Chlorosulfonic acid  cas ：7790-94-5 (chemical formula: ClSO2OH) is a colorless or pale yellow liquid with a pungent odor. It fumes in the air and is a compound formed by replacing the -OH group of sulfuric acid with chlorine. The molecule has a tetrahedral structure, with the substituted group located between sulfuric acid and sulfonyl chloride. It has a tear-inducing property and is mainly used for the sulfonation of organic compounds, for the production of drugs, dyes, pesticides, detergents, etc.

Usage: 1. Primarily used for manufacturing sulfonamide drugs, saccharin, and as a sulfonating agent for manufacturing dye intermediates. Also used for manufacturing pesticides, detergents, ion exchange resins, plastics, etc. In military applications, it is used as a smoke agent. 2. Main raw material for industrial pickling. It is used as a sulfonating agent and also for manufacturing pesticides, detergents, ion exchange resins, drugs, and saccharin, etc. 3. Used for manufacturing sulfonamide drugs, serving as a dye intermediate, sulfonating agent, dehydration agent, and for synthesizing saccharin, etc.