DEHYDRATION METHOD OF SOLUTION BY MEMBRANE

摘要

PROBLEM TO BE SOLVED: To provide a dehydration method from solution, having superior energy saving properties and high effectiveness, by effectively recovering heat from transmembrane vapor positively, and further effectively recovering heat from non-transmembrane vapor positively, thereby using the recovered heat for heating a supply stock solution.SOLUTION: A method is provided for removing moisture from a water solution by using a membrane module 5 having a separation membrane. The method includes at least: a heated water solution or heated vapor supply step of supplying the heated water solution obtained by heating the water solution or heated vapor from a primary side of the separation membrane to the separation membrane; a permeate recovery step of recovering the permeate from the separation membrane as vapor by sweeping a secondary side of the separation membrane with gas; a heat recovery step of recovering heat from the recovered transmembrane vapor; and a heat recovery step of recovering heat from the non-transmembrane vapor discharged out of the membrane module.