PROCEDE ET SOLVANT D'EXTRACTION DES CHROMATES PRESENTS DANS UNE SOLUTION AQUEUSE

• Main Author: DIDIER BEUTIER, CLAUDE PALVADEAU, GILLES PASQUIER ET MARC DIETRICH
• Format: Patent
• Language: French
• Published: 24.09.1982
• Subjects: APPARATUS THEREFOR; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS THEREOF; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

L'INVENTION CONCERNE UN PROCEDE ET UN SOLVANT D'EXTRACTION DES CHROMATES PRESENTS DANS UNE SOLUTION AQUEUSE.SELON L'INVENTION, ON MET EN CONTACT LA PHASE AQUEUSE AVEC UNE PHASE ORGANIQUE COMPORTANT 2 A 10 EN VOLUME D'UN SOLVANT CHOISI DANS LE GROUPE DES AMINES TERTIAIRES OU QUATERNAIRES ET 10 A 40 D'UN SOLVANT CHOISI PARMI LE GROUPE DES ESTERS D'ACIDES PHOSPHORIQUE DANS UN DILUANT A BASE D'HYDROCARBURES DE PETROLE.APPLICATION A LA PRODUCTION DE SOLUTIONS CONCENTREES DE CHROMATES FACILEMENT RECYCLABLES A PARTIR D'UNE EXTRACTION DES CHROMATES CONTENUS DANS UNE SOLUTION INDUSTRIELLE. 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.