Process for reprocessing sulfuric acid from phosphorous purification

US5122359A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Werner Pieper · Kerpen, DE
• Walter Biermann · Frechen, DE

Key dates

• Filing date: Jul 25, 1990
• Grant date: Jun 16, 1992
• Expiry date: Jul 25, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/90
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for reprocessing sulfuric acid obtained in the purification of yellow phosphorous, which comprises mixing the contaminated sulfuric acid with hydrogen peroxide and reacting this mixture in a vessel containing hot concentrated sulfuric acid at 110.degree. to 210.degree. C. in the presence of FeSO.sub.4, MnSO.sub.4 or NiSO.sub.4 as a catalyst is described.