Sulfanilic acid, known by its CAS number 121-57-3, is a versatile organic compound that plays a crucial role in various industrial sectors. Characterized as a greyish-white crystalline powder, it is a vital intermediate with applications spanning from dyes and pharmaceuticals to analytical chemistry and optical brighteners. This article delves into the fundamental aspects of Sulfanilic acid, providing valuable insights for B2B professionals looking to understand or procure this essential chemical.

Chemically, Sulfanilic acid is 4-aminobenzenesulfonic acid. Its molecular formula is C6H7NO3S, and it has a molecular weight of 173.19 g/mol. A key property is its zwitterionic nature, meaning it possesses both acidic and basic functional groups, contributing to its high melting point and solubility characteristics. While it has limited solubility in cold water (approximately 0.1 g/100 mL at 20 °C), its salts are generally more soluble.

The primary method for producing Sulfanilic acid involves the sulfonation of aniline. This reaction typically uses concentrated sulfuric acid, leading to the formation of phenylsulfamic acid as an intermediate, which then rearranges under heat to yield Sulfanilic acid. The efficiency and purity of this manufacturing process are critical for ensuring the quality of the final product. NINGBO INNO PHARMCHEM CO.,LTD. leverages advanced manufacturing techniques to produce high-purity Sulfanilic acid, positioning itself as a reliable manufacturer in the market.

The diverse applications of Sulfanilic acid stem from its reactive functional groups. As mentioned, its ability to undergo diazotization makes it indispensable in the synthesis of azo dyes, imparting a wide range of colors used in textiles, inks, and other colorant applications. In the pharmaceutical industry, it serves as a key intermediate for the production of sulfa drugs, a class of antibacterials. Its role as an analytical reagent, particularly for nitrite detection, further underscores its importance in quality control and research settings.

For businesses looking to buy Sulfanilic acid, understanding the market and selecting the right supplier is paramount. NINGBO INNO PHARMCHEM CO.,LTD. is a leading supplier based in China, offering consistent quality and competitive pricing. We provide Sulfanilic acid in bulk quantities, catering to industrial demands. Whether you require it for large-scale dye production, pharmaceutical synthesis, or specialized analytical work, our company is equipped to meet your needs. We encourage potential buyers to request a quote to explore how our reliable supply and quality product can benefit your operations.