2-Amino-1-naphthalenesulfonic acid: an indispensable key intermediate for azo dye industry

2-amino -1-naphthalenesulfonic acid (CAS 81-16-3, chemical formula c-h-no-s), as an important naphthalenesulfonic acid intermediate with 223.25 molecular weight, plays an irreplaceable role in the manufacture of azo dyes and azo pigments by virtue of its unique molecular structure advantage-naphthalene ring carries both amino and sulfonic acid groups as active functional groups. This product is a white to pink needle-like crystal, readily soluble in hot water and very slightly soluble in ethanol and ether. It features high purity, bright color, a narrow melting range, and excellent reactivity and compatibility.
From the perspective of core efficacy, 2-amino -1-naphthalene sulfonic acid is mainly used to manufacture series of azo dye intermediates such as J acid (2-amino -5-naphthol -7-sulfonic acid) and γ acid, and is also a key raw material for the synthesis of high-end dyes such as chromophane AS-SW, reactive red K-1613 and organic purple, Lisol purple, Lisol red and other organic pigments. Azo dye systems based on 2-amino-1-naphthalenesulfonic acid feature vivid hues, excellent colorfastness, and a comprehensive color spectrum. They are widely used for the dyeing and printing of cotton, linen, viscose, and other cellulosic fibers, as well as for coloring applications in the coatings, inks, plastics, and rubber industries. As the global textile dyeing and printing industry continues to see growing demand for high-performance dyes, 2-Amino-1-naphthalenesulfonic acid, as a core intermediate in the dye manufacturing value chain, is increasingly recognized for its strategic importance and market value.