Patent ID: 6379556
Filing Date: 2002-04-30
Classification: B01J,C02F

Abstract:
A process for recovering iodide from chemical process wastewater which comprises:(A) treating the wastewater containing iodide, and optionally other inorganics and organics, with a strongly basic anion-exchange resin in free-base form and, when the wastewater contains at least one other inorganic or at least one organic, washing the resin with aqueous solvent to remove materials not sorbed on the resin; (B) treating the strongly basic resin with aqueous strong acid to desorb the iodide as HI; (C) passing the HI solution from Step B through a weakly basic anion-exchange resin in free-base form and, when the wastewater contains at least one other inorganic or at least one organic, washing the resin with aqueous solvent to remove unsorbed materials; and (D) treating the weakly basic resin with aqueous base to desorb the iodide as an iodide salt.