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Carbon dioxide - selective membranes for high - pressure synthesis gas purification / He Bai in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12152-12161 Titre : Carbon dioxide - selective membranes for high - pressure synthesis gas purification Type de document : texte imprimé Auteurs : He Bai, Auteur ; W. S. Winston Ho, Auteur Année de publication : 2011 Article en page(s) : pp. 12152-12161 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas  purification  Synthesis  gas  Carbon  dioxide Résumé : The CO2-selective facilitated transport membranes baced on cross-linked poly(vinyl alcohol) (PVA) and sulfonated polybenzimidazole (SPBI) matrixes were synthesized and characterized for high-pressure synthesis gas purification. The cross-linked PVA-based membranes showed CO2/H2 selectivity higher than 30 and CO2 permeability as high as close to 1000 barrers for a membrane thickness of 15-30 μm at a feed pressure of 220 psia, which are desirable for the intended gas purification. The SPBI-based membranes generally showed lower separation performance because of their lower hydrophilicity. The cross-linked PVA-based membranes showed the best separation performance at 106 °C. However, the SPBI-1 copolymer-based membranes exhibited the best separation performance at 100 °C because of also their lower hydrophilicity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697532 [article] Carbon dioxide - selective membranes for high - pressure synthesis gas purification [texte imprimé] / He Bai, Auteur ; W. S. Winston Ho, Auteur . - 2011 . - pp. 12152-12161. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12152-12161 Mots-clés : Gas  purification  Synthesis  gas  Carbon  dioxide Résumé : The CO2-selective facilitated transport membranes baced on cross-linked poly(vinyl alcohol) (PVA) and sulfonated polybenzimidazole (SPBI) matrixes were synthesized and characterized for high-pressure synthesis gas purification. The cross-linked PVA-based membranes showed CO2/H2 selectivity higher than 30 and CO2 permeability as high as close to 1000 barrers for a membrane thickness of 15-30 μm at a feed pressure of 220 psia, which are desirable for the intended gas purification. The SPBI-based membranes generally showed lower separation performance because of their lower hydrophilicity. The cross-linked PVA-based membranes showed the best separation performance at 106 °C. However, the SPBI-1 copolymer-based membranes exhibited the best separation performance at 100 °C because of also their lower hydrophilicity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697532

Selective separation of cephalexin from multiple component mixtures / Michael E. Vilt 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. 12022–12030 Titre : Selective separation of cephalexin from multiple component mixtures Type de document : texte imprimé Auteurs : Michael E. Vilt, Auteur ; W. S. Winston Ho, Auteur Année de publication : 2011 Article en page(s) : pp. 12022–12030 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Cephalexin Résumé : Supported liquid membranes (SLMs) with strip dispersion and carrier, Aliquat 336, were used for the selective recovery of Cephalexin from simulated enzymatic solutions for Cephalexin synthesis. For the Cephalexin-containing feed solution, pH control methods using constant NaOH titration, carbonate buffer, and phosphate buffer were compared. Carbonate buffers with concentrations of 0.05 and 0.10 M gave the highest extraction and recovery, in which recovery for both cases was over 99%. Optimal extraction of Cephalexin from feed solutions containing equimolar concentrations of 7-amino-3-desacetoxicephalosporanic acid (7-ADCA) occurred at a feed solution pH = 9.5, resulting in a separation factor of 12.1. The recovery of Cephalexin from solutions containing 7-ADCA, phenylglycine amide (PGA), and phenylglycine (PG) was also demonstrated. Improved Cephalexin extraction was achieved at a feed pH = 8.0 when compared to a feed pH = 9.5 due to high coextraction of PG at the latter. At a feed pH = 8.0 and a feed solution composition of 15, 15, 15, and 3 mM for Cephalexin, 7-ADCA, PG, and PGA, respectively, an initial Cephalexin flux of 3.1 g/(m2 h) was achieved. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100073w [article] Selective separation of cephalexin from multiple component mixtures [texte imprimé] / Michael E. Vilt, Auteur ; W. S. Winston Ho, Auteur . - 2011 . - pp. 12022–12030. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12022–12030 Mots-clés : Cephalexin Résumé : Supported liquid membranes (SLMs) with strip dispersion and carrier, Aliquat 336, were used for the selective recovery of Cephalexin from simulated enzymatic solutions for Cephalexin synthesis. For the Cephalexin-containing feed solution, pH control methods using constant NaOH titration, carbonate buffer, and phosphate buffer were compared. Carbonate buffers with concentrations of 0.05 and 0.10 M gave the highest extraction and recovery, in which recovery for both cases was over 99%. Optimal extraction of Cephalexin from feed solutions containing equimolar concentrations of 7-amino-3-desacetoxicephalosporanic acid (7-ADCA) occurred at a feed solution pH = 9.5, resulting in a separation factor of 12.1. The recovery of Cephalexin from solutions containing 7-ADCA, phenylglycine amide (PGA), and phenylglycine (PG) was also demonstrated. Improved Cephalexin extraction was achieved at a feed pH = 8.0 when compared to a feed pH = 9.5 due to high coextraction of PG at the latter. At a feed pH = 8.0 and a feed solution composition of 15, 15, 15, and 3 mM for Cephalexin, 7-ADCA, PG, and PGA, respectively, an initial Cephalexin flux of 3.1 g/(m2 h) was achieved. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100073w