Description

Disodium 7-[(3-Aminobenzoyl)Amino]-4-Hydroxy-3-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for synthesizing specific, high-performance dyes and pigments, particularly those requiring a stable diazo component and enhanced solubility. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid and durable colorants.

Application

• Primary intermediate for the synthesis of acid dyes and direct dyes used in textile coloration, especially for polyamide (nylon) and protein fibers (wool, silk).
• Key building block in the production of reactive dyes, where its sulphonate groups improve water solubility and fiber affinity.
• Used in the manufacture of pigments and lakes for inks, coatings, and plastics, contributing to color strength and stability.
• Intermediate for specialty dyes used in biological staining, histology, and analytical chemistry applications.
• Potential use in the research and development of functional dyes for non-textile applications, such as in optical materials or sensors.

Basic Information

Product Name	Disodium 7-[(3-Aminobenzoyl)Amino]-4-Hydroxy-3-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate
CAS No.	5979-31-7
Molecular Formula	C29H20N6Na2O8S2
Molecular Weight	690.61 g/mol
Synonyms	7-[(3-Aminobenzoyl)amino]-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid, disodium salt; C.I. Acid Yellow 99; Disodium 4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-7-[(3-aminobenzoyl)amino]-2-naphthalenesulfonate; Acid Leather Yellow PG; Amido Yellow E-3GL; Supranol Yellow GW; Dye Intermediate for Acid Yellow 99; Azo Dye Intermediate 5979-31-7
EINECS	227-796-6

Quality Control

Our production of this dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and high chemical purity. Quality is verified through multiple analytical techniques including HPLC, UV-Vis spectroscopy, and titration methods. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to support your quality assurance and R&D 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 (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect purity and handling properties.

Specification

Item	Specification
Appearance	Yellow to Orange-Brown Powder
Identification (IR)	Conforms to Structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility in Water	Freely Soluble

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