Method of separating catalyst-free working solution from the hydrogenation cycle of the anthraquinone method for the production of hydrogen peroxide

US5534149A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Hans Birkenbeil · Frankfurt, DE
• Ulrich Brand
• Gustaaf Goor · Hanau, DE
• Wolfgang Kunkel · Dresden, DE

Key dates

• Filing date: Mar 20, 1995
• Grant date: Jul 9, 1996
• Expiry date: Mar 20, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method is shown for the separation of catalyst-free working solution from working solution, containing noble-metal black, especially palladium black as catalyst, of the hydrogenation cycle of the so-called anthraquinone method for the production of hydrogen peroxide by filtration of the catalyst-containing working solution using filter candles. The filter candles are formed of an open-pore support body based on a carbon material or metallic or ceramic material with an average pore width in a range of 5 to 100 .mu.m and of a single-layer or multi-layer membrane of ceramic material with an average pore width in a range of at least about 1 up to 10 .mu.m located on the outside surface of the support body.