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Acetylene method vinyl chloride synthesis reaction process

An acetylene-based vinyl chloride synthesis reaction technology, which is applied in the field of warm reaction technology, can solve the problems of large number of reactors, complex reaction process, and increased reaction cost, so as to increase the effective heat exchange area and heat transfer capacity, and improve the reaction efficiency. Efficiency, the effect of saving equipment investment

Pending Publication Date: 2020-12-22
鄂尔多斯市瀚博科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the concentration of acetylene gas fed into the converter increases, vinyl chloride synthesis is used to promote the conversion rate of acetylene and prolong the service life of the catalyst, but preheating is required during the reaction process, the number of reactors used is large, and the reaction process is complicated, which increases the response cost
[0011] Based on the problems existing in the above prior art, a kind of acetylene process vinyl chloride synthesis reaction process that can meet the synthesis reaction temperature of vinyl chloride, avoid catalyst deactivation as far as possible, reduce the number of equipment, and effectively utilize system energy is designed. Necessary, but many challenges remain

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  • Acetylene method vinyl chloride synthesis reaction process
  • Acetylene method vinyl chloride synthesis reaction process
  • Acetylene method vinyl chloride synthesis reaction process

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specific Embodiment approach

[0047] The raw material gas of the present invention enters the adiabatic reaction section of the catalyst from the central gas distribution pipe at the upper part of the reactor, enters the catalyst bed through the gas distributor, conducts the adiabatic catalytic reaction along the radial direction, and then enters the isothermal catalytic reaction section through the gas channel, and then passes through the shell. The openings of the catalyst bed enter the catalyst bed, carry out isothermal catalytic reaction along the radial direction, and finally enter the central gas collecting pipe to exit the reactor. The circulating medium enters the water chamber at the bottom of the reactor from the gas-liquid separator, enters the catalyst bed along the heat exchange tube, enters the gas chamber after absorbing heat and vaporizes, and returns to the gas-liquid separator.

[0048] Below in conjunction with the examples, the specific implementation of the present invention will be fur...

Embodiment 1

[0050] as attached figure 1 As shown, a vinyl chloride synthesis system using a radial adiabatic isothermal reactor connected in parallel, including a radial adiabatic isothermal reactor and a gas-liquid separator. Reactor E4 is an acetylene-process vinyl chloride synthesis reactor, which includes an upper head 1, a shell 2 and a lower head 3 from top to bottom, and is characterized in that the shell 2 includes an upper section, a Air chamber 12, lower section and water chamber 13.

[0051] The upper section includes a central air distribution pipe 4, a catalyst pressure plate 6, an adiabatic catalytic reaction section 5 and a support plate 7, the central air distribution pipe 4 is arranged in the middle of the upper section, the upper end is arranged outside the upper head 1, and the lower end is connected to the support plate 7, Between the catalyst pressure plate 6 and the support plate 7 is an adiabatic catalytic reaction section 5 . The lower section includes a heat exc...

Embodiment 2

[0055] After the raw material gas hydrogen chloride and acetylene are mixed in the mixer E1 with a molar ratio of 1.1:1, the mixed raw gas is cooled to -14°C through the mixed gas cooler E2, and then the mixed gas is removed through the demister E3. Hydrochloric acid mist, then enters the reactor from the top of the radial reactor E4, and enters the adiabatic catalytic reaction section through the central gas distribution pipe. The gas channel and the gas distributor enter the isothermal catalytic reaction section, and then enter the catalyst bed through the openings on the shell, and carry out the isothermal catalytic reaction along the radial direction. The space velocity of the raw material gas acetylene entering the central gas distribution pipe is controlled at 50h -1 , The feed gas pressure is 40kPag. The mixed feed gas undergoes catalytic reaction along the radial direction, and finally enters the central gas collecting pipe and exits the reactor from the bottom of the...

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Abstract

The invention relates to a vinyl chloride synthesis reaction process, in particular to an acetylene method vinyl chloride synthesis reaction process which comprises the following steps: (1) carrying out adiabatic catalytic reaction on mixed raw material gas A to obtain mixed gas B; and (2) carrying out isothermal catalytic reaction on the mixed gas B to obtain mixed gas C containing vinyl chloride, and enabling the mixed gas C to enter a post-treatment system. Radial and two-stage catalytic reactions are adopted, an independent raw material gas preheater is omitted, the number of devices is reduced, the device investment is saved, the reaction pressure drop is reduced, the service life of the catalyst is prolonged, meanwhile, the subsequent reaction efficiency is improved, the conversion rate is larger than 98.5%, and the selectivity is larger than 99%.

Description

technical field [0001] The invention relates to a synthesis reaction process of vinyl chloride, in particular to a radial adiabatic isothermal reaction process for the synthesis of vinyl chloride by acetylene method. Background technique [0002] Vinyl chloride monomer is the raw material for polyvinyl chloride polymerization. During the production of polyvinyl chloride by the calcium carbide method, the acetylene gas sent by the acetylene unit is cooled to about 1-5°C by the flame arrester and the precooler, and sent to the hydrogen chloride unit. The incoming hydrogen chloride gas is mixed with a molecular ratio of 1:1.05-1.1. After being cooled and dehydrated, the mixed gas is heated to 70-90°C by a preheater, and then sent to the two-stage series-connected vinyl chloride synthesis conversion after meeting the activation temperature requirements. Converter, each stage converter can be operated by several in parallel. The content of acetylene in the outlet gas of the firs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/08C07C21/06
CPCC07C17/08C07C21/06
Inventor 颜艺专胡梦麟赵长森窦余信牛强
Owner 鄂尔多斯市瀚博科技有限公司
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