Description

Trisodium 4-[[7-[(2,4-Diaminophenyl)Azo]-1-Hydroxy-3-Sulphonato-2-Naphthyl]Azo]-4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-2,2'-Disulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex polyazo structure provides excellent chromophore properties, making it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant, colorfast products.

Application

• Primary Intermediate for Direct Dyes: A key building block in the synthesis of high-quality direct dyes for cotton, viscose, and other cellulosic fibers.
• Pigment Manufacturing: Used in the production of organic pigments for printing inks, paints, and plastics, offering good lightfastness and thermal stability.
• Specialty Textile Applications: Enables the creation of deep, complex shades in textile dyeing and printing processes.
• Research & Development: Serves as a valuable chemical entity in R&D laboratories for developing novel colorants and studying azo chemistry.
• Paper Coloring: Employed in the manufacture of dyes for coloring paper and paper products.
• Leather Dyeing: Used in formulations for dyeing leather goods.

Basic Information

Item	Details
Product Name	Trisodium 4-[[7-[(2,4-Diaminophenyl)Azo]-1-Hydroxy-3-Sulphonato-2-Naphthyl]Azo]-4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-2,2'-Disulphonate
CAS No.	6360-43-6
Molecular Formula	C40H24N8Na3O13S3
Molecular Weight	974.81 g/mol
Synonyms	Direct Black 22 (sodium salt); C.I. 35435; Trisodium 4,4'-bis[(7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulphonato-2-naphthyl)azo]biphenyl-2,2'-disulphonate; Direct Black 22; 4,4'-Bis[(7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulphonato-2-naphthyl)azo]biphenyl-2,2'-disulphonic acid trisodium salt; C.I. Direct Black 22; Benzidine Black BN; Direct Deep Black EW
EINECS	228-873-7

Quality Control

Our production of Trisodium 4-[[7-[(2,4-Diaminophenyl)Azo]-1-Hydroxy-3-Sulphonato-2-Naphthyl]Azo]-4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-2,2'-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. The material undergoes comprehensive analytical testing, including HPLC for assay and impurity profiling and spectrophotometric analysis for color strength. A detailed Certificate of Analysis (COA) documenting purity, physical properties, and conformance to agreed specifications is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Solubility (in Water)	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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