Description

2-Naphthylamine-5,7-Disulfonic Acid is a high-purity, multi-sulfonated aromatic amine intermediate of significant industrial importance. Its chemical structure makes it a versatile precursor for the synthesis of complex dyes, pigments, and optical brighteners. This compound is primarily sought after by manufacturers in the specialty chemicals, textile dye, and advanced materials sectors for producing vivid and stable colorants.

Application

• Dye and Pigment Intermediate: A key building block for synthesizing azo dyes, acid dyes, and direct dyes, particularly for textiles like wool, silk, and nylon.
• Optical Brightener Production: Used in the manufacture of fluorescent whitening agents (FWAs) for paper, detergents, and plastics.
• Liquid Crystal Dye Synthesis: Serves as a precursor for dyes used in liquid crystal displays (LCDs) and other electronic applications.
• Research & Development: Employed in organic synthesis and chemical research to create novel sulfonated compounds and study reaction mechanisms.
• Specialty Chemical Manufacturing: Utilized in the production of other fine chemicals, corrosion inhibitors, and photographic chemicals.

Basic Information

Product Name	2-Naphthylamine-5,7-Disulfonic Acid
CAS No.	118-33-2
Molecular Formula	C₁₀H₉NO₆S₂
Molecular Weight	303.31 g/mol
Synonyms	5,7-Disulfo-2-naphthylamine; 2-Amino-5,7-naphthalenedisulfonic Acid; 2-Aminonaphthalene-5,7-disulfonic Acid; 1,6-Cleve's Acid; 6-Amino-1-naphthol-3-sulfonic Acid (tautomer); 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid; 5,7-Disulfonic Acid-2-naphthylamine; 2-Naphthylamine-5,7-disulfonate
EINECS	204-250-6

Quality Control

Our 2-Naphthylamine-5,7-Disulfonic Acid is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise chemical purity and compositional specifications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided with each shipment to guarantee batch-to-batch consistency and support your quality assurance protocols.

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). The product is hygroscopic (moisture-sensitive) and should be kept away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light gray powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
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.