Effect of bore fluid composition on structure and performance of asymmetric polysulfone hollow fiber membrane contactor for CO₂ absorption

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• 作者：M. Rahbari-sisakht^a ; ^b ; A.F. Ismail^a ; ^b ; ^{afauzi@utm.my} ; ^{fauzi.ismail@gmail.com} ; T. Matsuura^c
• 关键词：Hollow fiber membrane contactor ; CO2 capture ; Bore fluid composition ; Polysulfone
• 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：88
• 期：Complete
• 页码：99-106
• 文件大小：1432 K

摘要

Porous asymmetric polysolfone (PSf) hollow fiber membranes were fabricated using wet spinning process. Glycerol (4 wt.%) was used as additive. Aqueous solutions of 1-methyl-2-pyrrolidone (NMP) with different composition (0, 50, 70 and 90 wt.%NMP) were used as bore fluid. Distilled water was used to preparing aqueous NMP solutions. Structure and performance of resulting membranes in measuring of surface porosity, pore size, critical water entry pressure (CEPw) and CO₂ absorption in hollow fiber membrane contactor were investigated. The cross-section, the inner skin layer and the inner surface of the membranes were examined via scanning electronic microscopy (SEM). Using distilled water as bore fluid provided the membrane structure with a finger-like macrovoids which extend from the inner and outer surfaces of the membranes to the middle of the hollow fiber wall. Other hollow fiber membranes formed with a finger-like structure near the other surface and a sponge-like structure with holes beneath, which resulted in a high CEPw and CO₂ absorption rate. In addition, since a mixture of distilled water and NMP was used as the neutral bore fluid, the membranes showed a skinless inner surface. Results of gas permeation tests showed with increasing NMP concentration in the bore fluid the N₂ permeance decrease significantly and the wetting resistance decrease slightly. CO₂ absorption by distilled water was conducted through the gas-liquid membrane contactors. By employing 90%NMP in the bore fluid, the PSf membrane showed a CO₂ flux of approximately 110%higher than the PSf membrane fabricated with distilled water as the internal coagulant at the absorbent velocity of 7.9 脳 10^鈭? m/s.