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Method for preparing refined hydrogen through deamination in tail gas generated by preparation of cyclohexylamine and dicyclohexylamine through aniline hydrogenation

A technology of dicyclohexylamine and cyclohexylamine, applied in the chemical industry, can solve the problems of increasing production costs, polluting the environment, wasting materials, etc., and achieve the effect of reducing material consumption and energy consumption

Inactive Publication Date: 2015-03-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of catalytic hydrogenation of aniline to synthesize cyclohexylamine and dicyclohexylamine, ammonia gas is also one of the products of the hydrogenation process, and excess raw material hydrogen is used as tail gas. Manufacturers generally directly discharge the atmosphere, pollute the environment, and cause a lot of waste of materials. increase production costs

Method used

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  • Method for preparing refined hydrogen through deamination in tail gas generated by preparation of cyclohexylamine and dicyclohexylamine through aniline hydrogenation
  • Method for preparing refined hydrogen through deamination in tail gas generated by preparation of cyclohexylamine and dicyclohexylamine through aniline hydrogenation
  • Method for preparing refined hydrogen through deamination in tail gas generated by preparation of cyclohexylamine and dicyclohexylamine through aniline hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] As attached to the manual figure 1 As shown, the ammonia-containing hydrogen tail stream of the aniline hydrogenation to cyclohexylamine and aniline hydrogenation to dicyclohexylamine units ③375.04kg / h, enters the absorption tower from the bottom of the ammonia absorption tower, and the operating pressure of the ammonia absorption tower is 0.05Mpa , the operating temperature is 15°C, the mass flow rate of water is 977.65kg / hr, and the mass ratio of water to gas is 2.61. The stream after deamination ⑤ enters the water adsorption tower a through the water separator and fiber filter. The adsorbent of the water adsorption tower is 5A molecular sieve, the operating pressure is 0.04Mpa, and the operating temperature is 12°C. Under this operating condition, aniline is hydrogenated Table 1 shows the parameters of each stream in the process of producing cyclohexylamine and dicyclohexylamine tail gas by removing ammonia and refining hydrogen. The refined hydrogen molar content i...

Embodiment 2

[0022] As attached to the manual figure 1 As shown, the ammonia-containing hydrogen tail stream of the aniline hydrogenation to cyclohexylamine and aniline hydrogenation to dicyclohexylamine units ③375.04kg / h, enters the absorption tower from the bottom of the ammonia absorption tower, and the operating pressure of the ammonia absorption tower is 0.03Mpa , the operating temperature is 25°C, the mass flow rate of water is 1098.87kg / hr, and the mass ratio of water to gas is 2.93. The stream after deamination ⑤ enters the water adsorption tower a through the water separator and fiber filter. The adsorbent of the water adsorption tower is silica gel, the operating pressure is 0.03Mpa, and the operating temperature is 25°C. Under this operating condition, aniline is hydrogenated to prepare Table 2 shows the parameters of each stream in the hydrogen purification process by deamination of cyclohexylamine and dicyclohexylamine tail gas. The refined hydrogen molar content is 98.69%, a...

Embodiment 3

[0026] As attached to the manual figure 1 As shown, the ammonia-containing hydrogen tail stream of the aniline hydrogenation to cyclohexylamine and aniline hydrogenation to dicyclohexylamine units ③375.04kg / h, enters the absorption tower from the bottom of the ammonia absorption tower, and the operating pressure of the ammonia absorption tower is 0.05Mpa , the operating temperature is 20°C, the mass flow rate of water is 977.65kg / hr, and the mass ratio of water to gas is 2.61. The stream after deamination ⑤ enters the water adsorption tower a through the water separator and fiber filter. The adsorbent of the water adsorption tower is 5A molecular sieve, the operating pressure is 0.04Mpa, and the operating temperature is 20°C. Under this operating condition, aniline is hydrogenated The parameters of each stream in the process of deamination and refining hydrogen from the tail gas of cyclohexylamine and dicyclohexylamine are shown in Table 3. Due to the high solubility of ammon...

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Abstract

The invention relates to a tail gas refining method, and in particular relates to a method for preparing refined hydrogen through deamination in tail gas generated by preparation of cyclohexylamine and dicyclohexylamine through aniline hydrogenation, belonging to the technical field of chemical engineering. The method comprises the following steps: allowing tail gas discharged by a cyclohexylamine device and a dicyclohexylamine device to enter an ammonia absorption tower by virtue of a Roche hydrogen compressor and a degreaser, wherein most of ammonia is absorbed by water to be converted into ammonia water to be output from the tower bottom in the tower, and the gas output from the tower top is water-containing hydrogen; allowing the water-containing hydrogen to pass through a water segregator, a fiber filter and a water adsorption tower so as to further remove water vapor, thereby obtaining the refined hydrogen. The concentration of the refined hydrogen can be 98.0-99.8 percent, the material and energy consumption is reduced, and the aims of energy conservation and emission reduction are achieved. The refined hydrogen can serve as recycling gas to be used for an aniline hydrogenation reaction, and gas phase zero emission is realized.

Description

technical field [0001] The invention relates to a tail gas refining method, in particular to a method for preparing cyclohexylamine and dicyclohexylamine tail gas deamination and refining hydrogen through hydrogenation of aniline, belonging to the technical field of chemical industry. Background technique [0002] Dicyclohexylamine is an inevitable by-product of cyclohexylamine production at home and abroad. In my country, cyclohexylamine is generally synthesized by catalytic hydrogenation of aniline, and dicyclohexylamine is co-produced at the same time. According to different reaction conditions and catalysts, different proportions of cyclohexylamine and dicyclohexylamine can be obtained. If deliberately adjusted, dicyclohexylamine can be produced rate can be doubled. Dicyclohexylamine is an important fine chemical intermediate. With the progress of science and technology, its new applications are constantly being developed. Most of the fine chemicals synthesized from dicy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50C01C1/12
Inventor 梅华任国卿刘辉
Owner NANJING UNIV OF TECH
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