Method for the preparation of 4,4'-dichlorodiphenyl ether

Abstract

The invention relates to a process for the preparation of 4,4′-dichlorodiphenyl ether used as a starting substance in chemical synthesis including polymer synthesis. The method includes solvent-free treatment of the diphenyl ether with sulfuryl chloride. The reaction is carried out in a closed autoclave at 115-125° C. for 16-20 h. The isolation of the final product is done by fractional distillation of the resulting mixture of isomers. If necessary, additional crystallization is used, which gives an increased purity of the product (>95%). The method of the invention allows to increase the yield of the target product, to reduce the total time of the process and the consumption.

Dependencies are inferred from the claim text.