Description

Naphthalene-2,7-Disulfonic Acid CAS NO 92-41-1 is a versatile aromatic sulfonic acid derivative, serving as a critical intermediate in the synthesis of dyes, pigments, and optical brighteners. Its value lies in its dual sulfonic acid groups, which provide excellent water solubility and reactivity for further chemical transformations, enabling the production of high-performance colorants and functional materials. This compound is essential for manufacturers in the dyestuff, textile, and specialty chemical industries seeking reliable, high-purity intermediates for their synthesis processes.

Application

• Dye and Pigment Intermediate: A key building block for the synthesis of acid dyes, direct dyes, and reactive dyes used in textiles, leather, and paper.
• Optical Brightener Production: Used in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, detergents, and textiles.
• Chemical Synthesis: Acts as a sulfonating agent and a precursor for more complex sulfonated aromatic compounds in organic synthesis.
• Research & Development: Employed in academic and industrial R&D for developing new sulfonated polymers and functional materials.
• Surfactant and Dispersant Precursor: Can be further processed to create specialty surfactants or dispersing agents.

Basic Information

Product Name	Naphthalene-2,7-Disulfonic Acid
CAS No.	92-41-1
Molecular Formula	C₁₀H₈O₆S₂
Molecular Weight	288.30 g/mol
Synonyms	2,7-Naphthalenedisulfonic Acid; Naphthalene-2,7-disulphonic Acid; 2,7-NDSA; 2,7-Naphthalene Disulfonate; Acid Naphthalene-2,7-disulfonate; NSC 40326; 1,6-Naphthalenedisulfonic Acid (isomer); Dinaphthol-2,7-disulfonic Acid (related derivative)
EINECS	202-153-8

Quality Control

Our Naphthalene-2,7-Disulfonic Acid is produced under a stringent quality management system to ensure batch-to-batch consistency and high purity. Each lot is analyzed against rigorous in-house specifications, which typically include assay, identification, and impurity profile checks. Certificates of Analysis (COA) documenting the results are provided with every shipment to support your quality assurance and regulatory needs.

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 tightly sealed after opening to prevent absorption of atmospheric moisture. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Sulfate 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.