Process for removing iron, chromium and vanadium from phosphoric acid
AssigneeFMC Corporation
InventorsRichard E. Hall, Denise D. Goyden
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Abstract
A process is provided for purifying phosphoric acid, such as wet process phosphoric acid by extracting the impure phosphoric acid with a nonaqueous solvent and contacting the nonaqueous solution of phosphoric acid with a strongly basic anion exchange resin and recovering the purified phosphoric acid by stripping the nonaqueous solution with an aqueous solution.
Claims12
In a process for purifying phosphoric acid by the process comprising extracting an impure aqueous solution of phosphoric acid with an organic solvent, thereby forming an aqueous raffinate, and a nonaqueous solution of phosphoric acid in said solvent, and stripping phosphoric acid from said solvent with an aqueous solution, the improvement comprising contacting said nonaqueous solution of phosphoric acid with a strongly basic anion exchange polymer thereby removing therefrom a metal selected from the group consisting of iron, chromium and vanadium.
Dependencies are inferred from the claim text.