Documents disponibles écrits par cet auteur

Effect of hydrocarbons on the separation of carbon dioxide from methane through a polyimide gas separation membrane / Raza Hasan in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5415–5419 Titre : Effect of hydrocarbons on the separation of carbon dioxide from methane through a polyimide gas separation membrane Type de document : texte imprimé Auteurs : Raza Hasan, Auteur ; Colin A. Scholes, Auteur ; Geoff W. Stevens, Auteur Année de publication : 2009 Article en page(s) : pp. 5415–5419 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Membrane  gas  separation  Polymeric  membrane Résumé : The removal of carbon dioxide from natural gas by membrane gas separation is an important process in upgrading the gas for consumers. Hydrocarbons associated with natural gas have the potential to influence the CO2 separation performance of membranes. Here, a glassy polymeric membrane of poly (4,4′-hexafluoroisopropylidene diphthalic anhydride-2,3,5,6-tetramethyl-1,4-phenylenediamine) (6FDA-TMPDA) was exposed to hexane and toluene at different partial pressures in a 90% CH4−10% CO2 gas mixture. The permeability of CO2 and CH4, as well as the selectivity, declined over time as both hexane and toluene competitively sorbed into the membrane. The resulting behavior fit the dual-sorption model for polymeric membrane separation and indicated Langmuir affinity constants of 0.13 ± 0.03 atm−1 for methane, 240 ± 100 atm−1 for hexane, and 980 ± 500 atm−1 for toluene (fugacity basis). The kinetics of the permeability decline were faster than that of the permeability recovery after the hydrocarbon contaminant was removed which may indicate that desorption from the Langmuir voids is the rate controlling step. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801537g [article] Effect of hydrocarbons on the separation of carbon dioxide from methane through a polyimide gas separation membrane [texte imprimé] / Raza Hasan, Auteur ; Colin A. Scholes, Auteur ; Geoff W. Stevens, Auteur . - 2009 . - pp. 5415–5419. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5415–5419 Mots-clés : Carbon  dioxide  Membrane  gas  separation  Polymeric  membrane Résumé : The removal of carbon dioxide from natural gas by membrane gas separation is an important process in upgrading the gas for consumers. Hydrocarbons associated with natural gas have the potential to influence the CO2 separation performance of membranes. Here, a glassy polymeric membrane of poly (4,4′-hexafluoroisopropylidene diphthalic anhydride-2,3,5,6-tetramethyl-1,4-phenylenediamine) (6FDA-TMPDA) was exposed to hexane and toluene at different partial pressures in a 90% CH4−10% CO2 gas mixture. The permeability of CO2 and CH4, as well as the selectivity, declined over time as both hexane and toluene competitively sorbed into the membrane. The resulting behavior fit the dual-sorption model for polymeric membrane separation and indicated Langmuir affinity constants of 0.13 ± 0.03 atm−1 for methane, 240 ± 100 atm−1 for hexane, and 980 ± 500 atm−1 for toluene (fugacity basis). The kinetics of the permeability decline were faster than that of the permeability recovery after the hydrocarbon contaminant was removed which may indicate that desorption from the Langmuir voids is the rate controlling step. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801537g