PROCESS FOR PRODUCING CARBOXYLIC ACID CHLORIDE

摘要

A process for producing a carboxylic acid chloride whereby a carboxylic acid chloride having a low heat stability or a Vilsmeier reagent type compound in the carboxylic acid chloride, which has a high boiling point and thus can be hardly distilled in practice, can be efficiently decomposed by a convenient procedure without exhibiting any undesirable effect on the subsequent step. More specifically speaking, a process for producing a carboxylic acid chloride characterized by comprising reacting a carboxylic acid with a chlorinating agent in the presence of a catalyst, eliminating the excessive chlorinating agent from the reaction system after the completion of the reaction, further adding to the system the carboxylic acid in an amount of 1.0 to 3.0 equivalents to the catalyst as described above, and thus decomposing a Vilsmeier reagent type compound remaining in the system.