Production method for preparing cyclohexylamine from phenylamine

A technology for the preparation and production of aniline, applied in the field of production and preparation of cyclohexylamine, can solve the problems of unstable control of reaction parameters, difficult recovery of catalysts, and high cost of equipment and equipment, and achieves increased product added value, large production capacity, and staff ratio. less effect

Active Publication Date: 2013-10-16
BINZHOU YUNENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the previous process, in addition to the active components of the catalyst, the process conditions of the reaction, including reaction temperature, reaction pressure, reaction ratio, reaction space velocity and many other factors will have a greater impact on the yield of the product, and the catalyst is difficult to recover , the process operation is complicated, the cost of equipment is high, and the control of reaction parameters is unstable

Method used

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  • Production method for preparing cyclohexylamine from phenylamine
  • Production method for preparing cyclohexylamine from phenylamine

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Experimental program
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Effect test

Embodiment 1

[0027] A production method for preparing cyclohexylamine from aniline. The specific steps are: the aniline is pumped to the aniline heat exchanger and preheated to 160°C, and then enters the vaporizer in the same direction as the hydrogen preheated to 140°C through the hydrogen heat exchanger, and the vaporized The temperature is 150°C, the pressure is 0.03Mpa, and the molar ratio of aniline to hydrogen is 1:15. After the aniline is completely vaporized, it enters the superheater. , in CuO / NiO / γ-Al 2 o 3 React in the presence of a catalyst, the reaction temperature is 160°C, the pressure is 0.03MPa, the reaction time is 3s-4s, and cyclohexylamine is generated; the mixed gas from the reaction bed returns to the hydrogen heat exchanger and aniline heat exchanger for heat exchange and cooling, and then enters The condenser is condensed to below 50°C, wherein the condensed liquid phase enters the crude product tank, the purity of the crude product is 96%, non-condensable gas (H ...

Embodiment 2

[0029] The production method for preparing cyclohexylamine from aniline is controlled by DCS. The specific steps are as follows: aniline is pumped to the aniline heat exchanger to be preheated to 180°C, and then enters in the same direction as the hydrogen preheated to 170°C by the hydrogen heat exchanger. Vaporizer, the vaporization temperature is 180°C, and the pressure is 0.04Mpa. The function of vaporization is to change the material from liquid to gas. The purpose is to fully contact with the catalyst and increase the contact area with the catalyst to make the reaction more complete and the conversion rate higher.

[0030] The molar ratio of aniline to hydrogen is 1:20. After the aniline is completely vaporized, it enters the superheater. The temperature of the superheater is 180°C and the pressure is 0.04Mpa. The function of the superheater is to fully vaporize the liquid.

[0031] After being heated by heat conduction oil, it enters the reaction bed, and in CuO / NiO / γ-Al ...

Embodiment 3

[0033]The production method for preparing cyclohexylamine from aniline is controlled by DCS. The specific steps are: aniline is pumped to the aniline heat exchanger to be preheated to 170°C, and then enters in the same direction as the hydrogen preheated to 160°C by the hydrogen heat exchanger. Vaporizer, the vaporization temperature is 170°C, and the pressure is 0.04Mpa. The function of vaporization is to change the material from liquid to gas. The purpose is to fully contact with the catalyst and increase the contact area with the catalyst to make the reaction more complete and the conversion rate higher.

[0034] The molar ratio of aniline to hydrogen is 1:18. After the aniline is completely vaporized, it enters the superheater. The temperature of the superheater is 170°C and the pressure is 0.035Mpa. The function of the superheater is to fully vaporize the liquid.

[0035] After being heated by heat conduction oil, it enters the reaction bed, and in CuO / NiO / γ-Al 2 o 3 Rea...

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Abstract

The invention belongs to the technical field of the production and preparation of cyclohexylamine and particularly relates to a production method for preparing cyclohexylamine from phenylamine. Through controlling parameters, such as time, temperature, pressure and the like, of all steps, the yield of cyclohexylamine products is high and is over 98%, the quality is stable, the yield is high, the production capacity is large, the side reactions are few, a small amount of byproduct dicyclohexylamine produced during reaction can be recovered and purified, and the added value of the products is increased; and through engineering calculation and advanced DCS (Distributed Control System) control, the parameters are stable and are little in fluctuation, and qualified materials in a negative pressure tower are directly transferred to a rectification tower from the negative pressure tower through pressure difference between the negative pressure tower and the rectification tower, so that the working procedure is efficient and energy-saving, the continuous rectification procedure is completed, the continuity of the whole process is strong, the degree of automation is high, the staff ratio is low, the unit consumption is low, and the yield is high.

Description

technical field [0001] The invention belongs to the technical field of production and preparation of cyclohexylamine, in particular to a production method for preparing cyclohexylamine from aniline. Background technique [0002] Aniline is a compound in which one of the hydrogen atoms in the benzene molecule is replaced by an amino group. Molecular formula C 6 h 5 NH 2 . It is the simplest primary aromatic amine. Colorless oily liquid. Melting point -6.3°C, boiling point 184°C, relative density 1.02 (20 / 4°C), relative molecular weight 93.128, decomposes when heated to 370°C. Slightly soluble in water, easily soluble in organic solvents such as ethanol and ether. Turns brown when exposed to air or sunlight. It can be distilled with steam, and a small amount of zinc powder is added during distillation to prevent oxidation. The purified aniline can be added with 10-15ppm of NaBH4 to prevent oxidative deterioration. [0003] Cyclohexylamine: Colorless liquid. It has f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/35C07C209/72
CPCY02P20/10
Inventor 徐宜彬
Owner BINZHOU YUNENG CHEM
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