was developed to produce high-performing membranes. The successfully improved interfacial region of the hybrid membranes allows the sieves to increase the selectivity of the membranes above the neat polymer properties. Furthermore, an additional performance enhancement was seen with increased sieve loading in the hybrid membranes, leading to an actual performance above the upper bound for pure polymer membranes. The membranes were also tested under a mixed-gas environment, which further demonstrated promising results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100843r [article] Gas - transport - property performance of hybrid carbon molecular sieve − polymer materials [texte imprimé] / Mita Das, Auteur ; John D. Perry, Auteur ; William J. Koros, Auteur . - 2010 . - pp. 9310–9321. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9310–9321 Mots-clés : Gas  Hybrid  Polymer Résumé : High-performance hybrid materials using carbon molecular sieve materials and 6FDA−6FpDA were produced. A detailed analysis of the effects of casting processes and the annealing temperature is reported. Two existing major obstacles, sieve agglomeration and residual stress, were addressed in this work, and subsequently a new membrane formation technique was developed to produce high-performing membranes. The successfully improved interfacial region of the hybrid membranes allows the sieves to increase the selectivity of the membranes above the neat polymer properties. Furthermore, an additional performance enhancement was seen with increased sieve loading in the hybrid membranes, leading to an actual performance above the upper bound for pure polymer membranes. The membranes were also tested under a mixed-gas environment, which further demonstrated promising results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100843r

Hollow Fiber Sorbents for Desulfurization of Natural Gas / Dhaval A. Bhandari in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp.12038–12050 Titre : Hollow Fiber Sorbents for Desulfurization of Natural Gas Type de document : texte imprimé Auteurs : Dhaval A. Bhandari, Auteur ; Naoki Bessho, Auteur ; William J. Koros, Auteur Année de publication : 2011 Article en page(s) : pp.12038–12050 Note générale : Chimie industrielle Langues : Anglais (eng) Résumé : Pipeline natural gas is the primary fuel of choice for distributed fuel cell-based applications due to its well-developed infrastructure. The concentration of sulfur in odorized pipeline natural gas is about 30 ppm, with the acceptable level being <1 ppm for catalyst stability in such applications. Packed bed technology for desulfurization suffers from several disadvantages including high pressure drop and slow regeneration rates that require large unit sizes. This paper describes a new sorption platform utilizing hollow fibers with polymer “binder”, impregnated with high loadings of sulfur selective zeolite sorbent “fillers”. Temperature Swing Adsorption (TSA) can be utilized to thermally cycle the sorbents between sorption and regeneration cycles. A simplified flow pattern minimizes pressure drop, while a porous core morphology maximizes sorption efficiencies and high surface area to volume ratio structures can enable smaller bed sizes. This new technology represents a fusion of membrane science and adsorption technology. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100157w [article] Hollow Fiber Sorbents for Desulfurization of Natural Gas [texte imprimé] / Dhaval A. Bhandari, Auteur ; Naoki Bessho, Auteur ; William J. Koros, Auteur . - 2011 . - pp.12038–12050. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp.12038–12050 Résumé : Pipeline natural gas is the primary fuel of choice for distributed fuel cell-based applications due to its well-developed infrastructure. The concentration of sulfur in odorized pipeline natural gas is about 30 ppm, with the acceptable level being <1 ppm for catalyst stability in such applications. Packed bed technology for desulfurization suffers from several disadvantages including high pressure drop and slow regeneration rates that require large unit sizes. This paper describes a new sorption platform utilizing hollow fibers with polymer “binder”, impregnated with high loadings of sulfur selective zeolite sorbent “fillers”. Temperature Swing Adsorption (TSA) can be utilized to thermally cycle the sorbents between sorption and regeneration cycles. A simplified flow pattern minimizes pressure drop, while a porous core morphology maximizes sorption efficiencies and high surface area to volume ratio structures can enable smaller bed sizes. This new technology represents a fusion of membrane science and adsorption technology. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100157w

Membrane-Mediated Delivery of Carbon Dioxide for Consumption by Photoautotrophs / James D. Noel in Industrial & engineering chemistry research, Vol. 51 N° 12 (Mars 2012) 

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