公开(公告)号：ZA9405890B

公开(公告)日：1995-03-16

申请号：ZA9405890

申请日：1994-08-05

Applicant: DEGUSSA

Inventor： NEUMUELLER HEINZ ESCH MATTHIAS ,  RAUSCH RALF ,  KUHLMANN ROBERT ,  OTTO KARIN

IPC: A61K8/25 ,  A61Q11/00 ,  C01B33/193 ,  C01B

CPC classification number: C01B33/193 ,  A61K8/25 ,  A61Q11/00 ,  C01P2004/61 ,  C01P2006/12 ,  C01P2006/22

公开(公告)号：ZA945890B

公开(公告)日：1995-03-16

申请号：ZA945890

申请日：1994-08-05

Applicant: DEGUSSA

Inventor： NEUMUELLER HEINZ ESCH MATTHIAS ,  RAUSCH RALF ,  KUHLMANN ROBERT ,  OTTO KARIN

IPC: A61K8/00 ,  A61K8/25 ,  A61Q11/00 ,  C01B33/193 ,  C01B

Abstract: A process for the production of a precipitated silica which has a BET surface area of 10-130 m2/g, a CTAB surface area of 10-70 m2/g, an average particle diameter of 5-20 μm, a Cu abrasion value in a 10% glycerol dispersion of 4-50 mg and thickening behavior in a CMC solution (20% dispersion) of 300-3500 mPa.s, which is characterize in simultaneously adding alkali silicate (weight modulus SiO2:alkali oxide = 2.5-3.9:1) and a mineral acid to an initial amount of water which has been adjusted to a pH value of 7.0 to 9.9 or 10.0 to 10.7 by the addition of water glass, holding the pH value constant between 7.0 and 9.9 or 10.0 to 10.7 during addition, in which the initial precipitation temperature is 50-90℃ and an increase in viscosity occurs after at most 25% of the duration of precipitation, adjusting the pH value to ≦̸6, once a pH of 7.0 to 9.9 at the start of precipitation and a silica content of greater than 120 g/l or a pH of 10.0 to 10.7 at the start of precipitation and a silica content of greater than 150 g/l has been reached, separating the solid by filtration, washing, drying and grinding it to form a filtration cake or fluidized filtration cake.