Description

3-Hydroxynaphthalene-2,7-Disulphonic Acid is a key aromatic sulfonic acid derivative, primarily serving as a versatile intermediate in the synthesis of dyes and pigments. Its molecular structure, featuring both hydroxyl and sulfonic acid groups, makes it a critical building block for creating azo dyes and other colorants with specific properties like brightness and wash-fastness. This compound is essential for manufacturers in the dye and chemical intermediate industries seeking reliable, high-purity raw materials for their production processes.

Application

• Primary Intermediate for Azo Dyes: A crucial coupling component in the manufacture of acid, direct, and reactive azo dyes, imparting color to textiles, leather, and paper.
• Pigment Synthesis: Used in the production of organic pigments for inks, plastics, and coatings, where color stability and intensity are required.
• Chemical Synthesis Building Block: Serves as a starting material or intermediate for more complex specialty chemicals, including fluorescent whitening agents and optical brighteners.
• Research & Development: Utilized in laboratory settings for developing new dye molecules and studying sulfonation chemistry.

Basic Information

Product Name	3-Hydroxynaphthalene-2,7-Disulphonic Acid
CAS No.	148-75-4
Molecular Formula	C₁₀H₈O₇S₂
Molecular Weight	304.30 g/mol
Synonyms	2,7-Naphthalenedisulfonic acid, 3-hydroxy-; 3-Hydroxy-2,7-naphthalenedisulfonic acid; R acid (principal common name); 2,7-Dihydroxynaphthalene-3,6-disulfonic acid (isomer reference); 3-Hydroxynaphthalene-2,7-disulfonic acid; 3-Hydroxy-2,7-naphthalenedisulphonic acid; R-Acid; 3-Hydroxy-2,7-naphthalenedisulfonate
EINECS	205-730-3

Quality Control

Our 3-Hydroxynaphthalene-2,7-Disulphonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing assay, related substances, and physical parameters is provided with every shipment to guarantee consistency and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and strong bases.

Specification

Item	Specification
Appearance	Off-white to light gray powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 2.0%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.