Description

2-Hydroxynaphthalene-1,4-Disulphonic Acid is a key aromatic sulfonic acid derivative, primarily valued as a versatile intermediate in the synthesis of dyes, pigments, and other fine chemicals. Its bifunctional structure, featuring both hydroxyl and sulfonic acid groups, makes it a critical building block for creating complex molecules with specific color and solubility properties. This compound is essential for manufacturers in the dyestuff, textile, and specialty chemical industries seeking to develop high-performance colorants and functional additives.

Application

• Dye and Pigment Intermediate: A crucial precursor in the manufacturing of azo dyes, acid dyes, and reactive dyes for textiles, leather, and paper.
• Chemical Synthesis: Serves as a key building block for producing more complex naphthalene-based sulfonates and other fine chemicals.
• Surfactant and Dispersant Production: Used in the synthesis of naphthalene sulfonate condensates, which are effective dispersants in concrete admixtures and agrochemical formulations.
• Photographic Chemicals: Can be utilized in the production of certain photographic developers and chemicals.
• Research & Development: Employed in organic synthesis and chemical research for developing new materials and studying sulfonation chemistry.

Basic Information

Product Name	2-Hydroxynaphthalene-1,4-Disulphonic Acid
CAS No.	85895-99-4
Molecular Formula	C₁₀H₈O₇S₂
Molecular Weight	304.30 g/mol
Synonyms	1,4-Dihydroxynaphthalene-2-sulfonic acid; 1,4-Dihydroxy-2-naphthalenesulfonic acid; 2-Naphthol-1,4-disulfonic acid; Chromotropic acid (Note: This name is more commonly associated with the 1,8-isomer, but may be used); 1,4-Dihydroxynaphthalene-2-sulphonic acid; 4-Hydroxy-3-sulfo-1-naphthol; NSC 403119
EINECS	Contact for details

Quality Control

Our 2-Hydroxynaphthalene-1,4-Disulphonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity and meets the specifications required for industrial synthesis. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical characteristics 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, and well-ventilated area. Due to its hygroscopic (moisture-sensitive) nature and strong acid properties, the container must be kept tightly sealed to prevent absorption of atmospheric moisture and contamination. Keep away from incompatible materials such as strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light tan crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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