Sulfanilic acid, chemically known as 4-aminobenzenesulfonic acid (CAS 121-57-3), is a fundamental organic compound that plays a pivotal role across numerous industrial sectors. Its unique structure and reactivity make it a versatile intermediate, vital for applications ranging from vibrant dye production to the synthesis of essential pharmaceuticals and precise analytical reagents. For professionals in chemical procurement and R&D, a comprehensive understanding of Sulfanilic acid's properties, synthesis, and market availability is crucial.

The synthesis of Sulfanilic acid primarily involves the sulfonation of aniline. This process, often carried out using concentrated sulfuric acid at elevated temperatures, proceeds through an intermediate phenylsulfamic acid, which rearranges to form the final product. The resulting Sulfanilic acid is typically a white crystalline solid, often appearing off-white or even purplish due to trace impurities, though high-purity grades are readily available from manufacturers. A notable characteristic is its zwitterionic nature, where the sulfonic acid group is deprotonated and the amine group is protonated, contributing to its unusually high melting point and solubility profile.

The industrial value of Sulfanilic acid is underscored by its diverse applications. As previously highlighted, it is a key intermediate in the synthesis of azo dyes, imparting color to textiles, paper, and other materials. In the pharmaceutical industry, it is essential for manufacturing sulfa drugs, a critical class of antibacterial agents. Furthermore, its utility extends to analytical chemistry as a reagent for detecting nitrites and in other applications like corrosion inhibition. This broad applicability makes it a compound of significant commercial interest.

For businesses looking to procure Sulfanilic acid, sourcing from a reliable manufacturer in China offers a strategic advantage. NINGBO INNO PHARMCHEM CO.,LTD. is a leading Sulfanilic acid supplier, committed to delivering high-purity material that meets exacting industry standards. We understand the importance of a stable supply chain and competitive pricing for our clients. Whether you are developing new dyes, synthesizing life-saving drugs, or conducting precise chemical analyses, our Sulfanilic acid is a dependable choice. Contact us today to explore how we can support your chemical sourcing needs and provide a consistent supply of this indispensable compound.