4-Chlorobenzenesulfonyl chloride is a white prismatic crystal, which is an intermediate for synthetic medicine. There are many traditional production techniques for synthesizing p-chlorobenzenesulfonyl chloride. The main ones that are usually used in industrialized production at home and abroad are the excess chlorosulfonic acid method and the sulfur trioxide method. 4-Chlorobenzenesulfonyl chloride is an acid halide compound and can be used as a pharmaceutical intermediate, mainly for the production of pharmaceuticals such as Thiel.