Naphthol AS Property

Melting point:

246-248 °C(lit.)

Boiling point:

406.53°C (rough estimate)

Density 

1.1138 (rough estimate)

refractive index 

1.4500 (estimate)

storage temp. 

Refrigerator

solubility 

Insoluble in water; sparingly soluble in ethanol

Colour Index 

37505

form 

Powder

pka

9.70(at 25℃)

color 

Beige

PH Range

Non& uorescence (8.2) to yellow/green & uorescence (10.3)

λmax

394nm

Major Application

Sensors, recording materials, photovoltaic cells, copying materials, photoreceptors, lithographic printing plates, inks, toner, paints, textiles, detecting cancer

CAS DataBase Reference

92-77-3(CAS DataBase Reference)

EPA Substance Registry System

3-Hydroxy-2-naphthanilide (92-77-3)

Safety

Hazard Codes 

Xi,N

Risk Statements 

43-51/53

Safety Statements 

36/37-61

RIDADR 

UN 3077 9/PG 3

WGK Germany 

1

RTECS 

QJ1897400

F 

10-21

HazardClass 

9

PackingGroup 

III

HS Code 

29242990

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H317May cause an allergic skin reaction

H319Causes serious eye irritation

H411Toxic to aquatic life with long lasting effects

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P272Contaminated work clothing should not be allowed out of the workplace.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P391Collect spillage. Hazardous to the aquatic environment

P501Dispose of contents/container to..…

Naphthol AS Chemical Properties,Usage,Production

Description

Naphtol AS is a coupling agent in cotton dying. Occupational dermatitis was reported in a woman involved in needlework, probably sensitized from occupational contact with clothes.

Chemical Properties

beige powder

Uses

Naphtol AS was used as off-the-shelf color-based anion sensors in organic solvents.

Preparation

aniline and 3-Hydroxy-2-naphthoic acid?condensation.

Hazard

Low toxicity by ingestion.

Contact allergens

Naphthol AS is a coupling agent in cotton dyeing, inducing occupational dermatitis or contact allergy in consumers in contact with cotton-dyed clothing. It has been indirectly reported as a cause of occupational allergy due to its coupling with Diazo Component 51, or as a crosssensitizer or sensitizer associated with Pigment Red 23 in red parts of tattoos. Pigmented contact dermatitis is usual in patients with a high phototype.

Purification Methods

Crystallise it from xylene or AcOH which forms plates m 243-244o [Schnopper et al. Anal Chem 31 1542 1959]. [Beilstein 12 H 505.]

Properties and Applications

rice or small red powder, melting point of 243 ~ 244 ℃, more sensitive to the air. In sodium hydroxide solution for yellow in liquid, insoluble in water and sodium carbonate solution, slightly soluble in ethanol, soluble in hot the difficulties. This product is widely used in the cotton fabric dyeing and printing. Dyeing cotton, cotton affinity is low, medium coupled ability. Can also be used for cotton yarn, polyester/cotton, PVA, viscose, silk and vinegar fiber dyeing, also can undertake direct printing, and reactive dye printing and cotton fabrics with the dye printing, discharge printing, the reactive dyes color printing and dyeing, and used to make quick pigment, fast amine element, element and organic pigment fast sulfonylurea medications.