| 摘要 |
PURPOSE:To separate an org. substance without swelling a gas separation membrane, by a method wherein an aqueous solution of an org. substance is evaporated by an evaporator to form a gaseous mixture of the vapor of the org. substance and steam and said mixture is separated by the steam permselective gas separation membrane. CONSTITUTION:An aqueous solution of an org. substance is introduced into an evaporator 1 from a raw material supply line A. The aqueous solution is evaporated in said evaporator 1 to form a gaseous mixture consisting of the vapor of the org. substance and steam and said mixture is again raised in temp. by an overheater 3 and regulated to predetermined pressure and temp. to be supplied to a gas separation membrane 4. The pressure on the primary side of said membrane is pref. set to about 760-5,000mmHg and the temp. on the same side thereof is pref. set to 70-150 deg.C and, by operating the gas separation membrane 4 under this high temp. and high pressure condition, the permeation amount of steam can be increased. The conc. solution of the org. substance generated on the primary side of the membrane is recovered from a take-out line C and the steam sucked on the secondary side of the membrane is condensed by a cooler 5 to be returned to the evaporator from a reduced pressure tank 6 through a return line F.
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