Description

3-Hydroxynaphthalene-2,6-Disulphonic Acid is a key aromatic sulfonic acid derivative, primarily valued as a versatile intermediate in the synthesis of dyes, pigments, and optical brighteners. Its disulfonated structure provides excellent water solubility and reactivity, making it crucial for creating compounds with specific color and functional properties. This chemical is essential for manufacturers in the dyestuff, textile, and specialty chemical industries seeking reliable, high-purity intermediates for their production processes.

Application

• Dye and Pigment Intermediate: A critical building block for the synthesis of azo dyes, acid dyes, and reactive dyes used in textiles, leather, and paper.
• Optical Brightener Production: Serves as a key precursor in manufacturing stilbene-based optical brightening agents (OBAs) for detergents, papers, and plastics.
• Chemical Synthesis: Used as an intermediate in organic synthesis for creating more complex sulfonated aromatic compounds.
• Research & Development: Employed in laboratory settings for developing new colorants and functional materials.
• Specialty Chemical Manufacturing: Finds application in the production of additives and functional chemicals where sulfonic acid groups are required.

Basic Information

Product Name	3-Hydroxynaphthalene-2,6-Disulphonic Acid
CAS No.	6361-38-2
Molecular Formula	C10H8O7S2
Molecular Weight	304.30 g/mol
Synonyms	2,6-Dihydroxynaphthalene-3,7-disulfonic acid; 3-Hydroxy-2,6-naphthalenedisulfonic acid; 2,6-Naphthalenedisulfonic acid, 3-hydroxy-; R Salt (commercial name); 2-Naphthol-3,6-disulfonic acid; 3-Hydroxy-2,7-naphthalenedisulfonic acid (isomer reference); 3-Hydroxynaphthalene-2,6-disulfonate
EINECS	228-874-9

Quality Control

Our 3-Hydroxynaphthalene-2,6-Disulphonic Acid is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including assay, impurity profile, and physical characterization, to ensure it meets precise specifications for use in sensitive synthesis applications. A Certificate of Analysis (COA) detailing purity, identity, and other critical parameters is provided with every shipment to guarantee traceability and consistency.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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