Description

Disodium 7,7'-Iminobis(4-Hydroxynaphthalene-2-Sulphonate) is a high-purity, water-soluble organic salt primarily valued for its role as a key intermediate and functional additive in advanced chemical synthesis. Its molecular structure, featuring dual hydroxynaphthalene sulphonate groups, makes it a versatile building block for creating dyes, optical brighteners, and specialized polymers. This compound is essential for manufacturers in the fine chemicals, specialty dyes, and research sectors seeking consistent quality and reliable supply for their production processes.

Application

• Dye and Pigment Intermediate: A crucial precursor in the synthesis of high-value azo dyes, acid dyes, and reactive dyes for textiles, leather, and paper.
• Optical Brightening Agent (OBA) Synthesis: Serves as a core component in manufacturing stilbene-based fluorescent whitening agents used in detergents, plastics, and paper.
• Chemical Research & Development: Used as a specialized building block in organic synthesis for pharmaceuticals, agrochemicals, and advanced materials.
• Analytical Reagent: Can function as a complexing agent or a chromogenic reagent in specific analytical chemistry applications.
• Polymer Additive: Employed as a functional monomer or additive to impart specific properties like UV absorption or ionic character to polymers.

Basic Information

Product Name	Disodium 7,7'-Iminobis(4-Hydroxynaphthalene-2-Sulphonate)
CAS No.	71786-27-1
Molecular Formula	C₂₀H₁₂NNa₂O₈S₂
Molecular Weight	503.41 g/mol
Synonyms	7,7'-Iminobis(4-hydroxynaphthalene-2-sulfonic acid) disodium salt; Disodium 4,4'-(iminobis(7-hydroxy-2-naphthalenesulfonate)); Disodium 4,4'-Diaminostilbene-2,2'-disulfonate derivative; Blankophor intermediate; Fluorescent Brightener 220 intermediate; DAS-DS (abbrev.); OBA Intermediate
EINECS	Contact for details

Quality Control

Our Disodium 7,7'-Iminobis(4-Hydroxynaphthalene-2-Sulphonate) is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and performance. Certificates of Analysis (COA) documenting key parameters are available upon request 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 sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Yellowish to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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