Process for production of oximes cocatalyzed by ammonium salts or substituted ammonium salts

US6462235B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Georg Thiele · Hanau, DE
• Thomas Schiffer · Haltern, DE
• Georg Oenbrink · Schneverdingen, DE

Key dates

• Filing date: Nov 21, 2001
• Grant date: Oct 8, 2002
• Expiry date: Nov 21, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C249/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Oximes are produced in high yields and with high selectivity by reacting aldehydes or ketones with hydrogen peroxide and ammonia in the presence of a heterogeneous catalyst and an ammonium salt or substituted ammonium salt. The heterogeneous catalyst is synthesized on the basis of titanium, silicon and oxygen. Optionally, a Lewis-acid and/or Brnsted-acid cocatalyst can be present.