Working up sodium sulfate-containing residues

US4971781A · kind A · utility

Assignee

• BASF SE

Inventors

• Hermann Meyer · Schneizlreuth, DE
• Rainer Roemer · Hemsbach, DE
• Gerhard Pforr · Ludwigshafen, DE

Key dates

• Filing date: Aug 30, 1989
• Grant date: Nov 20, 1990
• Expiry date: Aug 30, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/91
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Sodium sulfate-containing residues are worked up by reducing the sulfate by a process in which the sulfate or a mixture or solution of the sulfate is thermally cleaved by adding oxygen, air or oxygen-enriched air at above 1000.degree. C., in particular above 1200.degree. C., under reducing conditions to give gaseous sulfides and oxides of sulfur as well as alkaline slag. The sulfur compounds contained in the gaseous reaction products can be further processed to sulfur, sulfur dioxide and sulfuric acid.