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2-hydroxy-3-naphthoyl-l-naphthylamide (2-hydroxy-3-naphthoyl-l-naphthylamide) is also known as naphthol AS-BO (naphthol AS-BO), 3-hydroxy-N-(1- Naphthyl)-2-naphthylcarboxamide, N-(3-hydroxy-2-naphthoyl)-a-naphthylamine, Naftor AS-BO, molecular formula is C 21 H 15 NO 2 , molecular weight is 313.
36, structural formula for
1.
Product performance
Light beige powder; melting point 222～223°C; soluble in xylene , insoluble in water and soda ash, soluble in sodium hydroxide and yellow; toxic
.
2.
Production principle
First, 2,3-acid and alkali form sodium salt
.
After dehydration, it is condensed with 1-naphthylamine in the presence of phosphorus trichloride , and the product is obtained through post-treatments such as neutralization, desolvation, filtration, and drying
3.
Process flow
4.
Technical formula (kg/t)
5.
Main equipment
Salt dehydration kettle, condensation reaction kettle, distillation kettle, storage tank, filter, washing pot, suction filter, dryer
.
6.
Production process
Add 4000～5000L chlorobenzene , 606kg 98% 2,3-acid and 500L 30% liquid caustic soda into the salt-forming dehydration kettle , heat and dehydrate, and gradually increase the temperature to 134～135℃, and stop when the steamed chlorobenzene is transparent and anhydrous Heating
.
Add chlorobenzene to control the volume of the feed liquid at 2800～3000L
Move the above dehydrated material into the condensation kettle, cool to about 90°C, and add 456kg 1-naphthylamine
.
Continue to cool to about 67°C, and evenly add phosphorus trichloride and chlorobenzene mixture within 2h (the amount of phosphorus trichloride is 225kg, and about 150kg of anhydrous benzene is used to make a mixture at 55-60°C)
Add 2000L of water and 300L of 30% liquid caustic soda in the distillation kettle, and then press in the above-mentioned condensed materials
.
After pressing, continue to stir for 15 minutes, add alkali to adjust the pH to the range of 8.
7.
Product Standards
8.
Product use
It is mainly used as a primer for dyeing and printing of cotton fabrics, and for the production of fast pigments and organic pigments
.
9.
Safety measures
(1) Toxic materials such as 1-naphthylamine , phosphorus trichloride, chlorobenzene, and 2,3-acid are used in production, the equipment should be sealed to prevent leakage.
The operators should wear labor protection equipment and strengthen ventilation in the workshop
.
(2) This product is toxic.
It is packaged in a plastic bag lined with an iron bucket for external use.
It should be stored in a cool, ventilated, and dry warehouse, away from fire, heat, and sun, and avoid heat and moisture
.
Store and transport in accordance with toxic chemicals regulations
.
Related links: Production principle and process flow of 2-hydroxy-3-naphthoanilide
