SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2017, Vol. 25 ›› Issue (12): 1750-1759.DOI: 10.1016/j.cjche.2017.07.011

• 第25届中国过程控制会议专栏 • 上一篇    下一篇

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

Shadi Hasanajili, Masoud Latifzadeh, Mahmoud Bahmani   

  1. Chemical and Petroleum Engineering School, Shiraz University, 71348-51154 Shiraz, Iran
  • 收稿日期:2016-11-12 修回日期:2017-03-27 出版日期:2017-12-28 发布日期:2018-01-18
  • 通讯作者: Shadi Hasanajili,Fax:+98 7136474619.E-mail address:ajili@shirazu.ac.ir.

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

Shadi Hasanajili, Masoud Latifzadeh, Mahmoud Bahmani   

  1. Chemical and Petroleum Engineering School, Shiraz University, 71348-51154 Shiraz, Iran
  • Received:2016-11-12 Revised:2017-03-27 Online:2017-12-28 Published:2018-01-18
  • Contact: Shadi Hasanajili,Fax:+98 7136474619.E-mail address:ajili@shirazu.ac.ir.

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 CO2, CH4 and ideal selectivity of CO2/CH4 were checked on the membranes. The results revealed that themorphology of the blendmembraneswas affected by two opposite factors: thermodynamic enhancement and kinetic hindrance. The membranes with denser sponge layers were formed at lower ratio of PU/PES,whilemore porous structure with enlarged macrovoids membraneswere 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

Abstract: 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 themorphology of the blendmembraneswas affected by two opposite factors: thermodynamic enhancement and kinetic hindrance. The membranes with denser sponge layers were formed at lower ratio of PU/PES,whilemore porous structure with enlarged macrovoids membraneswere 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.

Key words: Absorption, Membranes, Size distribution, RSM, Polyethersulfone, Polyurethane