Disodium 2-naphthol-3,6-disulfonate, identified by its CAS number 135-51-3, stands as a crucial chemical compound with a wide array of industrial and scientific applications. This organic salt, also known by synonyms such as R-Acid Disodium Salt or Disodium 3-hydroxy-2,7-naphthalenedisulfonate, is a key building block in various synthesis processes, underlining its significance in modern chemistry.

Chemically, Disodium 2-naphthol-3,6-disulfonate possesses the molecular formula C10H6Na2O7S2 and a molecular weight of 348.26. Its typical appearance is that of a colorless and lustrous filament needle crystal, though it can also be found as a white to grayish-brown powder or crystal. This compound exhibits good solubility in water, making it amenable to a variety of aqueous-based applications. While sparingly soluble in solvents like DMSO and methanol, its aqueous solubility is a distinct advantage for its primary uses.

The utility of Disodium 2-naphthol-3,6-disulfonate spans across several critical sectors. One of its primary roles is within the dye industry, where it serves as a vital intermediate for the production of azo dyes. These dyes are widely used for coloring textiles, plastics, and various other materials due to their vibrant colors and stability. Beyond industrial dyes, it is also employed in the formulation of food coloring agents, ensuring the aesthetic appeal of a multitude of food products. Furthermore, its application extends to photographic paper, where its chemical properties contribute to image development processes.

Beyond its contributions to colorants, Disodium 2-naphthol-3,6-disulfonate finds specialized use in analytical studies. Researchers utilize it for the detection of organic explosives and propellants through advanced techniques like fast liquid chromatography quadrupole time-of-flight mass spectrometry. This highlights its importance in forensic science and security applications. Moreover, its properties as a cationic surfactant allow for its application as an inhibitor of corrosion and foaming in the oil industry, protecting valuable equipment and optimizing operational efficiency. It has also demonstrated a linear response with fluorescence techniques when interacting with metal ions, showcasing its potential in advanced material science and detection systems.

Proper handling and storage of Disodium 2-naphthol-3,6-disulfonate are paramount to maintaining its quality and ensuring safety. It is recommended to store this compound in a cool, dry, and well-ventilated place, away from sources of fire, heat, and direct light. It should also be kept separate from strong acids and food materials. While generally stable, it is incompatible with strong oxidizing agents. Safety precautions must be observed during handling, as it can be harmful if swallowed, in contact with skin, or if inhaled, and may cause irritation. Upon decomposition, it can emit toxic fumes, necessitating appropriate ventilation and protective measures.

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