Patent ID: 6680271
Filing Date: 2004-01-20
Classification: B01J

Abstract:
A process for producing solid zeolite granulates having abrasion resistance, comprising:mixing zeolite A powder in a mixer with aqueous alkali silicate solution to obtain moist zeolite granulates having a particle size of at least 0.1 mm, drying in a first drying step the moist zeolite granulates with drying air, at a temperature from 20Â° to 39Â° C., wherein the carbon dioxide content of the drying air is regulated to less than 200 ppm, drying in a second drying step at a temperature from 40Â° to 120Â° C., activating the granulates at a temperature of not more than 600Â° C., and spraying the granulates with an aqueous silica sol.