Description

Sodium 4-[4-[(2,5-Dimethylphenyl)Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate is a high-purity, water-soluble azo pyrazolone dye intermediate. This compound is valued for its consistent chromophore structure, which is critical for producing vivid and stable colorants. It is primarily required by manufacturers in the dye and pigment industries for synthesizing specialized dyes used in textiles, inks, and other colorant applications.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-performance azo dyes, particularly for textile fibers like cotton and nylon.
• Pigment Manufacturing: Used in the production of organic pigments for inks, plastics, and coatings, where color strength and lightfastness are essential.
• Specialty Colorants: Employed in the formulation of specialized colorants for non-textile applications, including paper and leather.
• Research & Development: Utilized in chemical R&D laboratories for developing new dye molecules and studying structure-color relationships.

Basic Information

Product Name	Sodium 4-[4-[(2,5-Dimethylphenyl)Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate
CAS No.	97635-29-5
Molecular Formula	C24H21N4NaO4S
Molecular Weight	484.50 g/mol
Synonyms	Benzenesulfonic acid, 4-[4-[(2,5-dimethylphenyl)azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-, sodium salt; Sodium 1-(4-sulfophenyl)-3-methyl-4-[(2,5-dimethylphenyl)azo]-5-pyrazolone; C.I. Acid Yellow 151; Acid Yellow 151 sodium salt; Azo pyrazolone dye intermediate; 1-(4-Sulfophenyl)-3-methyl-4-[(2,5-dimethylphenyl)azo]-5-pyrazolone sodium salt
EINECS	Contact for details

Quality Control

Our production of Sodium 4-[4-[(2,5-Dimethylphenyl)Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate adheres to stringent quality protocols to ensure batch-to-batch consistency and high purity for industrial synthesis. All materials are tested against rigorous in-house specifications. A Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to support your quality assurance 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 quality and handling properties.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Clear solution

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