Catalyst, method of its production and its use for the production of vinyl acetate monomer

US5808136A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Thomas Tacke · Friedrichsdorf, DE
• Herbert Mueller · Herznach, CH
• Uwe Ohlrogge · Hanau, DE
• Francis P. Daly · Delaware, US
• Hans Lansink Rotgerink · Goldbach, DE
• Helmfried Krause · Rodenbach, DE

Key dates

• Filing date: Jan 23, 1996
• Grant date: Sep 15, 1998
• Expiry date: Jan 23, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J37/0248
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A catalyst and method of its production for use in making vinyl acetate monomer. The carrier is impregnated with a basic solution and a solution containing gold salts and palladium salts and finally impregnated with alkali acetate. The activity and selectivity of the catalyst, its mechanical strength, the noble-metal adhesion and the dispersion of noble metal on the carrier can be improved if the carrier is impregnated in a pretreatment with salts containing as cation elements of groups IA, IIA, IIIA and IVB of the periodic table and as anions elements of group VIIA or complex anions such as nitrate, sulfate or anions of organic acids such as acetate and lactate and is subsequently dried and calcined at temperatures of at least 160.degree. C.