Purification of wet-processed phosphoric acid using anhydrous solvents

US3953581A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Klaus-Peter Ehlers
• Wolfgang Scheibitz · Frankfurt am Main, DE
• Gero Heymer · Lechenich, DE

Key dates

• Filing date: Apr 24, 1974
• Grant date: Apr 27, 1976
• Expiry date: Apr 24, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B25/234
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Contaminated wet-processed phosphoric acid is purified. To this end, the wet-processed phosphoric acid is mixed with one or more organic solvents, in which water is partially soluble, the organic solvent(s) is (are) separated from unabsorbed wet-processed phosphoric acid portions, and phosphoric acid is recovered from the organic solvent(s) so separated. The organic solvent(s) are more particularly used in the form of anhydrous material and at least in the quantity necessary to ensure dissolution (a) of the overall quantity of phosphoric acid contained in the wet-processed phosphoric acid and (b) of the free water therein.