Process utilizing waste material consisting substantially of phosphorous acid

US3956462A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gero Heymer · Lechenich, DE
• Wolfgang Scheibitz · Frankfurt am Main, DE
• Hasso Spott

Key dates

• Filing date: Mar 18, 1974
• Grant date: May 11, 1976
• Expiry date: Mar 18, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B25/16
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Waste material consisting substantially of contaminated phosphorous acid is utilized. To this end, the phosphorous acid is introduced, with agitation into a liquid phase. Liquid phase and phosphorous acid are maintained in a ratio by volume between 1:1 and 10:1. The liquid phase is placed in a reactor, maintained between 250.degree. and 400.degree.C and selected from a phosphoric acid of the general formula H.sub.n.sub.+2 P.sub.n O.sub.3n.sub.+1, in which n substantially stands for a number between 1 and 5. Resulting hydrogen phosphide is removed. In the event of continuous operation, newly formed liquid phase is removed from the reactor, at the same rate as it is being formed.