Patent ID: 6565905
Filing Date: 2003-05-20
Classification: C01B,C12H

Abstract:
A dehydrated silica gel for haze reduction treatment of beer having a specific surface area of 700-1000 m2/g, a pore volume of 1.1-1.6 ml/g, an average pore diameter of 6.8-10 nm, and improved adsorbability characteristics, the dehydrated silica gel being prepared by a method comprising the steps of:preparing a silica hydrosol by reacting silicate with inorganic acid such that the SiO2 concentration is between10% and 20% by weight; gelling the silica hydrosol to form a silica hydrogel; washing the silica hydrogel with water; then hydrothermally treating the silica hydrogel with water at a temperature of 20-100Â° C. within a first pH range; treating the silica hydrogel with either an inorganic or an organic acid within a second pH range; finely grinding the washed, hydrothermally treated and acid treated silica hydrogel into particles having an average particle size of 5-30 &mgr;m; rapidly drying the ground silica hydrogel at a temperature of 100-1000Â° C. for 1 second to 100 seconds to form a dried silica gel; subsequently calcining the dried silica gel at a temperature of 400-800Â° C. for 10 seconds to 10 hours to improve adsorbability characteristics by reducing a non-adsorbing portion of the silica gel or modifying the chemical structure of at least a portion of the silica gel.