Method for preparing chlorinated polyvinyl chloride by low-temperature plasma circulating fluidize bed and device

A technology of chlorinated polyvinyl chloride and low-temperature plasma, which is applied in the field of plasma circulating fluidized bed preparation of chlorinated polyvinyl chloride, can solve serious pollution problems, achieve uniform particle flow, easy control of process parameters, and reduce pollution

Active Publication Date: 2011-05-11
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is: to overcome the shortcomings of serious pollution in the traditional process, use plasma to initiate the chlorination reaction of polyvinyl chloride, realize it in the gas-solid phase circulating fluidized bed, and realize the chlorination of polyvinyl chloride under the action of low temperature plasma Ethylene synthesis

Method used

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  • Method for preparing chlorinated polyvinyl chloride by low-temperature plasma circulating fluidize bed and device
  • Method for preparing chlorinated polyvinyl chloride by low-temperature plasma circulating fluidize bed and device
  • Method for preparing chlorinated polyvinyl chloride by low-temperature plasma circulating fluidize bed and device

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Embodiment 1

[0059] like figure 1 In the reaction device shown, polyvinyl chloride raw material particles with a particle size distribution of 15 μm to 200 μm are used, pure chlorine gas is fed, the operating pressure of the down-bed reactor is 1 atm, and the dielectric barrier discharge is adopted to realize polymerization in the down-bed. The surface chlorination of vinyl chloride particles increases the chlorine content of polyvinyl chloride from 57% to 61%. The particles continue to enter the riser reactor, go up under the drive of inert gas, enter the gas-solid separator, and the solid particles enter the The temperature is distributed in the turbulent bed at 80°C-90°C to realize the migration and homogenization of surface chlorine to the inside, and continue to enter the descending bed to circulate and carry out the chlorine addition migration reaction, and the hydrogen chloride gas in the mixed gas after passing through the gas-solid separator It is separated by the gas separator, a...

Embodiment 2

[0061] like figure 2 In the reaction device shown, polyvinyl chloride raw material particles with a particle size distribution of 150 μm to 250 μm are used, pure chlorine gas is fed, the operating pressure of the down-bed reactor is 1 atm, and the dielectric barrier discharge is adopted to realize polymerization in the down-bed. The surface chlorination of vinyl chloride particles increases the chlorine content of polyvinyl chloride from 57% to 60%. After the particles pass through the gas-solid separator, they enter the turbulent bed with a temperature distribution of 90°C-100°C to achieve the chlorine on the surface. The internal migration and homogenization continue to enter the riser reactor under the action of supplementary air. There is still a dielectric barrier discharge device in the riser reactor, and the surface chlorination reaction of polyvinyl chloride continues, and the chlorine content increases to 61.5%. After entering the gas-solid separator, the separated s...

Embodiment 3

[0063] like image 3 In the reaction device shown, polyvinyl chloride raw material particles with a particle size distribution of 80 μm to 120 μm are used, inert carrier gas and chlorine gas are fed at a ratio of 2:1, the operating pressure of the down-bed reactor is 1 atm, and a dielectric barrier is used. In the form of discharge, the surface chlorination of polyvinyl chloride particles is realized in the down-going bed, so that the chlorine content of polyvinyl chloride increases from 57% to 59%, and the particles continue to enter the riser reactor and go up under the drive of inert gas. There is still a dielectric barrier discharge device in the riser reactor, and the surface chlorination reaction of polyvinyl chloride continues, and the chlorine content is increased to 60%, and then the particles enter the turbulent bed with a temperature distribution of 80°C-105°C to realize surface chlorine chlorination. Internal migration and homogenization, continue to separate the p...

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Abstract

The invention relates to a method for preparing chlorinated polyvinyl chloride by a low-temperature plasma circulating fluidize bed and a device, which are used for synthesis of macromoleclar polymer chlorinated polyvinyl chloride (chlorinated polyvinyl chloride). The process utilizes the characteristic that low-temperature plasma can activate chlorine and the surface of polrvinyl chloride (PVC) at the same time, so as to realize the process of polrvinyl chloride chlorination by high-efficiency excitation in a downer reactor and further realize a process that chlorine on the surface moves to the inner part in a raising pipe and a turbulent bed; therefore, the whole chlorination process is decoupled into rapid and slow steps, and the production efficiency is obviously superior to the process of ultraviolet chlorination and chlorination with a aqueous phase suspension method. The chlorine which separates hydrogen chloride can be utilized in a circulating way, and the whole process has no pollutant discharge and raw material waste, therefore, the process is a clean process.

Description

technical field [0001] The invention relates to a method and device for preparing chlorinated polyvinyl chloride in a low-temperature plasma circulating fluidized bed, which belongs to a synthesis process of polymer materials. Background technique [0002] Chlorinated polyvinyl chloride (chlorinated polyvinyl chloride) is a new type of high-performance plastic. It uses polyvinyl chloride (PVC) particles as raw materials, and further chlorinates them by means of reactive chlorine addition, so that the chlorine content increases from 56.8% of polyvinyl chloride to 60%-70%. The theoretical chlorine content of chlorinated polyvinyl chloride can reach up to 73.2%, and the chlorine content of general chlorinated polyvinyl chloride is 61%-68%. Due to the increase in the content of polar elements, chlorinated polyvinyl chloride exhibits a series of characteristics that are much superior to polyvinyl chloride. The Vicat softening temperature of chlorinated polyvinyl chloride reache...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/06C08F8/22
Inventor 程易王琦卢巍金涌
Owner TSINGHUA UNIV
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