PREPARATION OF INORGANIC COMPOSITE MEMBRANES BY USING A FAST FREEZING-FAST DRYING PROCESS

摘要

A method of preparing an inorganic composite membrane with high permeability in an easier manner as compared with conventional methods by using a rapid cooling-rapid drying process is provided. A method of preparing an inorganic composite membrane comprises: coating a planar or tubular porous inorganic support selected from porous metal, metal oxides and nonmetal oxides with a colloidal solution into which particles are dispersed; and rapidly cooling the coated support at a cooling rate ranging from 100 to 1000 deg.C/min in a temperature range of -250 to 0 deg.C for 0.01 to 10 minutes, rapidly drying the rapidly cooled support at a temperature rising rate ranging from 100 to 1200 deg.C/min in a temperature range of 100 to 500 deg.C for 0.01 to 10 minutes, and firing the rapidly cooled and dried support at a temperature of 300 to 1000 deg.C. The coating, rapid cooling and rapid drying processes are repeatedly performed 1 to 50 times. The particles dispersed into the colloidal solution are particles of metal, metal oxides, nonmetal oxides, or mixtures thereof.