Description

Naphthalene-1,7-Disulfonic Acid is a key aromatic sulfonic acid derivative, primarily serving as a versatile intermediate in the synthesis of more complex chemical structures. Its value lies in its dual sulfonic acid groups, which provide excellent water solubility and reactivity for further functionalization, making it a critical building block for high-value products. This compound is essential for manufacturers in the dye, pigment, and specialty chemical industries seeking to produce naphthalene-based dyes, optical brighteners, and pharmaceutical intermediates.

Application

• Dye and Pigment Intermediate: A crucial precursor for the synthesis of acid dyes, direct dyes, and reactive dyes, particularly azo dyes, where it provides solubility and chromophore structure.
• Optical Brightener Production: Used in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, textiles, and detergents.
• Pharmaceutical Synthesis: Acts as a building block for certain sulfonamide drugs and other active pharmaceutical ingredients (APIs) requiring a naphthalene disulfonate backbone.
• Chemical Intermediate: Serves in organic synthesis for further reactions such as hydrolysis, salt formation, or coupling to create specialty surfactants and complexing agents.
• Research & Development: Employed in laboratory settings for method development and as a standard in analytical chemistry.

Basic Information

Product Name	Naphthalene-1,7-Disulfonic Acid
CAS No.	5724-16-3
Molecular Formula	C₁₀H₈O₆S₂
Molecular Weight	288.30 g/mol
Synonyms	1,7-Naphthalenedisulfonic Acid; Naphthalene-1,7-disulphonic Acid; 1,7-NDSA; 4,8-Dihydroxynaphthalene-1,5-disulfonic Acid (tautomer); NSC 40319; 1-Naphthol-3,7-disulfonic Acid (related derivative); 1,7-Dihydroxynaphthalene-3,6-disulfonic Acid (isomer); Peri Acid derivative
EINECS	227-246-6

Quality Control

Our Naphthalene-1,7-Disulfonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency and meets high-purity standards suitable for industrial synthesis. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and compliance with your specifications.

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. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light beige crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Residue on Ignition	≤ 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.