2-Oxohexamethylenimine (2-Oxohexamethylenimine)

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2-Oxohexamethylenimine

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ε-caprolactam
PA 6
epsilon-Caprolactam
hexahydro-2H-azepin-2-one
P 6
Caprolactam
Azepan-2-one
epsilon-caprolactam
hexahydroazepin-2-one
2H-Azepin-2-one, hexahydro-
Itamid
Kapron
Grilon
ε-Caprolactam
2-Oxohexamethylenimine
A1030
CPL
Capron

+Expand -Stow

105-60-2

C6H11NO

113.158

2933710000

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Nature Description

White scales or melts. Melting point 69-71 ℃, boiling point 268.5 ℃(101.3kPa), relative density 1.05 of 70 aqueous solution, refractive index 1.4935(40 ℃), enthalpy of fusion 121.8J/g, evaporation heating 487.2J/g, viscosity 9mPa · s at 78℃. The vapor pressure is 399.9Pa at 100℃, 6.665kPa at 180℃, and 101.3kPa at ℃. Soluble in water; Chlorinated solvent, petroleum hydrocarbon, cyclohexene, benzene, methanol, ethanol, ether. Hygroscopicity.

268oC

68-71oC

152oC

4560G/L(20oC)

Product Applications

It is used to prepare caprolactam resin, caprolactam fiber and artificial leather, and is also used as a pharmaceutical raw material.

Production method

In 1943, the German French company first realized the industrial production of caprolactam through the synthesis of cyclohexanone-hydroxylamine (now referred to as oxime method). With the development of synthetic fiber industry, toluene method (ANIA method), photonitrosation method (PNC method), caprolactone method (UCC method), cyclohexane nitration method and cyclohexanone nitration method have appeared successively. The newly developed cyclohexanone ammoniation oxidation method has attracted people's attention because it does not need to use hydroxylamine for cyclohexanone oxime in the production process and has a simple process. 1. Oxime method firstly condenses high purity cyclohexanone with hydroxylamine sulphate at 80-110 ℃ to generate cyclohexanone oxime. The separated cyclohexanone oxime uses fuming sulfuric acid as catalyst and translocates to crude caprolactam through Beckman rearrangement at 80-110 ℃. Crude caprolactam is prepared by extraction, distillation, crystallization and other processes to obtain high purity caprolactam. Cyclohexanone, the raw material of oxime method, can be obtained from the hydrogenation of phenol to cyclohexanol, then from the dehydration, or from the air oxidation of cyclohexane to generate cyclohexanol and cyclohexanone. The separated cyclohexanol is also generated from the catalytic dehydration of cyclohexanone. 2. Toluene method toluene is oxidized to benzoic acid under the action of cobalt salt catalyst. Benzoic acid is hydrogenated in liquid phase with palladium catalyst on activated carbon carrier to generate hexahydrobenzoic acid. In fuming sulfuric acid, hexahydrobenzoic acid reacts with nitrosyl sulfuric acid to form caprolactam. Toluene process has a certain development prospect due to its abundant toluene resources and low production cost. 3. Photo-nitrosation cyclohexane reacts with chloronyl under the irradiation of mercury vapor lamp and directly converts it into cyclohexanone oxime hydrochloride. Cyclohexanone oxime hydrochloride is converted into caprolactam through Beckman rearrangement in the presence of fuming sulfuric acid. 4. Phenol process phenol is hydrogenated in the presence of nickel catalyst to produce cyclohexanol, After purification, the crude cyclohexanone was dehydroized. Cyclohexanone is purified and reacted with hydroxylamine to obtain cyclohexanone oxime, and then transferred by Beckman to form caprolactam. Sulfuric acid in the reaction product is neutralized with ammonia to obtain thiamine, a by-product. Crude caprolactam is purified by a series of chemical and physical treatments.

Security

Dangerous Goods Marking： Xn

Safety instructions： S2: Store it out of reach of children.

Hazardous material category code： R20/22: Harmful by inhalation and accidental swallowing. R36/37/38: it can irritate eyes, respiratory tract and skin.

Dangerous goods transportation number： UN2811

Symbols： GHS07

Storage conditions： Store in a cool and ventilated warehouse. Keep away from fire and heat source. It should be stored separately with oxidant, alkali and edible chemicals, and should not be mixed. Equipped with corresponding varieties and quantities of fire fighting equipment. The storage area should be equipped with appropriate materials to accommodate leaks.

Cautionary Statement： P261-P305 + P351 + P338

Hazard Statement： H302 + H332-H315-H319-H335