Process for preparing vinyl acetate with inhibited by-product formation

US9561997B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Willibald Dafinger · Zweibrücken, DE
• Marc Oliver Eckert · Bodenkirchen, DE

Key dates

• Filing date: Dec 2, 2014
• Grant date: Feb 7, 2017
• Expiry date: Dec 2, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/62
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention provides a process for preparing vinyl acetate in a heterogeneously catalyzed, continuous gas phase process by reacting ethylene with acetic acid and oxygen and subsequently working up the product gas stream, with inhibition of the polymerization of vinyl acetate during the workup of the product gas mixture by addition of one or more N-oxyl compounds which contain at least one N-oxyl radical group —N—O. as inhibitors which comprises adding the N-oxyl compound as a 50 to 85% by weight strength aqueous solution.