Process for the production of alkali dichromates and chromic acid employing an anode of valve metal activated by electrodepositing noble metals from melts

US4981573A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Helmut Klotz · Friedrichshafen, DE
• Rainer Weber · Leverkusen, DE
• Hans-Dieter Block · Cologne, DE
• Norbert Lonhoff · Leverkusen, DE

Key dates

• Filing date: Aug 11, 1989
• Grant date: Jan 1, 1991
• Expiry date: Aug 11, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25B1/22
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for the production of alkali dichromates and chromic acid by electrolysis of alkali monochromate or alkali dichromate solutions wherein the anodes used in the electrolysis are dimensionally stable anodes of valve metals activated by electrodeposition of noble metals and/or noble compounds from melts containing noble metal salts.