Preparation method of cyclohexamine (1)

[Structural formula]

[Physical and chemical properties] Cyclohexamine is also known as amino cyclohexamine; hexahydroaniline

[Preparation]

(1) Atmospheric pressure method for catalytic hydrogenation of aniline

First, aniline is vaporized in the evaporator, and then mixed with hydrogen according to 1:2 (molar ratio) into the catalytic reactor.

(2) Aniline catalytic hydrogenation pressurization method

Using cobalt as catalyst, temperature 240℃, pressure 14.

(3) Phenol catalytic method

Xiao Gang et al.

Select 30 g of γ-Al ₂ O _{3 with} an average pore diameter of 6 to 8 nm and a diameter of φ3 mm, dry and dehydrate at 250° C.

The prepared catalyst is put into a stainless steel integrating reactor with an inner diameter of φ20mm and a height of 600mm, and the upper and lower parts of the catalyst are filled with porcelain rings

Compared with the aniline hydrogenation method commonly used at home and abroad, this method has low cost, and relatively cheap phenol can be used to replace aniline as the raw material for preparing cyclohexamine; the catalyst has high activity and long life; the product selectivity is good, and the yield is high; pollution Small, in line with the principles of green chemical technology

Related links: Physicochemical properties and technical indicators of acetaldoxime