Abstract
The asymmetic polyethersulfone (PES) membranes for gas separation were made by ordinary phase inversion method from casting solutions of PES (Supplied from Sumitomo Chemical, 200P) in dimethyle formamide (DMF). The membranes were vacuum dried at 0°C after being soaked in a mixture of 50 vol% ethylalcohol and 50 vol% isopropylalcohol. The dried membranes were characterized by permeabilities of pure gas (He, N2, CH4, CO2) and mixed gas (CO2 : CH4=1 : 1), and separation factor of mixed gas. Permeability decreases with the increase of casting temperature, evaporation time and PES concentration. Separation factor of gaseous mixture of CO2 and CH4 increases with the increase of PES concentration, with the increase of casting temperature, passing through maximum at 90°C, and with the increase of evaporation time, passing through maximum at 5 min.Membrane surface treatment by DMF using spin coater at 4000 r.p.m. did not increase separation factor and decrease permeability by 1/20-1/6000. Membrane surface treament by silicone using spin coater at 4000 r.p.m. decreased permeability by 1/3-1/200, but increased separation factor from 1.0 to 3-6, and in one case from 4 to 12.
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