METHOD FOR SEPARATING REACTION PRODUCT AND IMIDE COMPOUND

摘要

PROBLEM TO BE SOLVED: To provide a method capable of efficiently separating an oxidizing catalyst and a high purity reaction product (aromatic carboxylic acid or the like) by simple operation. SOLUTION: A substrate and oxygen are brought into contact with each other in the presence of the oxidizing catalyst such as N-hydroxyphthalimide, N-acetoxyphthalimide or the like and a solvent is used to crystallize the reaction product by cooling crystallization or a crystallzing solvent and the oxidizing catalyst is distributed to a solvent phase. The reaction product may be concentrated prior to the crystallization of the reaction product. This method uses a 1-4C alkanecarboxylic acid, 1-10C alkyl alcohol or a water-containing solvent as the crystallizing solvent and the reaction product is useful for separating 6 or more C aliphatic carboxylic acid or aromatic carboxylic acid and the oxidizing catalyst.