Separation of potassium salts
AssigneeThe Dow Chemical Company
InventorIan R. King
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Abstract
The potassium salts in aqueous mixtures of potassium fluoride and potassium salts of organic acids are separated and separately recovered by adding a dipolar, aprotic solvent until two liquid phases are present and then separating the phases. The aqueous phase contains the potassium fluoride and the solvent phase contains the potassium salt of an organic acid. Potassium fluoride and potassium 3,5-dichloro-6-fluoro-2-pyridinate, for example, are separately recovered from aqueous mixtures containing both by adding N-methyl-2-pyrrolidinone.
Claims16
A process for separately recovering potassium fluoride and a potassium salt of an organic acid from an aqueous mixture containing both, which method comprises combining the aqueous mixture with a sufficient amount of dipolar, aprotic solvent to (a) cause two liquid phases to form, one aqueous based and the other dipolar, aprotic solvent based, and (b) contain the potassium salt of an organic acid as a solute in the dipolar, aprotic solvent based phase, and, thereafter, separating the phases so as to recover the potassium fluoride in the aqueous based phase and to recover the potassium salt of an organic acid in the dipolar, aprotic solvent based phase.
Dependencies are inferred from the claim text.