Patent ID: 6187381
Filing Date: 2001-02-13
Classification: B01D,C01B,Y10T

Abstract:
A process for preparing a fibrous structure suitable for use as a dehumidification element impregnated with at least about 80 kg/m.sup.3 of silica gel, comprising:initially immersing a fibrous structure in silica sol to form an impregnated structure,drying the resulting impregnated structure,immersing the dried impregnated structure in a mixed solution of an alkali silicate solution and an alkali hydroxide solution, said alkali silicate solution having an alkali silicate content of 20 to 35 wt % and said alkali hydroxide solution having an alkali hydroxide content of 20 to 50 wt %, wherein the molar ratio of silicon oxide to alkali oxide is adjusted so that it does not exceed 10,removing the impregnated structure from the mixed solution,heating the impregnated structure removed from the mixed solution at from 30-90.degree. C. for at least 15 minutes, and thereaftertreating the resulting structure with an aqueous acid solution, andsubsequently drying the thus treated structure.