Preparation of carboxylic chlorides

US5430186A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Ksoll · Dossenheim, DE
• Wolfgang Reuther · Neckargemünd, DE
• Roland Ettl · Haßloch, DE

Key dates

• Filing date: Jul 14, 1994
• Grant date: Jul 4, 1995
• Expiry date: Jul 14, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J14/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the continuous manufacture of carboxylic chlorides (I) of the general formula R-COCl, in which R stands for a C-organic radical containing from 1 to 30 C atoms, by the reaction of a carboxylic acid (II) with a reaction product (III) of phosgene (IV) and an N,N-substituted formamide (V), in which compounds II and III are passed in parallel flow upwardly into a zone, filled with compound III, in a reactor (1), the reaction mixture is allowed to rise in predominantly laminar flow, such that phase separation occurs to give a top I-phase and a bottom phase III' mainly comprising compound III and formamide formed and compound I is removed from the top phase and also portions of the bottom phase III' are removed at the rate at which they are formed.