Primarily used as an intermediate in organic synthesis, particularly in the production of dyes and pigments. It plays a key role in the manufacturing of sulfonated compounds, which are essential in creating water-soluble dyes for textiles and paper. Additionally, it is utilized in the development of specialty chemicals, including surfactants and dispersants, which are critical in industries like coatings, detergents, and agrochemicals. Its sulfonic acid group also makes it valuable in ion-exchange processes, particularly in water treatment and purification systems.