Catalysts for the gas-phase oxidation of ethylene and acetic acid to vinyl acetate, a process for producing them and their use

US6849243B1 · kind B1 · utility

Assignee

• CELANESE CHEMICALS EUROPE GMBH · DE

Inventors

• Alfred Hagemeyer · Sunnyvale, US
• Harald Werner · Mannheim, DE
• Uwe Dingerdissen · Seeheim-Jugenheim, DE
• Klaus Kuhlein · Kelkheim, DE
• Günter Dambeck · Bad Camberg, DE
• Gerhardt Geiss · Liederbach, DE
• Andrea Rutsch · Riedstadt, DE
• Stephan Weidlich · Frankfurt am Main, DE

Key dates

• Filing date: Mar 21, 2000
• Grant date: Feb 1, 2005
• Expiry date: Mar 21, 2020

Classification

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

Abstract

The invention relates to a supported catalyst and the production and use thereof in the synthesis of vinyl acetate in the gaseous phase from ethylene, acetic acid and oxygen, or from gases containing oxygen, whereby the activity and selectivity are simultaneously improved. The catalyst contains palladium, at least one alkali metal compound and optionally one or more catalyst accelerators, in particular, gold, barium and/or cadmium on a porous support. Said support contains at least one reducible metal oxide, in particular oxides of the elements of groups IIIb, IVb, Vb, VIb from the periodic table of elements. Once the support has been loaded with at least one palladium compound, a reduction is carried out at a temperature of >200° C.