Description

4-Aminobenzoyl-5-Hydroxynaphthalene-1,7-Disulphonic Acid is a specialized organic intermediate featuring a naphthalene disulfonic acid core functionalized with both amino and hydroxyl groups. This compound matters for its role as a key building block in the synthesis of high-value, complex dyes and pigments, particularly azo dyes, where it contributes to color strength and specific light-fastness properties. Industrial manufacturers and R&D laboratories in the fine chemicals, textile dye, and advanced materials sectors require this high-purity intermediate to develop products with precise chromatic and performance characteristics.

Application

• Primary Intermediate for Azo Dyes: Serves as a crucial diazo component or coupling agent in the production of acid, direct, and reactive dyes for textiles, leather, and paper.
• Functional Dye Synthesis: Used in the manufacture of specialized dyes for inks, lasers, and liquid crystal displays (LCDs) due to its specific sulfonic acid substitution pattern.
• Pigment Manufacturing: Acts as a precursor in the synthesis of organic pigments requiring high thermal stability and weather resistance.
• Chemical Research & Development: Employed in academic and industrial R&D for exploring new chromophores and functional materials.
• Analytical Reagent: Can be utilized as a standard or reagent in analytical chemistry for method development and calibration.

Basic Information

Product Name	4-Aminobenzoyl-5-Hydroxynaphthalene-1,7-Disulphonic Acid
CAS No.	71436-93-6
Molecular Formula	C₁₇H₁₃NO₈S₂
Molecular Weight	423.42 g/mol
Synonyms	5-Hydroxy-4-[(4-aminobenzoyl)amino]naphthalene-1,7-disulfonic acid; 1,7-Naphthalenedisulfonic acid, 5-hydroxy-4-[(4-aminobenzoyl)amino]-; 4-Amino-N-(5-hydroxy-1,7-disulfo-2-naphthyl)benzamide; 4-Aminobenzamido-5-hydroxynaphthalene-1,7-disulfonic acid; Azo dye intermediate 71436-93-6; 5-Hydroxy-4-(4-aminobenzamido)naphthalene-1,7-disulfonic acid
EINECS	Contact for details

Quality Control

Our production of 4-Aminobenzoyl-5-Hydroxynaphthalene-1,7-Disulphonic Acid adheres to a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with agreed specifications. Certificates of Analysis (COA) documenting all critical parameters are provided with each shipment and 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Light yellow to brown 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

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