Process for separating iodine and its compounds from the products obtained on subjecting dimethylether, methyl acetate or methanol to carbonylation

US5169982A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Erpenbach Heinz · Cologne, DE
• Klaus Gehrmann · Lechenich, DE
• Peter Horstermann · Lechenich, DE

Key dates

• Filing date: Sep 16, 1986
• Grant date: Dec 8, 1992
• Expiry date: Sep 16, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/573
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Iodine and its compounds are separated from the carbonylation products acetic acid, acetic anhydride or ethylidene diacetate obtained on subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction in the presence of an iodine-containing catalyst. The quantity of total iodine contaminating the carbonylation products is reduced to less than 20 ppb iodine by treating the products at 20.degree.-200.degree. C. with peracetic acid, diacetyl peroxide or a compound yielding these two agents under the reaction conditions, and separating them distillatively.