Process and solvent for extraction of the chromates present in an aqueous solution
AssigneeKrebs & Cie
InventorsDidier Beutier, Claude Palvadeau, Gilles Pasquier, March Dietrich
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Abstract
The invention relates to a process and a solvent for extraction of the chromates present in an aqueous solution. According to the invention, the aqueous phase is brought into contact with an organic phase comprising 2 to 10% by volume of a solvent selected from the group of tertiary or quaternary amines and 15 to 40% of a solvent selected from the group of esters of phosphoric acid in a diluent based on petroleum hydrocarbons. The invention is applicable to the production of concentrated solutions of chromates easily recyclable from an extraction of the chromates contained in an industrial solution.
Claims7
Process for extracting chromates present in an aqueous chlorides-chlorates brine solution comprising the steps of maintaining said solution at a pH lower than 6, bringing said solution into sufficient contact with a liquid organic phase to extract chromates into the organic phase in which the organic phase consists essentially of by volume a mixture of 2 to 10% of a solvent selected from the group of tertiary and quaternary amines and 15 to 40% of a solvent selected from the group of esters of phosphoric acid in a petroleum hydrocarbon system, and extracting said chromates from said organic phase by bringing it into contact with a alkaline removal solution.
Dependencies are inferred from the claim text.