Process for separating metal sulphates from sulphuric acid

US4952387A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Lailach · Krefeld, DE
• Rudolf Gerken · Krefeld, DE
• Wolfgang Rens · Krefeld, DE

Key dates

• Filing date: Jul 13, 1988
• Grant date: Aug 28, 1990
• Expiry date: Jul 13, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for the separation of metal sulphates from dilute sulphuric acid by evaporative concentration of the sulphuric acid to a concentration of from 55 to 75% by weight H.sub.2 SO.sub.4, cooling of the resulting solution or suspension and mechanically separating the solid metal sulphates and/or hydrogen sulphates, wherein an Fe(III) content of at least 0.01% by weight is ensured before the separation.