2,7-Naphthalenedisulfonic Acid Disodium Salt丨CAS 1655-35-2

2,7-Naphthalenedisulfonic acid disodium salt is a versatile sulfonated aromatic compound used extensively in the dye, pigment, and chemical industries. It serves as an intermediate in the synthesis of azo dyes, reactive dyes, and fluorescent brighteners due to its water solubility and ability to form stable sulfonate salts. The compound is also applied in the production of polymer additives, dispersants, and surfactants, improving solubility, dispersion, and processability of materials in aqueous systems. Additionally, it finds use in analytical chemistry as a reagent for colorimetric assays and in the synthesis of naphthalene-based functional materials, including resins, chelating agents, and specialty chemicals. Its disodium salt form ensures compatibility with aqueous formulations and enhances its utility in industrial and laboratory processes.

The compound provides several advantages stemming from its sulfonate functionality and aromatic structure. Its high water solubility allows easy incorporation into aqueous systems, facilitating uniform dispersion and stable formulations. The sulfonic acid groups enhance chemical reactivity, enabling efficient coupling with dyes, polymers, and other functional molecules. Its thermal and chemical stability ensures consistent performance during synthesis and in finished products. Additionally, the disodium salt is non-volatile, easy to handle, and compatible with a broad range of reaction conditions, supporting reproducible and high-yield production. Its versatility in modifying both organic and polymeric substrates makes it valuable for industrial, analytical, and research applications.