公开(公告)号：JPH10130003A

公开(公告)日：1998-05-19

申请号：JP3375897

申请日：1997-02-18

Applicant: AGENCY IND SCIENCE TECHN

Inventor： YODA SATOSHI ,  IGASAKI FUMIKAZU ,  OSHIMA SATORU ,  KAWAI AKIKO ,  KAMIYA KUNIO ,  UCHIDA KUNIO ,  GOTO AKIHIRO

IPC: C01B13/14 ,  B01J13/00 ,  C01B33/158 ,  C01G23/053

Abstract: PROBLEM TO BE SOLVED: To obtain an aerogel of an excellent bulk body free from the generation of shrinkage and crack by holding a wet gel body of a metal oxide, a solvent and a specific material under a prescribed condition and removing the solvent to dry the wet gel body. SOLUTION: The wet gel body of the metal oxide (e.g. a silica wet gel body obtained by impregnating the gel body, which is obtained by mixing tetramethoxysilane with a methanol/ammonia water, pouring to a prescribed shaped vessel and allowing to stand, with methanol to remove an unreacted component), the solvent (e.g. methanol) and a granular zeolite having preferably 2-3mm average particle diameter are held under the critical condition or super critical condition (e.g. 280 deg.C 140atm) of the solvent preferably for 1-3hr and after that, the solvent is gradually released and removed to dry the wet gel body.

公开(公告)号：JPH0891821A

公开(公告)日：1996-04-09

申请号：JP5328794

申请日：1994-02-25

Applicant: AGENCY IND SCIENCE TECHN

Inventor： IGASAKI FUMIKAZU ,  UCHIDA KUNIO ,  KAWAI AKIKO

IPC: B01J13/04 ,  C01B33/152

Abstract: PURPOSE: To produce high purity silica particles by a sol-gel method. CONSTITUTION: Alcohol, water and an acid catalyst are added to tetra-ethyl orthosilicate, partial hydrolysis is carried out and dibutyl phthalate is added. The resultant soln. is brought into emulsification and polycondensation by mixing and stirring in an aq. ammonia soln. contg. a surfactant to produce the objective high purity spherical hollow porous silica particles having low specific gravity, e.g. spherical hollow porous silica particles having 2-8μm average particle diameter, about 300m /g specific surface area and 0.16g/ml bulk density.