Method for purifying acid chlorides

US6727384B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Ralph Busch · Olney, US
• Heinz-Josef Kneuper · Mannheim, DE
• Theodor Weber · Ludwigshafen, DE
• Winfried Müller · Mannheim, DE
• Armin Stamm · Mainz, DE
• Jochem Henkelmann · Mannheim, DE

Key dates

• Filing date: Mar 12, 2002
• Grant date: Apr 27, 2004
• Expiry date: Jun 28, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/64
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the purification of carbonyl chlorides which have been prepared by reacting carboxylic acids with phosgene or thionyl chloride in the presence of a catalyst adduct, in which the carbonyl chlorides are treated with a hydrohalide of carboxamides of the formula (I) in which R1 is hydrogen or C1- to C3-alkyl; R2 and R3 independently of one another are C1- to C4-alkyl, or R2 and R3 together are a C4- or C5-alkylene chain, and the carbonyl chloride purified in this way is isolated by separation off from the carboxamide hydrohalide phase.