Poly(amide-6-b-ethylene oxide) membranes for sour gas separation

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• 作者：Xiaoling Ren ; Jizhong Ren ; ^{renjizhong@dicp.ac.cn} ; Maicun Deng
• 关键词：Poly(amide-6-b-ethylene oxide) ; Sour gas separation ; Composite membrane
• 刊名：Separation and Purification Technology
• 出版年：2012
• 期刊代码：78_13835866
• 类别：ce
• 出版时间：22 March, 2012
• 卷：89
• 期：Complete
• 页码：1-8
• 文件大小：742 K

摘要

In this paper, poly(amide-6-b-ethylene oxide) (PEBA1657) copolymer was used to prepare polyetherimide (PEI)/PEBA1657 composite membranes and ultra thin multilayer PEI/polydimethylsilicone (PDMS)/PEBA1657/PDMS composite membranes by dip-coating method for sour gas capturing. The gas permeation and transport characteristics of sour gases (CO₂, H₂S, and SO₂) are investigated and analyzed. With the increase of transmembrane pressure difference, the permeation of H₂S, CO₂, and SO₂ is enhanced due to pressure-induced plasticization effect. The temperature dependency of H₂S permeance for PEI/PEBA1657 composite membranes changes from positive to negative when the transmembrane pressure difference increases from 3 to 7 atm. However, the SO₂ permeance of PEBA1657 composite membranes decreases dramatically with temperature increasing due to the reduction of SO₂ solubility. By analyzing the difference of transport characteristics between PEI/PEBA1657 and PEI/PDMS/PEBA1657/PDMS composite membranes, PEI/PEBA1657 composite membranes with high SO₂/N₂ selectivity are preferred for SO₂/N₂ separation; while the multilayer PEI/PDMS/PEBA1657/PDMS composite membranes, displaying high permeances for CO₂ and H₂S, are suitable for CO₂/N₂ and H₂S/N₂ separation.