Carrier catalyst, process for the production therefor for the preparation of vinyl acetate

US5777156A · kind A · utility

Assignee

• Hoecht Aktiengesellschaft · DE

Inventors

• Roland Abel · Oberhausen, DE
• Karl-Fred Worner · Uhingen, DE

Key dates

• Filing date: Apr 7, 1997
• Grant date: Jul 7, 1998
• Expiry date: Apr 7, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/055
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to Pd/K/Au, Pd/K/Ba or Pd/K/Cd supported catalysts built up in the form of an outer layer, the production thereof and the use thereof for preparing vinylacetate from ethylene, acetic acid and oxygen in the gas phase. The specified catalysts are produced by impregnating the support particles with a solution of salts of the corresponding elements and then drying them, with the dynamic viscosity of the solution being at least 0.003 Pa.s and the solution volume in impregnation being more than 80% of the pore volume of the support particles and the duration of the impregnation and also the time until commencement of the drying being selected so as to be sufficiently short for, after completion of the drying, the specified metal salts to be present in an outer layer of from 5% to 80% of the pore volume of the support particles.