Patent ID: 6670302
Filing Date: 2003-12-30
Classification: B01J,C08F

Abstract:
A process for manufacture of a chromium-containing silica catalyst, said process comprising:(a) concurrently combining alkali metal silicate solution and mineral acid to form a mixture having pH of 6-10 and a silica content of about 16-21 wt. % and maintaining said mixture at a temperature of about 10-20Â° C.; (b) rapidly gelling said mixture into beads; (c) washing said beads in an aqueous bath at a pH in the range of about 3 to 6 for about 15 to 30 hours; (d) aging said beads in an alkaline bath having a pH of about 8-10 for about 5-25 hours; (e) immersing said aged beads in an organic solvent suitable for azeotropic distillation, and removing water from said beads by azeotropic distillation; and (f) drying said beads; provided that a chromium compound is added to the mixture to be gelled, or to said beads before or during step (e) or after step (f).