Title:
SILICA GEL FOR FILTER AID AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3025609
Kind Code:
B2
Abstract:
PURPOSE: To provide silica gel for a filter aid whose filtering property is hardly deteriorated by one breakdown of particles with the elapse of time and to provide silica gel having excellent adsorbing properties and filtering properties.
CONSTITUTION: Silica gel for a filter aid has particle hardness 10kgf/cm2 or higher, preferably 100-500kgf/cm2. The average particle size is 1-50μm. Moreover, of the silica gel for a filter aid the specific surface area is 300-600m2/g, average diameter of the fine pores is 50-200&angst , and the volume of the fine pores is 0.5-2.0ml/g. the silica gel manufacturing method involves drying silica hydrogel, more specifically, the method involves drying silica hydrogel at an average drying rate of 15% per min (drying standard) or lower at least until the water content lowers to 20%.
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Inventors:
Toshikazu Fukunaga
Tadayuki Akasaki
Tadayuki Akasaki
Application Number:
JP2527694A
Publication Date:
March 27, 2000
Filing Date:
February 23, 1994
Export Citation:
Assignee:
Nippon Silica Industry Co., Ltd.
International Classes:
C12G3/02; B01J20/10; C01B33/16; C12H1/16; (IPC1-7): B01J20/10; C01B33/16; C12G3/02; C12H1/16
Domestic Patent References:
| JP4943897A | ||||
| JP63282706A |
Attorney, Agent or Firm:
Toshio Shiozawa (1 person outside)