Process for preparing unsaturated ketones

US6307106A · kind A · utility

Assignee

• BASF SE

Inventors

• Carsten Oost · Bad Dürkheim, DE
• Manfred Stroezel · Ilvesheim, DE
• Heinz Etzrodt · Neustadt, DE
• Dietmar Weller · Ludwigshafen, DE
• Gerd Kaibel · Lampertheim, DE
• Hagen Jaedicke · Ludwigshafen, DE

Key dates

• Filing date: Nov 15, 1999
• Grant date: Oct 23, 2001
• Expiry date: Nov 15, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An improved process for preparing lower unsaturated ketones by reacting the corresponding .alpha.,.beta.-unsaturated alcohols with alkyl acetoacetates in a Carroll reaction in the presence of from 0.1 to 5 mol %, based on the alkyl acetoacetate to be reacted, of an organic aluminum compound as catalyst with elimination and continuous removal by distillation of the alkanol eliminated during the reaction from the alkyl acetoacetate in a reactor system with a fitted fractionation column, wherein PA1 A an .alpha.,.beta.-unsaturated alcohol which boils below 140.degree. C. is introduced, in the absence of effective amounts of a solvent, together with the organic aluminum compound into the reaction vessel, PA1 B a reaction temperature which is as constant as possible between 170.degree. C. and 250.degree. C. is set under elevated pressure, PA1 C at this temperature, the alkyl acetoacetate is metered into the mixture, obtained in A, of the .alpha.,.beta.-unsaturated alcohol and the organic aluminum compound, and PA1 D during the reaction the content of alkyl acetoacetate in the reaction mixture is set at a value which is as constant as possible between 0.1 and 10% by weight.