Description

Disodium 3,3'-[Sulphonylbis[(2-Nitro-p-Phenylene)Imino]]Bis[6-Anilinobenzenesulphonate] is a high-purity, water-soluble organic dye intermediate of significant commercial importance. Its primary value lies in its role as a key precursor for synthesizing reactive and direct dyes, particularly in the production of high-grade, colorfast black and navy blue shades. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce dyes with excellent wash and light fastness properties.

Application

• Primary Intermediate for Reactive Dyes: A crucial building block in the synthesis of high-performance reactive dyes for cotton, viscose, and other cellulosic fibers.
• Direct Dye Production: Used in the manufacture of direct dyes, offering deep, substantive colors for paper, leather, and textile applications.
• Specialty Ink Formulations: Serves as a colorant intermediate in the production of inks for jet printing and other specialty applications requiring specific chromophores.
• Research & Development: Employed in chemical R&D for developing novel chromophores and studying azo dye chemistry and properties.
• Leather Dyeing: Used in the synthesis of dyes for the leather tanning and finishing industry.

Basic Information

Product Name	Disodium 3,3'-[Sulphonylbis[(2-Nitro-p-Phenylene)Imino]]Bis[6-Anilinobenzenesulphonate]
CAS No.	6373-79-1
Molecular Formula	C36H24N6Na2O14S3
Molecular Weight	914.78 g/mol
Synonyms	Disodium 3,3'-[sulfonylbis[(2-nitro-4,1-phenylene)imino]]bis(6-anilinobenzene-1-sulfonate); C.I. Reactive Black 5 Intermediate; Reactive Black 5 Precursor; 4,4'-[Sulfonylbis(2-nitro-4,1-phenylene)imino]bis[5-anilino-2-(sulfooxy)benzenesulfonic acid] disodium salt; Benzenesulfonic acid, 4,4'-[sulfonylbis[(2-nitro-4,1-phenylene)imino]]bis[5-anilino-2-hydroxy-, disodium salt; Direct Black 22 related intermediate
EINECS	228-923-0

Quality Control

Our production of Disodium 3,3'-[Sulphonylbis[(2-Nitro-p-Phenylene)Imino]]Bis[6-Anilinobenzenesulphonate] adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. The material is characterized and tested using advanced analytical techniques including HPLC, UV-Vis, and IR spectroscopy. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to support your quality assurance and regulatory compliance 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, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark blue to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility (1% in Water)	Complete, clear 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.