This chemical is primarily used as a sulfonating agent in organic synthesis, particularly for introducing sulfonate groups into various organic compounds. It is highly effective in the production of surfactants, dyes, and pharmaceuticals, where sulfonation is a critical step. Additionally, it is utilized in the preparation of sulfonated polymers, which are important in applications like ion-exchange resins and fuel cell membranes. Its ability to act as a mild and controllable sulfonating agent makes it valuable in industries requiring precise chemical modifications.