Description

Disodium p-[4-[[4-[[4-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]azo]benzoyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart bright, stable colors and its role in synthesizing complex, high-performance dyes and pigments. It is primarily sought by manufacturers in the textile, ink, and specialty coatings industries for producing vivid yellows and oranges with excellent light and wash fastness properties.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-quality reactive dyes used in cotton and cellulose fiber dyeing and printing.
• Textile Colorant Production: Manufacture of acid and direct dyes for wool, silk, nylon, and paper, offering strong color yield and good solubility.
• Inkjet and Digital Printing Inks: Used in the formulation of specialty inks requiring high color purity, stability, and compatibility with aqueous systems.
• Industrial and Leather Dyes: Production of dyes for leather finishing and other industrial applications demanding durable coloration.
• Liquid Crystal Display (LCD) Color Filters: Potential use in creating color pigments for advanced electronic display applications.
• Research & Development: Serves as a precise chemical reagent in organic synthesis and color chemistry research for developing new chromophores.

Basic Information

Product Name	Disodium p-[4-[[4-[[4-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]azo]benzoyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonate
CAS No.	72829-13-1
Molecular Formula	C34H24N8Na2O10S2
Molecular Weight	806.70 g/mol
Synonyms	Acid Yellow 219; C.I. 19165; Disodium 4,4'-[carbonylbis[(3-sulfo-4,1-phenylene)azo]]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylate]; Benzenesulfonic acid, 4,4'-[carbonylbis[(3-sulfo-4,1-phenylene)azo]]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylate], disodium salt; Reactive Yellow Dye Intermediate; Azo Pyrazolone Dye
EINECS	Contact for details

Quality Control

Our disodium azo dye intermediate is produced under a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for dye synthesis. A Certificate of Analysis (COA) detailing purity, impurity profile, and physical properties is provided with each shipment to guarantee batch-to-batch consistency and performance reliability.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after use to prevent moisture absorption, which can affect purity and handling properties.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content (KF)	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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