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O-p-cresol (o-amino-p-methylphenol ) , also known as 2-amino-4-methylphenol, 6-hydroxy-3-methyl aniline (6-hydroxy-m-toluidine ), the formula C .
7 H 9 NO, molecular weight is 123.
15, structural formula is
1.
Product performance
White crystal, industrial product is off-white crystal; melting point is 135～137℃; soluble in organic solvents such as ethanol , ether , chloroform , slightly soluble in water, benzene, soluble in hot water: easy to oxidize and change color when exposed to air;
.
2.
Production principle
(1) Catalytic hydrogenation method
.
(2) Sodium sulfide reduction method
.
(3) Iron powder reduction method
.
Here is the third method
.
3.
Process flow
4.
Technical formula (quality, portion)
5.
Main equipment
Nitrification reaction pot, neutralization pot, reduction reaction gold, filter, decolorization pot, crystallization pot, storage tank, drying box
.
6.
Production process
In the nitration reactor, add 78 parts (100%) of nitric acid to 370 parts of water to make 17%-18% dilute nitric acid, cool to 20°C, and slowly add 110 parts of a mixture of p-cresol and water with stirring
.
Due to the exothermic reaction, the jacket of the reaction pot should be cooled by passing water to control the feeding rate so that the nitration reaction is carried out at 25-30°C
The filtrate was adjusted to pH=9 with concentrated hydrochloric acid, then 0.
5 part of sodium hydroxide and 1.
5 parts of activated carbon were added, stirred at 85-90°C for 0.
5h, filtered while hot to remove the activated carbon, and washed with a small amount of hot water
.
The filtrate and the washing liquid are combined and cooled to room temperature, and then crystals are precipitated
.
Filter the crystals, and dry the filter cake at 50-60°C to obtain finished products of o-amino-p-cresol with a content of more than 98%
.
7.
Product Standard
Appearance of off-white to brown granular crystals
8.
Product use
Used as dye intermediates and intermediates of polyester fiber optical brightener DT
.
9.
Safety measures
(1) The raw material is toxic to cresol, and the maximum allowable concentration in the workplace is 22mg/m 3
.
This product is toxic and irritating to the skin
.
Production equipment should be closed and well ventilated
.
Production operators should wear labor protection equipment
.
(2) Packed in iron drum lined with plastic bag and stored in a ventilated and dry place
.
