アルコ-ル溶媒置換法による非対称型乾燥酢酸セルロ-ス膜の気体透過特性

概要

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Asymmetric cellulose acetate reverse osmosis membranes were vacuum dried at ambient temperature, after being soaked in alcohols such as methanol, ethanol (EtOH) and isopropanol (i-PrOH) to replace water in the membrane. The dried membrane was characterized by permeabilities of He, CH4, N2 and CO2, and separation factor of equi-molar mixture of CH4 and CO2. Shortening the evaporation time of acetone results in an increase of permeability. Dried membranes which were heat treated less than 80°C did not virtually permeate gases. Treatment by mixtures of EtOH and i-PrOH gives the best dried membranes among the tested; as for separation factor, mixing ratio of EtOH and i-PrOH as 1 : 3 gives the best; as for permeability, as 1 : 1.
日本膜学会の論文