PROCESS FOR THE PREPARATION 4,4'-DICHLORODIPHENYLSULPHONE

摘要

The invention relates to a method for producing 4-chlorobenzene sulphonic acid from 2-chlorobenzene sulphonic acid and/or 3-chlorobenzene sulphonic acid, comprising the reaction of 2-chlorobenzene sulphonic acid and/or 3-chlorobenzene sulphonic acid to form 4-chlorobenzene sulphonic acid in the presence of sulphuric acid at a temperature of 100 to 300°C. The invention further relates to a method for producing 4,4'-dichlorodiphenylsulphone, comprising said method for producing 4-chlorobenzene sulphonic acid.