Description

4-Hydroxy-5-[(Phenylsulphonyl)Amino]Naphthalene-2,7-Disulphonic Acid is a specialized naphthalene-based disulfonic acid derivative, valued for its role as a key intermediate in the synthesis of high-performance dyes and pigments. Its molecular structure provides excellent chromophoric and auxochromic properties, making it critical for achieving specific color characteristics and fastness. This compound is primarily sought by manufacturers in the dye and pigment industry, as well as by research institutions developing advanced colorants and functional materials.

Application

• Primary Intermediate for Dyes & Pigments: A crucial building block in the synthesis of acid dyes, direct dyes, and reactive dyes, particularly for textiles like wool, silk, and nylon.
• Functional Colorant Production: Used in the manufacture of pigments and dyes requiring specific light-fastness, wash-fastness, and chemical resistance properties.
• Research & Development: Serves as a key starting material in organic synthesis for developing novel chromophores and photoactive compounds in academic and industrial R&D labs.
• Specialty Chemical Synthesis: Employed as an intermediate for producing other sulfonated aromatic compounds used in various industrial processes.
• Analytical Reagent: Can be utilized as a standard or reagent in analytical chemistry for method development and calibration.

Basic Information

Product Name	4-Hydroxy-5-[(Phenylsulphonyl)Amino]Naphthalene-2,7-Disulphonic Acid
CAS No.	83-22-7
Molecular Formula	C₁₆H₁₃NO₉S₃
Molecular Weight	483.47 g/mol
Synonyms	5-[(Phenylsulfonyl)amino]-4-hydroxynaphthalene-2,7-disulfonic acid; 4-Hydroxy-5-(phenylsulfonylamino)naphthalene-2,7-disulfonic acid; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-[(phenylsulfonyl)amino]-; 5-Amino-4-hydroxy-2,7-naphthalenedisulfonic acid phenylsulfone; N-(4-Hydroxy-2,7-disulfo-1-naphthyl)benzenesulfonamide; Acid Yellow 76 intermediate; C.I. 18850
EINECS	201-464-1

Quality Control

Our production of 4-Hydroxy-5-[(Phenylsulphonyl)Amino]Naphthalene-2,7-Disulphonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and meet the precise requirements of our industrial partners. Certificates of Analysis (COA) documenting all critical parameters are provided with each shipment to guarantee traceability and support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Due to its hygroscopic (moisture-sensitive) nature, store in a cool, dry, and well-ventilated area. Recommended storage temperature is between 15°C and 25°C. Keep away from strong acids and organic solvents. The container should be kept tightly sealed when not in use to prevent absorption of moisture from the atmosphere.

Specification

Item	Specification
Appearance	Light yellow to brown powder or crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%

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