| 摘要 |
A method for concentrating a water-soluble organic material wherein a mixture of the water-soluble organic material with water is distilled in a distillation column ( 11 ), and the fraction from the top ( 11 a) of the distillation column ( 11 ) is separated by the use of a membrane separator ( 14 ) into a permeated vapor (F<SUB>2</SUB>) and a non-permeated vapor (F<SUB>3</SUB>), which comprises once condensing the fraction to form a condensate, heating the condensate in an evaporator ( 13 ) to generate a vapor (F<SUB>1</SUB>) having a pressure higher than the operation pressure for the distillation column ( 11 ), and introducing the vapor (F<SUB>1</SUB>) to the membrane separator ( 14 ), thereby separating water from the mixture.
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