Effect of coagulant bath on the gas permeation properties of cellulose acetate asymmetric membrane

[摘要] Membrane based gas separation process technology has been recognized as one of the most efficient and advanced unit operation for gas separation. One of the problems in membrane gas separation is membrane performance. This paper explores the application of cellulose acetate (CA) membrane for natural gas purification and separation by improving its permeability and selectivity. The main interest in this research is to study the effect of quench medium on the gas separation performance towards its physical characteristics and gas separation performance of CA membrane. Cellulose acetate polymer was dissolved in n- methyl-2-pyrrolidone solvent and casted onto a glass plate using a pneumatically controlled casting system with fixed shear rate and solvent evaporation times. The parameter varied was the non-solvent used as quench medium during membrane post treatment that were methanol and n-hexane. The different quench media as post treatment affected the O2and N2gas permeation and O2/N2selectivity as well as the tensile strength of the flat sheet asymmetric membrane. Combination of methanol and n-hexane as quench media gave the best result than the other steps. This solvent exchange step influenced the morphology by producing thin skin layer and thus gives better gas separation performance than other steps.

[发布机构] Advanced Membrane Technology Research Centre (AMTEC), FPREE, Universiti Teknologi Malaysia, Johor, Johor Bahru; 81310, Malaysia^1;UTM-MPRC Institute for Oil and Gas, FPREE, Universiti Teknologi Malaysia, Johor, Johor Bahru; 81310, Malaysia^2;Faculty of Petroleum and Renewable Energy Engineering (FPREE), Universiti Teknologi Malaysia, Johor, Johor Bahru; 81310, Malaysia^3;Faculty Chemical Engineering, Universiti Teknologi Malaysia, Johor, Johor Bahru; 81310, Malaysia^4

[效力级别] 化学 [学科分类] 生物科学（综合）

[关键词] Asymmetric membranes;Cellulose acetate membrane;Gas permeation properties;Gas separation performance;Gas separation process;Membrane post-treatment;N-methyl-2-pyrrolidone;Physical characteristics