B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
362/41
B01D 15/04 (2006.01) B01J 20/34 (2006.01) B01J 49/00 (2006.01) C01F 5/40 (2006.01) C01F 11/46 (2006.01)
Patent
CA 1177467
ABSTRACT A method of removing calcium from cation exchange resin beads containing adsorbed calcium and magnesium by passing aqueous sulfuric acid, of 20 to 50% by weight concentration saturated with calcium sulfate and containing magnesium sulfate substantially below saturation, through a bed of the resin beads continuously until the adsorbed magnesium is in ion exchange equilibrium with solution mignesium, while simultaneously exchanging solution hydrogen ions for the adsorbed calcium ions. The sulfuric acid solution becomes supersaturated with calcium sulfate and is then passed to a crystallizer where the calcium sulfate is precipitated. The sulfuric acid solution in the crystallizer is recycled to the resin bed after precipitation of the calcium sulfate, and can be continued up to the point until at least 75% of the adsorbed calcium has been removed while the adsorbed magnesium remains in the beads.
404802
Erickson William R.
Whitney Solon G.
American Petro Mart Inc.
Borden Ladner Gervais Llp
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