Production principle of 2-hydroxy-3-naphthoyl o-anisidine

2-hydroxy-3-naphthoyl-o-anisidide (2-hydroxy-3-naphthoyl-o-anisidide) is also known as naphthol AS-OL (naphthol AS-OL), naphthol AS-OL, 2-hydroxyl -3-Naphthoyl is substituted for o-methoxyaniline, the molecular formula is C ₁₈ H ₁₅ NO ₃ , the molecular weight is 293.
32, and the structural formula is

1.
Product performance

Beige powder; melting point 167～168°C; insoluble in water, slightly soluble in sodium bicarbonate , soluble in ethanol , soluble in caustic soda, showing a fluorescent yellow solution; toxic
.

2.
Production principle

2-Hydroxy-3-naphthoic acid (2,3-acid) is dehydrated after forming a salt with sodium carbonate in chlorobenzene
.

3.

4.
Technical formula (kg/t)

5.

Salt dehydration pot, condensation reaction kettle, storage tank, distillation kettle, suction filter, dryer
.

6.
Production process

In the salt-forming dehydration pot, first add 4200L of solvent chlorobenzene, then add 640kg of 2,3-acid and 280kg of sodium carbonate , and heat to about 45°C
.

Move the chlorobenzene solution of sodium 2,3-sodium to the condensation kettle, cool to about 90°C, and add 423 kg of anthranil
.

Add 1000L of water and 330L of 30% liquid caustic soda into the still, and then press the above condensate into it
.