HIGH PURITY SILICIC ACID POROUS GLASS, METHOD FOR PRODUCING THE SAME, SILICON RAW MATERIAL, HIGH PURITY SILICA RAW MATERIAL, GAS SEPARATION MEMBRANE, FUEL CELL MATERIAL AND METHOD FOR CONCENTRATING SOLUTION

PROBLEM TO BE SOLVED: To provide high purity silicic acid porous glass where the content of silicic acid is at least more than 99 wt.% and a method for producing the same. SOLUTION: The method for producing the high purity silicic acid porous glass where the content of silicic acid (SiO2) is at least more than 99 wt.% is characterized by having a first step to produce mother glass by heating and melting a raw material composition obtained by at least mixing two or more kinds of the ingredients of group II elements and a lithium ingredient in an SiO2-Al2O3-B2O3-Na2O composition system, a second step for phase-separating by heat-treating the mother glass and a third step to elute ingredients except silicic acid by performing acid treatment on the phase-separated mother glass. The high purity silicic acid porous glass produced by the method is provided. COPYRIGHT: (C)2010,JPO&INPIT