Removal of silica from mixed bed demineralizer

Details Removal of silica from mixed bed demineralizer Removal of silica from mixed bed demineralizer

C - Chemistry, Metallurgy

02

F

362/37

C02F 1/42 (2006.01) B01J 39/00 (2006.01) B01J 49/00 (2006.01) B01J 49/02 (2006.01)

Patent

CA 1105158

U.S. 860,690 ABSTRACT OF THE DISCLOSURE Silica can be removed effectively from a mixed bed demineralizer containing an anion exchange resin and a cation exchange resin during regeneration by (1) passing from about 30 to about 80 volume % of an anion regenerant solution through only the anion exchange resin, (2) passing the remaining portion of the anion regenerant solution through both the anion exchange resin and the cation exchange resin, and (2) passing a stream of cation regenerant solution through the cation exchange resin. The amount of silica on the resins is reduced by this treatment such that when silica-containing water is passed through the demineralizer during normal operations, the concentration of silica in the treated water as SiO2 will be less than 0.1, most preferably less than 0.005, milligrams per liter.

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