Product performance of 2-hydroxy-3-naphthoyl o-ethoxyaniline

2-Hydroxy-3-naphthoyl-o-phenetidide (3-hydroxy-2-naphthoyl-o-phenetidide) is also known as naphthol AS-PH (naphthol AS-PH), naphthol AS-PH, the molecular formula is C ₁₉ H ₁₇ NO ₃ , the molecular weight is 307.
35, and the structural formula is

1.

Light yellow powder; melting point 157～158℃; insoluble in water and sodium carbonate solution, soluble in caustic soda solution; toxic
.

2.
Production principle

In a chlorobenzene medium, using phosphorus trichloride as a catalyst, 2-hydroxy-3-naphthoic acid (2,3-acid) is condensed with o-aminophenethyl ether , and the product is obtained after post-treatment
.

3.
Process flow

4.

5.
Main equipment

Condensation reactor, neutralization pot, storage tank, distillation kettle, filter press, dryer
.

6.
Production process

In the condensation reactor, add 1600L chlorobenzene , 460kg 98% 2,3-acid, and then add 30kg 60% phosphorus trichloride chlorobenzene solution (including PCI ₃ 18kg)
.