Used primarily as an intermediate in the synthesis of dyes and pigments, it plays a key role in producing vibrant and stable colors for textiles and industrial applications. It is also employed in the manufacturing of surfactants, where it enhances the cleaning efficiency of detergents and emulsifiers. In the pharmaceutical industry, it serves as a building block for certain active ingredients, aiding in the development of various medications. Additionally, it is utilized in the production of ion-exchange resins, which are critical for water purification and chemical separation processes. Its versatility makes it valuable in organic synthesis, particularly in reactions requiring sulfonic acid groups.