Process for preparing chromium(III) oxide

US9663383B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Rainer Ortmann · Cologne, DE
• Matthias Stenger · Monheim, DE
• Matthias Boll
• Holger Friedrich · Frankenthal (Pfalz), DE

Key dates

• Filing date: Mar 23, 2011
• Grant date: May 30, 2017
• Expiry date: Jul 21, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing chromium(III) oxide by reaction of alkali metal chromate with gaseous ammonia, subsequent hydrolysis, isolation of the hydrolysis product and calcination.