4273-92-1

Basic information

• Product Name: Naphthol AS-LC
• Synonyms: 4'-Chloro-3-hydroxy-2',5'-dimethoxy-2-naphthanilide;C.I. 37555;C.I. Azoic Coupling Component No. 23;Pigment organic azotol O;C.I.Azoic Coupling Component 23;Anarthol AS-LC;Conazoic BC;Dycosthol AS-LC
• CAS NO: 4273-92-1
• Molecular Formula: C₁₉H₁₆ClNO₄
• Molecular Weight: 357.79
• EINECS: 224-270-6
• Product Categories: Intermediates of Dyes and Pigments;Organics
• Mol File: 4273-92-1.mol
• Article Data: 4

Chemical Properties

• Melting Point: 190°C
• Boiling Point: 479.803 °C at 760 mmHg
• Flash Point: 243.976 °C
• Appearance: light yellow powder
• Density: 1.372 g/cm³
• Vapor Pressure: 0-0Pa at 25℃
• Storage Temp.: Sealed in dry,Room Temperature
• Solubility: Chloroform (Slightly, Heated), DMSO (Slightly)
• PKA: 8.65±0.40(Predicted)
• CAS DataBase Reference: Naphthol AS-LC(CAS DataBase Reference)
• NIST Chemistry Reference: Naphthol AS-LC(4273-92-1)
• EPA Substance Registry System: Naphthol AS-LC(4273-92-1)

Safety Data

• Hazardous Substances Data: 4273-92-1(Hazardous Substances Data)

Usage

Description

Naphthol AS-LC is a light gray powder with a melting point of 188-189°C. It is insoluble in water and sodium carbonate but soluble in pyridine. In sulfuric acid, it forms a yellow solution with a green fluorescence, and in sodium hydroxide solution, it forms a yellow solution. Naphthol AS-LC is characterized by its higher affinity for cotton and medium coupling ability.

Uses

Used in Textile Industry:
Naphthol AS-LC is used as a dyeing agent for cotton fabrics, viscose, silk, polyamide fiber, and polyester. It is primarily utilized in the dyeing process rather than printing and is less commonly applied to cotton yarn. Naphthol AS-LC's higher affinity for cotton makes it a suitable choice for dyeing in this industry.

Preparation

Naphthol AS-LC is synthesized by 4-Chloro-2,5-dimethoxybenzenamine and 3-Hydroxy-2-naphthoic acid condensation.

Upstream product

• 92-70-6 3-Hydroxy-2-naphthoic acid 
• 6358-64-1 4-chloro-2,5-dimethoxy-aniline 

Downstream Products

• 5280-68-2 C_.I_. Pigment Red 146 
• 32179-67-2 Phosphoric acid mono-[3-(4-chloro-2,5-dimethoxy-phenylcarbamoyl)-naphthalen-2-yl] ester 

Relevant articles and documents

Production method and system of naphthol AS series products

The invention discloses a production method and system of naphthol AS series products. The specific steps are as follows: S1, taking chlorobenzene as a solvent for condensation reaction, dehydrating the chlorobenzene, adding the dehydrated chlorobenzene into a reactor, then adding raw material reactants of the naphthol AS series products, heating, raising the temperature, and dropwise adding phosphorus trichloride for condensation reaction; and S2, adding sodium carbonate and water into a distillation kettle, then introducing the condensed material in the S1 into the distillation kettle for heating and distilling, removing the solvent chlorobenzene, filtering the rest material, and carrying out flash evaporation drying on the filter cake to obtain the naphthol AS series products. The raw material reactants of the AS series products comprise a reactant A and a reactant B, wherein the reactant A is 2-hydroxy-3-naphthoic acid, and the reactant B can be o-aminophenetole, 2, 5-dimethoxy-4-chloroaniline, o-aminoanisole, parachloroaniline, o-toluidine, m-nitroaniline, menaphthylamine or 5-aminobenzimidazolone. Differentnaphthol AS series products can be obtained by selecting different reactants B according to needs.

Novel preparation and processing technology of naphthol AS-LC

The invention relates to a novel preparation and processing technology of naphthol AS-LC. The technology comprises the steps of carrying out a reaction in a separating type reaction kettle to obtain a crude product, and then purifying and drying the obtained crude product in a separating type dryer. The invention provides a novel, green and high-yield preparation technology and a simple processing and purification technology. After the method is used, water produced in the reaction process is effectively separated out, an amidation reaction is promoted to continuously move to the right in balance, and the product yield of the naphthol AS-LC is greatly improved by optimizing the reaction conditions. Furthermore, the product is further processed and purified by the novel dryer, so that the purity of the product is improved.