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2-hydroxypyridine-N-oxide (HOPO)

Physicochemical property

Melting point: 52-54 °C (lit.)

Boiling point: 238 °C (lit.)

Density: 1.392 g/mL at 25 °C (lit.)

Refractive index: n20/D 1.5382

Flash point: 223 °F

Solubility: insoluble in water, soluble in ethanol, ether and benzene.

Properties: Light yellow rhombic hexagonal crystal.

Vapor pressure: 5 mm Hg (85 °C)

Specification index

Specification Unit Standard
Appearance   Yellowish solid
Main content % ≥99.0%
Moisture % ≤0.1

 

Product Application

It is an important chemical raw material, mainly used as an intermediate of pesticide, dye, medicine, plastic and synthetic fiber auxiliaries. Such as herbicide chloromyron, etc., can also manufacture p-toluidine, p-nitrobenzoic acid, p-nitrotoluene sulfonic acid, 2-chloro-4-nitrotoluene, 2-nitro-4-methylaniline, dinitrotoluene and so on.

production

The preparation method is to add toluene to the nitrification reactor, cool it to below 25℃, add the mixed acid (nitric acid 25% ~ 30%, sulfuric acid 55% ~ 58% and water 20% ~ 21%), the temperature rises, adjust the temperature not to exceed 50℃, continue to stir for 1 ~ 2 hours to end the reaction, stand for 6h, the generated nitrobenzene separation, washing, alkali washing, and so on. Chemicalbook crude nitrotoluene contains o-nitrotoluene, p-nitrotoluene and m-nitrotoluene. The crude nitrotoluene is distilled in vacuum, most of the o-nitrotoluene is separated, the residual fraction containing more p-nitrotoluene is separated by vacuum distillation, and the p-nitrotoluene is obtained by cooling and crystallization, and the meta-nitrobenzene is obtained by distillation after accumulation in the mother liquor during the separation of the para.

Specification and storage

galvanized drum 200kg/drum; Packing according to customer's requirements. Cool and ventilated, away from fire, heat source, prevent direct sunlight, avoid light.


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