PROCESS FOR THE CONVERSION OF ISOMERIC MIXTURE OF DICHLORODIPHENYL SULFONES TO CHLOROBENZENE

摘要

The invention relates to a process for the single step conversion of isomeric mixture of dichlorodipheriyi sulfones to chlorobenzene. The invention further relates a process of using dilute sulfuric acid and re-circulating the dilute sulfuric acid.

主权项

1. A single step process for the conversion of isomeric mixture of dichlorodiphenyl sulfones to chlorobenzene in steps comprising:
a) Treating the isomeric mixture of dichlorodiphenyl sulfone with dilute sulfuric acid, b) Azeotropiclly distilling of the reaction product to obtain chlorobenzene, c) Neutralizing the chlorobenzene with aqueous alkali solution and distilling the same obtain significantly moisture free chlorobenzene, d) Reusing the residual acid of step (b) and re-circulating chlorobenzene in the process for production of 4,4′-dichlorodiphenyl sulfone.