Continuous preparation of alkyl esters of (meth) acrylic acid

US5945560A · kind A · utility

Assignee

• BASF SE

Inventors

• Gabriele Iffland · Heidelberg, DE
• Albrecht Dams · Monsheim, DE
• Alexander Weck · Freinsheim, DE
• Heinrich Aichinger · Mannheim, DE
• Holger Herbst · Bischofswerda, DE
• Gerhard Nestler · Ludwigshafen, DE
• Herbert Exner · Waldsee, DE

Key dates

• Filing date: Jan 28, 1997
• Grant date: Aug 31, 1999
• Expiry date: Jan 28, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/54
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process and an apparatus for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid with alkanols having from 1 to 5 carbon atoms in a homogeneous, liquid, solvent-free phase at elevated temperature and in the presence of an acid esterification catalyst, in which the (meth)acrylic acid, the alkanol and the catalyst are fed to a reaction zone, the water formed is removed by rectification during a residence time as constituent of a mixture comprising alkanol in a rectification unit superposed on the reaction zone, the distillate thus obtained is separated into an organic phase comprising alkanol and an aqueous phase comprising water, the organic phase is returned to the rectification unit, the reaction mixture is discharged from the reaction zone and conveyed into a distillative separation zone comprising further rectification units and in the latter the alkyl (meth)acrylate formed is separated off.