Description

Disodium 7,7'-(Carbonyldiimino)Bis[3-[(3-Aminophenyl)Azo]-4-Hydroxynaphthalene-2-Sulphonate] is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex molecular structure, featuring multiple azo and sulfonate groups, makes it a critical precursor for synthesizing specialized dyes and pigments with enhanced color fastness and solubility properties. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce high-performance colorants.

Application

• Primary Intermediate for Reactive Dyes: Key starting material for manufacturing high-grade reactive dyes used in cotton and cellulose fiber dyeing.
• Specialty Pigment Synthesis: Used in the production of complex organic pigments for automotive paints, industrial coatings, and plastics.
• Leather Coloring Agent: Serves as a precursor for dyes applied in the leather tanning and finishing industry.
• Inkjet Ink Formulations: Utilized in developing specialized dyes for high-quality photographic and textile inkjet printing.
• Biological Staining Reagents: Potential use in synthesizing stains for histological and cytological applications in laboratories.
• Research & Development: Serves as a valuable chemical entity for academic and industrial R&D in dye chemistry and material science.

Basic Information

Item	Detail
Product Name	Disodium 7,7'-(Carbonyldiimino)Bis[3-[(3-Aminophenyl)Azo]-4-Hydroxynaphthalene-2-Sulphonate]
CAS No.	6420-46-8
Molecular Formula	C40H26N8Na2O11S2
Molecular Weight	888.80 g/mol
Synonyms	Direct Black 22 (disodium salt); C.I. 35435; 7,7'-Urylenedi(4-hydroxy-3-((3-aminophenyl)azo)-2-naphthalenesulfonic acid) disodium salt; 3,3'-((Carbonylbis(imino-7,1-naphthalenediylazo))bis(3-aminobenzene-4,1-diyl))bis(4-hydroxy-2-naphthalenesulfonic acid) disodium salt; Disodium 4-hydroxy-3-((3-aminophenyl)azo)-7-((7-(3-((3-aminophenyl)azo)-4-hydroxy-2-sulfo-1-naphthyl)amino)-7-oxoheptyl)amino)-2-naphthalenesulfonate; Azo Dye Intermediate 6420-46-8
EINECS	229-187-6

Quality Control

Our production of Disodium 7,7'-(Carbonyldiimino)Bis[3-[(3-Aminophenyl)Azo]-4-Hydroxynaphthalene-2-Sulphonate] adheres to a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled 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.

Specification

Item	Specification
Appearance	Dark brown 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
pH (1% Aqueous Solution)	6.0 - 8.0

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