Description

Disodium 3,6-Dihydroxynaphthalene-2,7-Disulphonate is a high-purity, water-soluble naphthalene derivative widely used as a key intermediate in the synthesis of dyes, pigments, and optical brighteners. Its disulphonate and dihydroxy functional groups make it a versatile building block for creating compounds with specific color and fluorescence properties. This product is essential for manufacturers in the dye, textile, paper, and specialty chemical industries seeking reliable and consistent raw material quality.

Application

• Dye and Pigment Intermediate: A crucial precursor in the synthesis of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Optical Brightening Agent (OBA) Synthesis: Serves as a core intermediate for manufacturing stilbene-based fluorescent whitening agents used in detergents, paper, and textiles.
• Chemical Research & Development: Used as a model compound or starting material in organic synthesis and photochemical research due to its distinct chromophore structure.
• Analytical Reagent: Can be employed as a complexometric agent or a standard in certain analytical chemistry applications.
• Specialty Polymer Additive: Potential use as a monomer or functional additive in the production of specialty polymers requiring sulfonated or hydrophilic characteristics.

Basic Information

Product Name	Disodium 3,6-Dihydroxynaphthalene-2,7-Disulphonate
CAS No.	7153-21-1
Molecular Formula	C10H6Na2O8S2
Molecular Weight	372.23 g/mol
Synonyms	3,6-Dihydroxynaphthalene-2,7-disulfonic acid disodium salt; 2,7-Naphthalenedisulfonic acid, 3,6-dihydroxy-, disodium salt; Disodium 3,6-dihydroxy-2,7-naphthalenedisulfonate; Acid Yellow 1 intermediate; C.I. 10316; Naphthol Yellow S intermediate; Dihydroxynaphthalenedisulfonic acid disodium salt
EINECS	230-486-2

Quality Control

Our Disodium 3,6-Dihydroxynaphthalene-2,7-Disulphonate is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for use in sensitive synthesis processes. Certificates of Analysis (COA) documenting all critical parameters are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The product is hygroscopic; ensure the container is sealed after each use to minimize moisture absorption.

Specification

Item	Specification
Appearance	Yellow to brownish-yellow powder or crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content	≤ 2.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Sulfate Ash	28.0 - 32.0%

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