Description

2,7-Dihydroxynaphthalene-3,6-Disulfonicacid is a key sulfonated naphthalene derivative, widely recognized as a versatile intermediate in the synthesis of dyes and pigments. Its value lies in its bifunctional structure, providing reactive sites for coupling and chelation, which is essential for producing colorants with specific properties. This compound is primarily needed by manufacturers in the dye and pigment, specialty chemical, and research sectors for developing azo dyes, optical brighteners, and analytical reagents.

Application

• Azo Dye Intermediate: A crucial coupling component for synthesizing a wide range of acid, direct, and reactive azo dyes.
• Pigment Manufacturing: Used in the production of high-performance organic pigments for inks, plastics, and coatings.
• Optical Brightening Agents (OBAs): Serves as a key building block for fluorescent whitening agents used in paper, textiles, and detergents.
• Analytical Chemistry: Employed as a chelating agent and chromogenic reagent in spectrophotometric analysis for metal ion detection.
• Chemical Research: Utilized as a model compound and intermediate in organic synthesis and materials science research.
• Specialty Chemical Synthesis: Acts as a precursor for sulfonated polymers and other functionalized aromatic compounds.

Basic Information

Product Name	2,7-Dihydroxynaphthalene-3,6-Disulfonicacid
CAS No.	2153-21-1
Molecular Formula	C₁₀H₈O₈S₂
Molecular Weight	320.30 g/mol
Synonyms	2,7-Dihydroxynaphthalene-3,6-disulfonic acid; 3,6-Disulfo-2,7-dihydroxynaphthalene; Chromotropic acid (disodium salt form); 2,7-Naphthalenediol-3,6-disulfonic acid; 4,5-Dihydroxynaphthalene-2,7-disulfonic acid (isomer); Naphthalene-2,7-diol-3,6-disulfonic acid; C.I. 36255; Chromotrope acid
EINECS	218-438-6

Quality Control

Our 2,7-Dihydroxynaphthalene-3,6-Disulfonicacid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity and performance. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided with every shipment to guarantee traceability and consistency for your production processes.

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 acids and organic solvents. The container must be kept tightly sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light beige powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%

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