Iodine recovery process
AssigneeEthyl Corporation
InventorsKestutis A. Keblys, John M. McEven
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Abstract
Iodine is recovered from an aqueous solution containing iodide such as underground brine by repeated cycles of (1) passing the brine through a basic anion exchange resin to adsorb iodide, and (2) oxidizing adsorbed iodide to iodine by passing an acidified aqueous iodate solution (e.g., NaIO.sub.3) through the resin. The cycle is repeated many times until the resin is iodine-loaded. Iodine is then eluted from the resin, for example, with aqueous NaOH and recovered from the eluate by conventional means.
Claims7
In a process for recovering iodine from brine containing recoverable amounts of iodide, said process comprising repeating cycles of
- (1) passing said brine without acidification or oxidation through a basic anion exchange resin to adsorb iodide ion, and
- (2) oxidizing adsorbed iodide to adsorbed iodine, said cycles being repeated until said resin becomes substantially loaded with iodine and then recovering said iodine from said resin, the improvement wherein said oxidizing is conducted by passing a separately prepared acidified aqueous iodate oxidizing solution through said resin to convert adsorbed iodide to adsorbed iodine.
Dependencies are inferred from the claim text.