Adiponitrile hydrogenation reaction system and method for treating severe clogging of reactor by the system

A hydrogenation reaction and reactor technology, which is applied to the adiponitrile hydrogenation reaction system and the field of heavy blockage of the system to deal with the reactor, and can solve the problems of return pipe blockage and the like

Active Publication Date: 2020-09-22
HENAN SHENMA NYLON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of severe blockage of the return pipe in the reactor during the hydrogenation reaction of adiponitrile, the present invention discloses a hydrogenation reaction system for adiponitrile. Compared with the prior art, the reaction system adds additional pipelines A and The additional pipeline B makes it possible to use this system to solve the problem of severe blockage of the return pipe without stopping the reaction;
[0004] In order to solve the problem of severe blockage of the return pipe in the reactor during the hydrogenation reaction of adiponitrile, the present invention discloses a method for dealing with severe blockage of the reactor, which uses the hydrogenation reaction of adiponitrile in the present invention Relying on the system, it can effectively solve the problem of severe blockage of the return pipe, and the operation is simple and the effect is good

Method used

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  • Adiponitrile hydrogenation reaction system and method for treating severe clogging of reactor by the system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Utilize the method for adiponitrile hydrogenation reaction system to deal with severe clogging of reactor, comprising the following steps:

[0034] 1) First close the hand valve A301 and the sampling valve 501, and open the sampling root valve 502 to connect the connecting pipeline between the reactor feed pump equipment 3, the reactor sampling tank 5 and the return pipe 402;

[0035] 2) Turn on the ethanol feed pump 8 and the reactor feed pump 3, and control the reactor feed pump 3 with a load of 30% and an outlet pressure of 2.7MPa to pass ethanol as a diluent through the reactor sampling tank 5 into the return pipe 402 and the decanter 401;

[0036] 3) Open the hand valve B403, use ethanol as a diluent to wash between the return pipe 402 and the reactor 4 for 5 minutes, then close the hand valve B403, and continuously send ethanol into the return pipe 402 and decanter 401 to pass through the continuous flow The ethanol that enters builds up pressure in return pipe 4...

Embodiment 2

[0042] Utilize the method for adiponitrile hydrogenation reaction system to deal with severe clogging of reactor, comprising the following steps:

[0043] 1) First close the hand valve A301 and the sampling valve 501, and open the sampling root valve 502 to connect the connecting pipeline between the reactor feed pump equipment 3, the reactor sampling tank 5 and the return pipe 402;

[0044] 2) Turn on the ethanol feed pump 8 and the reactor feed pump 3, and control the reactor feed pump 3 with a load of 60% and an outlet pressure of 4.2MPa to pass ethanol as a diluent through the reactor sampling tank 5 into the return pipe 402 and the decanter 401;

[0045] 3) Open the hand valve B403, use ethanol as a diluent to wash between the return pipe 402 and the reactor 4 for 10 minutes, then close the hand valve B403, and continuously send ethanol into the return pipe 402 and decanter 401 to pass through the continuous flow The ethanol that enters builds up pressure in return pipe ...

Embodiment 3

[0051] Utilize the method for adiponitrile hydrogenation reaction system to deal with severe clogging of reactor, comprising the following steps:

[0052] 1) First close the hand valve A301 and the sampling valve 501, and open the sampling root valve 502 to connect the connecting pipeline between the reactor feed pump equipment 3, the reactor sampling tank 5 and the return pipe 402;

[0053] 2) Turn on the ethanol feed pump 8 and the reactor feed pump set 3, and control the reactor feed pump set 3 with a load of 45% and an outlet pressure of 3.5 MPa to pass ethanol as a diluent through the reactor sampling tank 5 into the return pipe 402 and the decanter 401;

[0054] 3) Open the hand valve B403, use ethanol as a diluent to wash between the return pipe 402 and the reactor 4 for 8 minutes, then close the hand valve B403, and continuously send ethanol into the return pipe 402 and decanter 401 to pass through the continuous flow The ethanol that enters builds up pressure in retu...

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Abstract

The invention discloses an adiponitrile hydrogenation reaction system and a method for dealing with severe blockage of a reactor by the system. The system is formed by adding an additional pipeline Aand an additional pipe B based on an existing production system in order to realize communication of pipelines among a reactor feed pump preparation station, a reactor sampling tank and a returning pipe when dealing with blockage of the returning pipe by opening or closing a hand valve. The method comprises the following steps: using ethanol continuously fed into the returning pipe as a pressure source; forming a pressure in the blocked returning pipe; after continuing to feed the ethanol for a certain period of time, rapidly opening a hand valve B, so that the pressure in the returning pipe pours down in an instant and runs at blockages; repeating the process for several times to carry away small particles of catalyst severely blocked in the returning pipe so as to dredge the returning pipe. The system and the method provided by the invention solve a problem of severe blockage of the returning pipe of the reactor without stopping during adiponitrile hydrogenation reaction production,keep continuous production, reduce costs indirectly and improve production efficiency.

Description

technical field [0001] The invention relates to the technical field of adiponitrile hydrogenation reaction to produce hexamethylenediamine, in particular to an adiponitrile hydrogenation reaction system and a method for treating severe clogging of a reactor in the system. Background technique [0002] Now the return pipe of the adiponitrile hydrogenation reactor is often blocked due to poor catalyst flow, which brings great pressure to the daily operation of the adiponitrile hydrogenation reaction. The main reason for reactor blockage is that the particle size of the catalyst becomes smaller, the viscosity is higher, the fluidity becomes worse, and the catalyst hangs on the wall and accumulates in the decanter. Once the reactor is clogged, if it is not handled in time, it will seriously affect the daily operation of the hydrogenation reaction of adiponitrile, and accidents such as the flooding of the hydrogen scrubber. The characteristics of the adiponitrile hydrogenation r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/00C07C211/12C07C209/48
CPCY02P20/584
Inventor 赵铎陈聚良郭卫东高先明姚彦杰黄敏王海营刘耀文霍美菊单海波杨天记徐振伟欧玲张敏韩新启付乐乐
Owner HENAN SHENMA NYLON CHEM
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