Description

Sodium 2,5-Dichloro-4-[4-[[3-[(Ethylphenylamino)Sulphonyl]-p-Tolyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate is a high-purity, water-soluble azo dye intermediate with a complex, functionalized molecular structure. This compound is valued for its role as a key precursor in the synthesis of high-performance dyes and pigments, offering excellent color fastness and stability. It is primarily needed by manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid and durable colorants. Our supply ensures consistent quality and reliable availability for global industrial applications.

Application

• Primary Intermediate for Reactive Dyes: A critical building block in the manufacture of reactive dyes for cotton and other cellulosic fibers.
• Pigment Synthesis: Used in the production of high-performance organic pigments for inks, coatings, and plastics.
• Textile Printing: Serves as a key component in formulations for textile printing pastes, providing bright and wash-fast colors.
• Specialty Chemical Manufacturing: Employed in the synthesis of complex dye molecules for niche applications in electronics and imaging.
• Research & Development: Used in academic and industrial R&D labs for developing new chromophores and functional dyes.

Basic Information

Item	Details
Product Name	Sodium 2,5-Dichloro-4-[4-[[3-[(Ethylphenylamino)Sulphonyl]-p-Tolyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate
CAS No.	71873-38-6
Molecular Formula	C31H26Cl2N5NaO6S2
Molecular Weight	722.58 g/mol
Synonyms	Benzenesulfonic acid, 2,5-dichloro-4-[4-[[3-[(ethylphenylamino)sulfonyl]-4-methylphenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-, sodium salt; Reactive Dye Intermediate; Azo Pyrazolone Dye Intermediate; Sodium Salt of C.I. Reactive Orange; 71873-38-6; 1H-Pyrazole-1-benzenesulfonic acid, 4,5-dihydro-5-oxo-4-[[3-[(phenylamino)sulfonyl]-4-methylphenyl]azo]-3-methyl-, sodium salt (modified); (Technical name variations may apply)
EINECS	Contact for details

Quality Control

Our Sodium 2,5-Dichloro-4-[4-[[3-[(Ethylphenylamino)Sulphonyl]-p-Tolyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure identity, purity, and consistency meet the high standards required for dye synthesis. Certificates of Analysis (COA) detailing key specifications such as assay, impurity profile, and solubility are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	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.