Process for the reductive cleavage of linear and cyclic acetals especially formals

US6265623A · kind A · utility

Assignee

• PERSTORP SPECIALTY CHEMICALS AB · SE

Inventors

• Marcus Morawietz · Hanau, DE
• Thomas Haas · Munster, DE
• Olaf Burkhardt · Kalmthout, BE
• Rudolf Vanheertum · Alzenau, DE

Key dates

• Filing date: Aug 26, 1999
• Grant date: Jul 24, 2001
• Expiry date: Aug 26, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C29/90
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The reductive cleavage of linear and cyclic acetals, especially formals, in an aqueous medium containing a formate takes place by hydrogenation with hydrogen in the presence of a heterogeneous hydrogenation catalyst at a pH value of less than 7 at a temperature of over 200.degree. C. The catalyst-poisoning effect of the formate is overcome at over 200.degree. to 300.degree. C., especially from over 200.degree. to 280.degree. C., so that, in a suspension procedure, the weight ratio of metal having hydrogenating activity to acetal is less than 0.1.