Description

4-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-2,2'-Disulpho[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, complex azo dye intermediate of significant commercial importance. Its value lies in its role as a critical precursor for synthesizing high-performance, polyfunctional dyes, particularly direct and reactive dyes known for their excellent wash-fastness and light-fastness properties. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce vibrant and durable colorants.

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.
• Reactive Dye Synthesis: Used in the production of reactive dyes, which form covalent bonds with fibers for exceptional color fastness.
• Leather Dyeing: Employed in the manufacture of dyes for the leather tanning and finishing industry.
• Paper Coloring: Serves as an intermediate for dyes used in specialty paper and paperboard products.
• Ink Formulation: A component in the synthesis of pigments and dyes for various printing inks.
• Research & Development: Used in chemical R&D for developing new chromophores and studying azo dye chemistry.

Basic Information

Product Name	4-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-2,2'-Disulpho[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	83221-65-2
Molecular Formula	C34H24N8O14S4 · xNa
Molecular Weight	Contact for details
Synonyms	Direct Black 22 Intermediate; C.I. 35435 Intermediate; 4-Amino-3-{[4'-[(2,4-diaminophenyl)diazenyl]-[1,1'-biphenyl]-2,2'-disulfonyl-4-yl]diazenyl}-5-hydroxynaphthalene-2,7-disulfonic Acid Sodium Salt; Azo Dye Intermediate 83221-65-2; Sodium 4-amino-3-{[4'-[(2,4-diaminophenyl)azo]-2,2'-disulfo[1,1'-biphenyl]-4-yl]azo}-5-hydroxy-2,7-naphthalenedisulfonate
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high chemical purity. Quality is verified through analytical techniques including HPLC, UV-Vis spectroscopy, and titration methods. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to support your quality assurance and production processes.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Solubility (in Water)	Freely soluble

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