7-Anilino-4-hydroxy-2-naphthalenesulfonic acid
CAS 119-40-4
EC 204-320-3
Formula C16H13NO4S
MW 315.34 g/mol
Pharmaceutical Intermediates Textile, Leather & PaperPrinting & Packaging Surface Modification & Wetting
Description
7-Anilino-4-hydroxy-2-naphthalenesulfonic acid (CAS 119-40-4) is an aromatic sulfonic acid intermediate commercially known as Phenyl J Acid, Phenyl I Acid, and N-Phenyl I Acid. It carries no assigned E-code and is classified under HS code 2922.29.8190 within the amino-naphthol sulfonic acid family.
In textile and leather processing, Phenyl J Acid serves as a key building block for azo dye synthesis, where its hydroxyl and sulfonic groups direct coupling reactions to produce colorfast dyes with strong substrate affinity. In printing and packaging applications, it contributes to ink formulations where controlled surface wetting behavior is required for consistent pigment dispersion and adhesion.
This material is supplied as a pharmaceutical-grade intermediate and falls under REACH registration requirements for the European market. It is available in standard industrial packaging, and procurement teams should confirm lot-specific purity documentation and SDS compliance prior to ordering.
In textile and leather processing, Phenyl J Acid serves as a key building block for azo dye synthesis, where its hydroxyl and sulfonic groups direct coupling reactions to produce colorfast dyes with strong substrate affinity. In printing and packaging applications, it contributes to ink formulations where controlled surface wetting behavior is required for consistent pigment dispersion and adhesion.
This material is supplied as a pharmaceutical-grade intermediate and falls under REACH registration requirements for the European market. It is available in standard industrial packaging, and procurement teams should confirm lot-specific purity documentation and SDS compliance prior to ordering.
Physical Properties
| Melting Point | 114 °C |
| Density | 1.495±0.06 g/cm3(Predicted) |
| Color | White to Gray to Brown |
| Form | powder to crystal |
| Water Solubility | 587.97mg/L at 25℃ |
| Refractive Index | 1.734 |
| Log P | 0.83 |
Safety & Handling (Learn More)
Warning GHS07
H
H319
P
P280P264+P265P337+P317P305+P351+P338
Trade & Regulatory
| HS Code | 2922.29.8190 |
Other Names
7-anilino-4-hydroxynaphthalene-2-sulfonic acid4-hydroxy-7-(phenylamino)naphthalene-2-sulfonic acidPhenyl I acidPHENYL J ACIDN-Phenyl I acid2-Anilino-5-naphthol-7-sulfonicacid6-ANILINO-1-NAPHTHOL-3-SULFONIC ACID7-ANILINO-4-NAPHTHOL-2-SULFONIC ACID
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Raw Materials
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