ZEOLITE SEPARATION MEMBRANE AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide a zeolite separation membrane having high pressure resistance for use, excellent separation performance which can be used as a reverse osmosis membrane and a nanometer filter membrane, and to provide its production method. SOLUTION: Zeolite seed crystals having the average grain size of 0.4 to 8 times the average pore diameter of a base body are deposited all over the surface of a porous base body. Then the base body is dipped in a source material soln. having 1000 to 10000ppm total concn. of Si and Al and 10000 to 60000ppm alkali ion concn., and then subjected to hydrothermal synthesis to form a dense zeolite crystal film of 0.5 to 30μm thickness. The obtd. zeolite separation membrane shows >=1.0MPa pressure resistance for use.