Description

7-Aminonaphthalene-1,3-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble aromatic intermediate of significant commercial importance. This compound serves as a critical building block in the synthesis of advanced dyes, pigments, and optical brighteners, valued for its ability to introduce both amino and sulfonate functionalities. It is primarily required by manufacturers in the dyestuff, textile chemical, and specialty chemical industries seeking reliable, high-quality intermediates for their production processes.

Application

• Primary Intermediate for Azo Dyes and Pigments: Acts as a key diazo component or coupling agent in the production of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Synthesis of Optical Brightening Agents (OBAs): Used in the manufacture of fluorescent whitening agents for applications in detergents, plastics, and paper products.
• Production of Sulfonated Naphthalene Derivatives: Serves as a precursor for other sulfonated intermediates used in specialty surfactants and dispersants.
• Chemical Research and Development: Employed in organic synthesis for creating novel compounds with specific functional properties in academic and industrial R&D settings.
• Functional Dye Manufacturing: Utilized in the synthesis of specialized dyes for non-textile applications, including inks and functional materials.

Basic Information

Product Name	7-Aminonaphthalene-1,3-Disulphonic Acid, Sodium Salt
CAS No.	71411-80-8
Molecular Formula	C10H7NNa2O6S2
Molecular Weight	347.27 g/mol
Synonyms	7-Amino-1,3-naphthalenedisulfonic acid disodium salt; 1,3-Naphthalenedisulfonic acid, 7-amino-, disodium salt; 7-Amino-1,3-NDSA disodium salt; Acid Red 337 intermediate; K acid sodium salt; Koch's acid sodium salt derivative; 7-Aminonaphthalene-1,3-disulfonate sodium salt
EINECS	Contact for details

Quality Control

Our 7-Aminonaphthalene-1,3-Disulphonic Acid, Sodium Salt is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and consistency. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided with each shipment to guarantee traceability and compliance with your quality requirements.

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 oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Off-white to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility (1% in Water)	Clear to slightly hazy solution
Heavy Metals (as Pb)	≤ 20 ppm

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