Used primarily as an intermediate in the production of dyes and pigments, particularly for textile and paper industries. It plays a key role in synthesizing azo dyes, which are valued for their vibrant colors and stability. Additionally, it is employed in the manufacturing of optical brighteners, enhancing the whiteness and brightness of materials like fabrics and detergents. Its sulfonate group also makes it useful in water treatment processes, where it acts as a dispersant to prevent scaling and fouling in industrial systems.