Patent ID: 6440381
Filing Date: 2002-08-27
Classification: B01J,C01B

Abstract:
A continuous process for the conversion of sodium silicate to silicic acid comprising:(a) providing a moving bed comprising a protonated ion exchange resin that exchanges a sodium ion in sodium silicate with a proton, (b) providing an inlet stream of sodium silicate, (c) contacting said inlet stream of sodium silicate with said protonated ion exchange resin in said moving bed to provide an outlet stream of silicic acid and a moving bed comprising a sodium-enriched ion exchange resin, (d) providing an inlet stream of acid that exchanges a sodium ion in said sodium-enriched ion exchange resin with a proton, (e) contacting said inlet stream of acid with said sodium-enriched ion exchange resin in said moving bed to provide a sodium enriched outlet stream and a moving bed comprising a protonated ion exchange resin that exchanges a sodium ion in sodium silicate with a proton, and (f) recycling said protonated ion exchange resin of step (e) in step (a).