Process for removing organic phosphorous compounds and other impurities from dilute sulfuric acid

US6083470A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gerhard Diekhaus · Oberhausen, DE
• Harald Kappesser · Oberhausen, DE

Key dates

• Filing date: Apr 14, 1994
• Grant date: Jul 4, 2000
• Expiry date: Apr 14, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/905
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Sulfuric acid which contains dilute organic phosphorus compounds and other impurities and is obtained, for example, during preparation of sulfonated arylphosphines, is purified by extraction with an amine which is sparingly soluble or insoluble in water.