Method of producing acetone-cyanhydrin

US6417385B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Walter Börner · Alzenau, DE
• Liane Deusser · Langen (Hessen), DE
• Ralph Marquardt · Schreiber, CA
• Rudolf Vanheertum · Alzenau, DE
• Karl-Heinz Vieweg · Alzenau, DE

Key dates

• Filing date: Dec 28, 2001
• Grant date: Jul 9, 2002
• Expiry date: Dec 28, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C253/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Acetone-cyanhydrin can be produced in a gas-liquid reactor from a hydrogen cyanide-containing gas, especially the crude gas originating from a methane-ammonia (BMA) or Andrussow process, and acetone in the presence of a base. The aim of the invention is to overcome the disadvantages of the methods for producing acetone-cyanhydrin known from the art. To this end, the gaseous phase removed from the reactor is liberated from the unreacted acetone and hydrogen cyanide in a gas purifier that is operated with a high-boiling solvent, especially with stabilized acetone-cyanhydrin, and the washed phase is fed to the gas-liquid reactor.