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Method for preparing vinyl chloride by circulating fluidized bed reactor and device thereof

A circulating fluidized bed and reactor technology, which is used in hydrogen halide addition preparation, organic chemistry, etc., can solve the problems of less vinyl chloride catalyst, poor operation flexibility, low production intensity, etc., and achieve the effect of gas-solid contact Enhances, reduces backmixing, and reduces mercury loss

Inactive Publication Date: 2008-02-13
XINJIANG TIANYE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a new high-efficiency gas distributor, a new The device and process method for preparing vinyl chloride by the reaction of hydrogen chloride and acetylene in a circulating fluidized bed reactor with internal components, multiple catalyst dense-phase zones, and part of the product air circulation, has the advantages of high production intensity, large operation flexibility, easy scale-up of production scale, High conversion rate of acetylene, high selectivity of vinyl chloride, less catalyst consumption and long service life etc.

Method used

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  • Method for preparing vinyl chloride by circulating fluidized bed reactor and device thereof
  • Method for preparing vinyl chloride by circulating fluidized bed reactor and device thereof
  • Method for preparing vinyl chloride by circulating fluidized bed reactor and device thereof

Examples

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Effect test

Embodiment 1

[0077] A circulating fluidized bed reactor with two catalyst dense phase zones was employed (Figure 1). Among them, the cyclone separator (one group) is built-in; the first gas distributor 3 adopts a tubular gas distributor whose pressure drop accounts for 20% of the total pressure drop of the catalyst in the first catalyst dense phase zone 5; 2 times, the total cross-sectional area is 5% of the cross-sectional area of ​​the circulating fluidized bed reactor cylinder; 20% of the cylinder diameter of the fluidized bed reactor; the distance between the internal components of the same layer is 10% of the cylinder diameter of the circulating fluidized bed reactor; the distance between the first gas distributor 3 and the second gas distributor 3a is 10 times the diameter of the cylinder of the circulating fluidized bed reactor; the distance from the upper end of the external overflow pipe 8 connecting the first and second catalyst dense-phase regions to the second gas distributor 3...

Embodiment 2

[0082] A circulating fluidized bed reactor with two catalyst dense phase zones was employed (Figure 2). Among them, the cyclone separator (two groups) is external; the first gas distributor 3 adopts a plate gas distributor whose pressure drop accounts for 35% of the total pressure drop of the catalyst in the first catalyst dense phase zone 5; 1 times, the heat exchange tube with a total cross-sectional area of ​​30% of the cross-sectional area of ​​the cylinder of the circulating fluidized bed reactor; the void ratio of the internal member is 50%; the intersection angle of two adjacent layers of internal members is 45°, and the distance is 20% of the cylinder diameter of the fluidized bed reactor; the distance between the internal components of the same layer is 1% of the cylinder diameter of the circulating fluidized bed reactor; the distance between the first gas distributor 3 and the second gas distributor 3a is 8 times of the cylinder diameter of the circulating fluidized ...

Embodiment 3

[0087] A circulating fluidized bed reactor with three catalyst dense phase zones was employed (Figure 3). Among them, the cyclone separator (two groups) is built-in; the first gas distributor 3 adopts a float valve type gas distributor whose pressure drop accounts for 30% of the total pressure drop of the catalyst in the first catalyst dense phase zone 5; the height used is the height of the catalyst dense phase 1.5 times of the heat exchange tube with a total cross-sectional area of ​​15% of the cross-sectional area of ​​the cylinder of the circulating fluidized bed reactor; the void ratio of the inner member is 70%, the intersection angle of two adjacent inner members is 90°, and the distance is cyclic 80% of the cylinder diameter of the fluidized bed reactor; the distance between internal components of the same layer is 10% of the cylinder diameter of the circulating fluidized bed reactor; the distance between the first gas distributor 3 and the second gas distributor 3a It...

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Abstract

The present invention discloses a method to prepare chloroethylene by a circulated flow bed reaction device and the corresponding device, which belongs to the chemical technical process and device technology region. Two or more than two gas distributing devices are arranged inside of the flow bed, which divide the flow bed into two or more than two catalyzer zones; a fan is arranged outside of the flow bed, which can make part of products circulate after being pressured and then enters the flow bed again; the design can make the catalyzer zones in a better flow state so as to guarantee the much better heat-exchange effect between the bed level and the heat-exchange interface; besides, the stability of the device and the elasticity of the operation can be enhanced; the low-temperature catalyzer zone in the upper level can decrease the temperature for the reaction gas, and then extract the included hydrargyrum so as to decrease the environment pollution because of the losing of hydrargyrum; the catalyzer in each catalyzer zone is circulated termly so as to use the catalyzing function for hydrargyrum enough. The flow bed reaction device and technology in the present invention has the advantages of high transfer ratio of ethyne, good diathermancy, even temperature of the bed level, good controlled ability and elastic operation and so on.

Description

technical field [0001] The invention relates to a fluidized bed reactor equipment and a process method for preparing vinyl chloride by reacting hydrogen chloride and acetylene, belonging to the technical field of chemical process and equipment. Background technique [0002] Vinyl chloride is a monomer for preparing polyvinyl chloride, and it is a very important chemical intermediate. [0003] At present, there are three methods for industrial production of vinyl chloride, that is, to prepare vinyl chloride by reacting acetylene, ethylene or ethane with hydrogen chloride respectively. The petroleum ethylene route has the advantages of advanced and mature technology, environmental protection, and easy scale-up. However, recently, with the rapid rise of international crude oil prices, the price of ethylene has risen, making its cost high. The source of the ethane route is mainly natural gas fields, which are strongly restricted by region. Acetylene, the raw material of the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/06C07C17/08
Inventor 罗国华张新力师海波周军魏飞李春华骞伟中安志明魏小波宋晓玲王垚王小昌李全胜
Owner XINJIANG TIANYE GRP
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