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2-hydroxy-3-naphthanilide (2-hydroxy-3-naphthanilide) is also known as naphthol AS (naphthol AS), Naftor AS, 3-hydroxy-2-naphthanilide, the molecular formula is C 17 H 13 NO 2 , the molecular weight is 263.
28, and the structural formula is
1.
Product performance
Beige or light red crystal; melting point 243～244℃; soluble in organic solvents such as methanol , ethanol , pyridine, dioxane , hot nitrobenzene, insoluble in water and soda ash, its sodium salt can be dissolved in water, and its alkali solution Yellow; poisonous
.
2.
Production principle
2-Hydroxy-3-naphthoic acid (2,3-acid) is condensed with aniline using phosphorus trichloride as a catalyst in a chlorobenzene medium, and the product is obtained after post-treatment
.
3.
Process flow
4.
Technical formula (kg/t)
5.
Main equipment
Condensation reactor, distillation kettle, hydrogen chloride absorption pot, storage tank, filter, dryer
.
6.
Production process
Add 1500L of chlorobenzene and 600kg of 2,3-acid to the condensation kettle, and then add 1/8 of the total amount of phosphorus trichloride and chlorobenzene mixture (the total amount of phosphorus trichloride is 188kg, and about 125kg of anhydrous chlorobenzene is used Prepared into 55%～60% mixture)
.
Heat to 65°C, add 320kg of aniline, raise the material to 70°C, and stabilize at about 72°C
Add 2000L of water and 158kg of soda ash into the distillation kettle, and press in the above condensed materials under stirring
.
Stir for 15 minutes to control the pH of the liquid material to be above 8
7.
Laboratory preparation method
300 mL of chlorobenzene, 75 g of 2-hydroxy-3-naphthoic acid and 38 g of aniline were added to the three-necked reaction flask
.
Under stirring, a mixture of 23.
8.
Product Standard
9.
Product use
Dye color base
.
Used as a primer for dyeing and printing of cotton fabrics, such as yellow when coupled with yellow base GC, orange when coupled with orange base GC, red when coupled with big red base RC or red base KB, and coupling with big red base G The national flag is red.
It is blue when coupled with blue base VB or blue base BB, when coupled with red base RC is sauce red, and when coupled with maroon base GBC, it is maroon red
10.
Security measures
(1) The raw material aniline is highly toxic, phosphorus trichloride is a first-grade inorganic acid corrosive substance, and chlorobenzene is toxic
.
The reaction equipment should be sealed to prevent leakage, and the HCl produced by the condensation reaction should be absorbed by water
(2) The product is poisonous.
It is packed in plastic bags, external plywood drums or iron drums.
Stored in a cool, ventilated and dry warehouse, away from fire, heat sources, sunlight, and heat and moisture
.
Store and transport in accordance with toxic chemicals regulations
