Method for producing tert-butyl esters of aliphatic c1-c4-carboxylic acids

US6756506B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ruprecht Kroker · Frankenthal (Pfalz), DE
• Gerhard Nestler · Ludwigshafen, DE
• Werner Schmitt · Starnberg, DE
• Winfried Schumm · Gelsenkirchen, DE

Key dates

• Filing date: Jan 27, 2003
• Grant date: Jun 29, 2004
• Expiry date: Jan 27, 2023

Classification

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

Abstract

The tert-butyl ester of an aliphatic C1-C4-carboxylic acid is prepared by reacting the carboxylic acid with isobutene in the liquid phase in the presence of an acidic catalyst by a continuous process in which the reaction is carried out in a reactor divided into a plurality of sections, the carboxylic acid, the isoolefin and the catalyst are fed into the first section of the reactor, the reaction mixture obtained is removed from the last section of the reactor and the ester is isolated therefrom, the reaction temperature in the reactor being controlled so that it is from 10 to 40° C. and is highest in the first section of the reactor.The novel process permits the technically simple, economical and environmentally friendly preparation of tertiary butyl esters of saturated and unsaturated C1-C4-carboxylic acids.