Hexamethylenediamine production system

A production system, the technology of hexamethylenediamine, applied in the chemical industry, can solve the problems of difficult to meet the production of high-quality hexamethylenediamine, unfavorable reaction temperature, difficult heat discharge, etc., and achieve the effect of uniform heat production, uniform reaction and small flow

Pending Publication Date: 2021-02-09
CHONGQING HUAFON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the currently used reactors, the catalyst installed in the reactor has a floating problem due to mechanical loss and damage, and the heat generated by the reaction is not

Method used

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  • Hexamethylenediamine production system

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Experimental program
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Effect test

Embodiment 1

[0027] see figure 1 , the production system of hexamethylenediamine includes hydrogenation reactor 1, gas-liquid separator 2, the number of hydrogenation reactor 1, gas-liquid separator 2 is the same, and the number of gas-liquid separator 2, hydrogenation reactor 1 is at least In this embodiment, the number of hydrogenation reactors and gas-liquid separators is three, and the hydrogenation reactor at the high position is the first hydrogenation reactor, which is at the left side, and the hydrogenation reaction at the low position The third hydrogenation reactor is located on the right, and the middle hydrogenation reactor is the second hydrogenation reactor, located between the first hydrogenation reactor and the third hydrogenation reactor. The hydrogenation reactor 1 is a gas-liquid-solid three-phase fixed-bed reactor. Specifically, the shell of each hydrogenation reactor is composed of an upper cylindrical section 1a and a lower inverted conical section 1b to form a whole....

Embodiment 2

[0029] The average particle size of the Raney nickel catalyst filled in each hydrogenation reactor was 40 μm. The prepared ethanol solution and sodium hydroxide mixture flowed through three hydrogenation reactors in series in sequence, and the temperature of each hydrogenation reactor was controlled at 73, 75 and 77° C. respectively. Add adiponitrile from the top to the first hydrogenation reactor, the second hydrogenation reactor, and the third hydrogenation reactor, and the total amount of addition is controlled at about 4.5m 3 / h. After the mixed liquid enters the first hydrogenation reactor, it overflows to the second hydrogenation reactor and the third hydrogenation reactor sequentially by utilizing the liquid level difference. The reaction of adiponitrile and hydrogen is an exothermic reaction, and heat exchange is performed in a closed cycle using heat exchange interlayers, heat exchange coils, medium circulation pumps, and heat exchangers. The circulating hydrogen of ...

Embodiment 3

[0032] The average particle size of the Raney nickel catalyst filled in each hydrogenation reactor was 60 μm. The prepared ethanol solution and sodium hydroxide mixture flowed through three series hydrogenation reactors in sequence, and the temperature of each hydrogenation reactor was controlled at 74, 76 and 78° C. respectively. Add adiponitrile from the top to the first hydrogenation reactor, the second hydrogenation reactor, and the third hydrogenation reactor, and the total amount of addition is controlled at about 6m 3 / h. After the mixed liquid enters the first hydrogenation reactor, it overflows to the second hydrogenation reactor and the third hydrogenation reactor sequentially by utilizing the liquid level difference. The reaction of adiponitrile and hydrogen is an exothermic reaction, and heat exchange is performed in a closed cycle using heat exchange interlayers, heat exchange coils, medium circulation pumps, and heat exchangers. The circulating hydrogen of each...

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Abstract

A hexamethylenediamine production system comprises at least two hydrogenation reactors, a gas-liquid separator and a gas-liquid separator, wherein the hydrogenation reactors are gas-liquid-solid three-phase fixed bed reactors, a heat exchange interlayer is arranged on the side wall of each hydrogenation reactor, and a heat exchange coil is arranged in each hydrogenation reactor; wherein the top ofeach hydrogenation reactor is connected with an adiponitrile source through a first feeding pipe, a first valve is arranged on each first feeding pipe, the bottom of each hydrogenation reactor is connected with a hydrogen source through a second feeding pipe, and a second valve is arranged on each second feeding pipe; the side wall of the hydrogenation reactor located at the high position is connected with a liquid-phase material source through a third feeding pipe and connected with the side wall of the hydrogenation reactor located at the low position through an overflow pipe, and the gas-liquid separator is arranged at the top of the corresponding hydrogenation reactor. The hexamethylenediamine production system is simple in structure and convenient to operate, can effectively reduce the mechanical loss of the catalyst, is convenient for enterprises to control the reaction temperature, and is beneficial to production of high-quality hexamethylenediamine products.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a production system of hexamethylenediamine. Background technique [0002] Chemical companies often use adiponitrile and hydrogen as raw materials to synthesize hexamethylenediamine in a solidified bed reactor. [0003] The existing production method of hexamethylenediamine is mainly hydrogenation of adiponitrile in the presence of a skeletal nickel catalyst to react. The reaction is divided into high-pressure method and low-pressure method: [0004] The high-pressure method uses cobalt-copper catalyst, the reaction temperature is 100-135°C, the pressure is 60MPa, and it is carried out in a three-phase fluidized bed reactor. The solvent is liquid ammonia. The equation is as follows: [0005] NC(CH 2 ) 4 CN+4H 2 → Co-Cu H 2 N(CH 2 ) 6 NH 2 [0006] The selectivity of hexamethylenediamine is about 90% to 95%. [0007] The low-pressure method uses adiponitrile and hydrogen...

Claims

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Application Information

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IPC IPC(8): B01J8/02C07C209/48C07C209/84C07C211/12
CPCB01J8/02B01J8/0278C07C209/48C07C209/84C07C211/12
Inventor 陈恩之赵风轩陈东生张银杏全涛李宁张楠高泉
Owner CHONGQING HUAFON CHEM
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