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Reaction system and reaction method for preparing divinyl benzene by dehydrogenation of diethylbenzene

A technology for producing divinylbenzene by dehydrogenation of diethylbenzene and a reaction system, which is applied to chemical instruments and methods, hydrocarbons, hydrocarbons, etc. Reaction pressure drop and other problems, to achieve the effect of improving energy utilization efficiency, low bed resistance, and less impurities

Pending Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the low concentration of divinylbenzene in the dehydrogenation reaction of diethylbenzene in the prior art, the difficulty in loading the catalyst in the reactor, the complicated reaction process, and the large pressure drop of the reaction

Method used

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  • Reaction system and reaction method for preparing divinyl benzene by dehydrogenation of diethylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 Shown, a kind of diethylbenzene dehydrogenation reaction system (8000 hours of operating hours) of divinylbenzene.

[0045] include:

[0046] The first dehydrogenation reactor, the second dehydrogenation reactor, the heating furnace, the second dehydrogenation reactor feed heat exchanger and the second dehydrogenation reactor discharge heat exchanger;

[0047] A raw material mixer is arranged at the bottom of the first dehydrogenation reactor; the raw material mixer is connected with the first dehydrogenation reactor;

[0048] The diethylbenzene feed line is connected to the discharge heat exchanger of the second dehydrogenation reactor and then connected to the raw material mixer; the steam feed line is connected to the heating furnace, and there are two outlet pipelines of the heating furnace, one connected to the raw material mixer and the other Return to the heating furnace after the branch is connected to the feed heat exchanger of the second deh...

Embodiment 2

[0061] A certain 10,000 tons / year divinylbenzene plant (8000 hours of annual operating hours), the same as Example 1, the only difference is that the distance between the outlet line of the first dehydrogenation reactor and the bottom of the dehydrogenation reactor accounts for the total amount of the dehydrogenation reactor. 15% of the height; the distance between the outlet line of the second dehydrogenation reactor and the bottom of the dehydrogenation reactor accounts for 15% of the total height of the dehydrogenation reactor;

[0062] Reaction method is with embodiment 1, difference is:

[0063] The mass ratio of water to diethylbenzene is 1.56, the pressure of the first dehydrogenation reactor is 59Kpa, and the feed temperature of the first dehydrogenation reactor after mixing is 630°C;

[0064] The pressure of the second dehydrogenation reactor is 50Kpa, and the feed temperature after mixing in the second dehydrogenation reactor is 635° C., and the content of divinylben...

Embodiment 3

[0067] A certain 10,000 tons / year divinylbenzene plant (8000 hours of annual operating hours), the same as in Example 1; the difference is only that the distance between the outlet line of the first dehydrogenation reactor and the bottom of the dehydrogenation reactor accounts for the total amount of the dehydrogenation reactor. 25% of the height; the distance between the outlet line of the second dehydrogenation reactor and the bottom of the dehydrogenation reactor accounts for 25% of the total height of the dehydrogenation reactor;

[0068] Method is with embodiment 1;

[0069] The difference is that:

[0070] The mass ratio of water to diethylbenzene is 1.34, the pressure of the first dehydrogenation reactor is 60Kpa, and the feed temperature of the first dehydrogenation reactor after mixing is 620°C;

[0071] The pressure of the second dehydrogenation reactor is 52Kpa, and the feed temperature after mixing in the second dehydrogenation reactor is 625° C., and the content ...

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Abstract

The invention discloses a reaction system and a reaction method for preparing divinyl benzene by dehydrogenation of diethylbenzene. The system comprises a first dehydrogenation reactor, a second dehydrogenation reactor, a heating furnace, a second dehydrogenation reactor feeding heat exchanger and a second dehydrogenation reactor discharging heat exchanger. A diethylbenzene feeding pipeline is connected with the second dehydrogenation reactor discharging heat exchanger and then connected with the bottom of the first dehydrogenation reactor. A steam feeding pipeline is connected with the heating furnace which has two outlet pipelines, with one connected with the bottom of the first dehydrogenation reactor, and the other connected with the second dehydrogenation reactor feeding heat exchanger and then returning to the heating furnace. A side outlet pipeline of the first dehydrogenation reactor is connected with the second dehydrogenation reactor feeding heat exchanger and then connected with the bottom of the second dehydrogenation reactor. A side outlet pipeline of the second dehydrogenation reactor is connected with the second dehydrogenation reactor discharging heat exchanger and then is guided to the outside. The system and the method provided by the invention have the characteristics of simple operation, reasonable process arrangement and high content of divinyl target component, and can be specifically and industrially applied.

Description

technical field [0001] The invention relates to the technical field of divinylbenzene production, and furthermore, relates to a reaction system and a reaction method for preparing divinylbenzene by dehydrogenating diethylbenzene. Background technique [0002] Divinylbenzene is a very useful crosslinking agent, mainly used in the manufacture of plastics and ion exchange resins. Divinylbenzene is highly reactive and can form insoluble polymers with three-dimensional structures. It can be used as a crosslinking agent and can be copolymerized with polymerizable monomers such as styrene, butadiene, acrylonitrile, and methacrylic acid to prepare ion exchange resins. Wait. Generally, the cross-linking speed of p-divinylbenzene is faster, and the higher the para-body content, the better the performance of the obtained resin. Globally, the consumption proportion of divinylbenzene in various application fields is 66.8% for ion exchange resins, 13.9% for special plastics, 7.3% for ru...

Claims

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Application Information

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IPC IPC(8): C07C5/333C07C15/44
CPCC07C5/333C07C15/44
Inventor 张彬刘文杰
Owner CHINA PETROLEUM & CHEM CORP
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