Process for removing chromate ion from a concentrated solution o

Details Process for removing chromate ion from a concentrated solution o Process for removing chromate ion from a concentrated solution o

1997-01-27

1998-05-05

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210684, B01D 1500

Patent

active

057469229

ABSTRACT:
A process for removing contaminating levels of hexavalent chromium ion process includes providing a vessel containing a water-insoluble adsorption medium having a plurality of polymerized pyridyl-containing adsorption sites. An influent of an aqueous solution of about 1.0 to about 2.0 molar (e.g., saturated) sodium sulfate having a total hexavalent chromium ion concentration of up to about 1000 parts per million, to the vessel to contact the insoluble adsorption medium. The solution is maintained in contact with that insoluble adsorption medium for a time period sufficient for the medium to bind the hexavalent chromium ions in the contacting solution. The resulting aqueous solution is discharged from the vessel as an effluent having a total hexavalent chromium ion concentration whose ratio to the total hexavalent chromium ion concentration of the influent is about zero to about 25.0.times.10.sup.-6.

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Reilly 5.sup.th Edition Product Index
Frechet et al., J. Org. Chem., 46:1728-1730 (1981).

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