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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

In situ platinum recovery and color removal from organosilicon streams / He Bai in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16457–16466 Titre : In situ platinum recovery and color removal from organosilicon streams Type de document : texte imprimé Auteurs : He Bai, Auteur Année de publication : 2013 Article en page(s) : pp. 16457–16466 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Organosilicon  Streams Résumé : Resource limitations, increased demand, and the high cost of precious metals (e.g., platinum) have led to the focus on recovery of platinum from organosilicon hydrosilylation streams as a potentially important source of cost savings in the organosilicon industry. In this work, in situ fixed-bed adsorption technology is demonstrated to be an effective platinum recovery and product color removal process. With the in situ Pt recovery process and using a functionalized silica gel scavenging material, a Pt recovery greater than 90% can be obtained both from silane distillation heavy wastes (with initial Pt concentration of around 50 ppm) and from organosilicon products (with initial Pt concentration of around 5 ppm), with suitable temperature and residence time. Long-term bed volume (BV) experiments were also carried out, and very high BV operations of the corresponding streams could be achieved, still with reasonably high Pt recovery at the end of the long-term run, and a Pt loading of about 2% could be obtained on scavengers. In addition, after Pt removal, the organosilicon products showed much reduced color, which is preferable for industrial applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3020318 [article] In situ platinum recovery and color removal from organosilicon streams [texte imprimé] / He Bai, Auteur . - 2013 . - pp. 16457–16466. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16457–16466 Mots-clés : Organosilicon  Streams Résumé : Resource limitations, increased demand, and the high cost of precious metals (e.g., platinum) have led to the focus on recovery of platinum from organosilicon hydrosilylation streams as a potentially important source of cost savings in the organosilicon industry. In this work, in situ fixed-bed adsorption technology is demonstrated to be an effective platinum recovery and product color removal process. With the in situ Pt recovery process and using a functionalized silica gel scavenging material, a Pt recovery greater than 90% can be obtained both from silane distillation heavy wastes (with initial Pt concentration of around 50 ppm) and from organosilicon products (with initial Pt concentration of around 5 ppm), with suitable temperature and residence time. Long-term bed volume (BV) experiments were also carried out, and very high BV operations of the corresponding streams could be achieved, still with reasonably high Pt recovery at the end of the long-term run, and a Pt loading of about 2% could be obtained on scavengers. In addition, after Pt removal, the organosilicon products showed much reduced color, which is preferable for industrial applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3020318