Patent ID: 6060526
Filing Date: 2000-05-09
Classification: B01J

Abstract:
A non-agglomerating mixed bed ion exchange system comprising a strong base quaternary ammonium anion exchange resin and a strong acid sulfonated cation exchange resin, wherein the anion exchange resin has been pretreated with 15 to 100 milligrams of water-soluble sulfonated poly(vinylaromatic) polyelectrolyte per liter of anion exchange resin to maintain anion exchange resin kinetics substantially unchanged compared to the anion resin kinetics of the anion exchange resin before being pretreated; wherein the pretreated anion resin has a sulfate ion mass transfer coefficient of at least 1.5.times.10.sup.-4 meters/second; wherein the pretreated anion resin has a sulfate ion mass transfer coefficient value greater than at least about 80% of the sulfate ion mass transfer coefficient of the anion exchange resin before being pretreated; and wherein the number average molecular weight of the sulfonated poly(vinylaromatic) polyelectrolyte is from 10.000 to 100.000.