Description

4-Hydroxy-5-(Phenylamino)Naphthalene-2,7-Disulfonic Acid is a specialized naphthalene-based intermediate featuring both sulfonic acid and amino-phenol functional groups, making it a versatile building block for advanced synthesis. This compound is valued for its ability to impart specific chromophoric and complexing properties in high-performance materials. It is primarily utilized by manufacturers in the dye, pigment, and specialty chemical industries for creating complex colorants and functional additives.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of acid dyes, reactive dyes, and high-value pigments, particularly for textiles and inks.
• Complexometric Agent: Used in the formulation of analytical reagents and metal ion chelating agents due to its sulfonic acid groups.
• Photographic Chemicals: Serves as a component in the production of certain photographic chemicals and color couplers.
• Polymer Modification: Employed as a functional monomer or additive to introduce sulfonate groups into polymers for improved solubility or ionic character.
• Research & Development: Used in organic synthesis and chemical research for constructing more complex heterocyclic and aromatic compounds.

Basic Information

Product Name	4-Hydroxy-5-(Phenylamino)Naphthalene-2,7-Disulfonic Acid
CAS No.	213249-11-7
Molecular Formula	C₁₆H₁₃NO₇S₂
Molecular Weight	395.41 g/mol
Synonyms	5-Anilino-4-hydroxynaphthalene-2,7-disulfonic Acid; 4-Hydroxy-5-(phenylamino)-2,7-naphthalenedisulfonic Acid; 5-(Phenylamino)-4-hydroxy-2,7-naphthalenedisulfonic Acid; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-(phenylamino)-; 4-Hydroxy-5-anilino-2,7-naphthalenedisulfonic Acid; N-Phenyl-4-hydroxy-2,7-naphthalenedisulfonic acid-5-imine; Acid Brown 248 intermediate (related)
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-5-(Phenylamino)Naphthalene-2,7-Disulfonic Acid adheres to strict quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and meet customer specifications. Certificates of Analysis (COA) documenting all critical parameters are available upon request.

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 (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 brown to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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