Description

3,6-Dihydroxynaphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble aromatic intermediate of significant industrial importance. This compound serves as a critical building block in the synthesis of dyes, pigments, and functional chemicals, valued for its dual hydroxyl and sulphonic acid groups which confer excellent solubility and reactivity. It is primarily sought by manufacturers in the dyestuff, specialty chemical, and research sectors for producing high-performance colorants and advanced organic materials.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Functional Chemical Synthesis: Used in the production of optical brighteners, fluorescent whitening agents, and complexing agents.
• Research & Development: Serves as a versatile starting material in organic synthesis for pharmaceuticals and advanced material science.
• Analytical Reagent: Can be employed as a reagent or standard in analytical chemistry and chromatography.

Basic Information

Product Name	3,6-Dihydroxynaphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	51690-40-5
Molecular Formula	C10H6Na2O8S2
Molecular Weight	372.23 g/mol
Synonyms	3,6-Dihydroxy-2,7-naphthalenedisulfonic Acid Disodium Salt; 2,7-Naphthalenedisulfonic Acid, 3,6-dihydroxy-, Disodium Salt; Disodium 3,6-dihydroxynaphthalene-2,7-disulphonate; Naphthalene-2,7-disulfonic Acid, 3,6-dihydroxy-, Disodium Salt; Acid Brown 14 Intermediate; C.I. 20195
EINECS	257-320-6

Quality Control

Our 3,6-Dihydroxynaphthalene-2,7-Disulphonic Acid, Sodium Salt is manufactured under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity, identity, and performance. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance and regulatory compliance needs.

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). This product is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light brown powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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