Permeation properties of CO2 and CH4 in asymmetric polyethersulfone/ polyesterurethane and polyethersulfone/polyetherurethane blend membranes  

作　　者：Shadi Hasanajili Masoud Latifzadeh Mahmoud Bahmani 

机构地区：[1]Chemical and Petroleum Engineering School, Shiraz University, 712,48-51154 Shiraz, lran

出　　处：《Chinese Journal of Chemical Engineering》2017年第12期1750-1759,共10页中国化学工程学报（英文版）

摘　　要：The transport performances of carbon dioxide and methane were studied in polyethersulfone, polyethersulfone/polyeterurethane(PES–ETPU) and polyethersulfone/polyestherurethane(PES–ESPU) blend membranes separately with different compositions. The variations in the structural characteristics of PES membrane after incorporation of ESPU and ETPU were investigated by different techniques. Additionally, the effect of pressure and composition on the permeance of CO_2, CH_4 and ideal selectivity of CO_2/CH_4 were checked on the membranes.The results revealed that the morphology of the blend membranes was affected by two opposite factors: thermodynamic enhancement and kinetic hindrance. The membranes with denser sponge layers were formed at lower ratio of PU/PES, while more porous structure with enlarged macrovoids membranes were observed at higher PU content. The results indicated that adding PU to PES membrane, caused permeance improvement of the gases with nearly no change and/or reduction in ideal selectivity of CO_2/CH_4. Moreover, PES–ETPU membranes showed higher permeability and less CO_2/CH_4 selectivity in comparison with PES–ESPU samples. For PES–ESPU membrane containing 1.5% ESPU, CO_2 permeance at 10 bar was improved up to 20% with almost no change in CO_2/CH_4 selectivity with respect to PES. Finally, response surface methodology was used to evaluate the effects of the operating parameters on the permeance and ideal selectivity.The transport performances of carbon dioxide and methane were studied in polyethersulfone, polyethersulfone/ polyeterurethane （PES-ETPU） and polyethersulfone/polyestherurethane （PES-ESPU） blend membranes separately with different compositions, The variations in the structural characteristics of PES membrane after incorporation of ESPU and ETPU were investigated by different techniques. Additionally, the effect of pressure and composition on the permeance of CO2, CH4 and ideal selectivity of CO2/CH4 were checked on the membranes. The results revealed that the morphology of the blend membranes was affected by two opposite factors： thermo- dynamic enhancement and kinetic hindrance. The membranes with denser sponge layers were formed at lower ratio of PU/PES, while more porous structure with enlarged macrovoids membranes were observed at higher PU content. The results indicated that adding PU to PES membrane, caused permeance improvement of the gases with nearly no change and/or reduction in ideal selectivity of CO2/CH4. Moreover, PES-ETPU membranes showed higher permeability and less CO2/CH4 selectivity in comparison with PES-ESPU samples, For PES-ESPU membrane containing 1,5% ESPU, CO2 permeance at 10 bar was improved up to 20% with almost no change in CO2/CH4 selectivity with respect to PES. Finally, response surface methodology was used to evaluate the effects of the operating parameters on the permeance and ideal selectivity.

关 键 词：Absorption Membranes Size distribution RSM Polyethersulfone Polyurethane 

分 类 号：TQ051.893[化学工程]