Multilayer bed reactor and method for synthesizing chlorinated polyvinyl chloride by using low temperature plasmas

A low-temperature plasma, chlorinated polyvinyl chloride technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problems of large circulation, difficult bed temperature control, inability to continuously operate, etc., to achieve continuous Production, improved initiation efficiency, high energy density effects

Active Publication Date: 2013-03-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still has problems such as inability to operate continuously, low single-pass conversion rate of chlorine gas, large circulation volume, and difficult temperature control inside the bed, which needs further improvement and improvement.

Method used

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  • Multilayer bed reactor and method for synthesizing chlorinated polyvinyl chloride by using low temperature plasmas
  • Multilayer bed reactor and method for synthesizing chlorinated polyvinyl chloride by using low temperature plasmas

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The fluidized bed reactor has 20 layers, and the layer height is 0.2m. Each layer was operated at atmospheric pressure. The PVC granules with an average particle size of 150 μm are continuously loaded into the fluidized bed reactor at the top of the fluidized bed reactor. In the main body of the fluidized bed reactor, the temperature of the first layer is 60°C, the residence time is 5min, the temperature of the second layer is 100°C, and the temperature between each layer is increased by 2°C, and the temperature of the 20th layer of the fluidized bed reactor is 140°C . On the 2nd to 20th floors, the particle residence time is 5 minutes. The reaction gas is a mixture of chlorine and argon, and the percentage of chlorine is 30%. The particles descend in the inner overflow pipe, pass through the low-temperature plasma area, activate chlorine gas and PVC particles, and undergo chlorination reaction, and the residence time is 2 minutes. The low temperature plasma power d...

Embodiment 2

[0042] The fluidized bed reactor has 15 layers, the layer height is 0.25m, and the operating pressure is 1.5atm. The PVC particles with an average particle size of 150 μm are continuously loaded into the fluidized bed reactor at the upper part of the fluidized bed reactor. In the main body of the fluidized bed reactor, the temperature of the first layer is 60°C, the residence time is 5 minutes, the temperature of the second layer is 80°C, and the temperature between each layer is increased by 3°C, and the temperature of the 15th layer of the fluidized bed reactor is 120°C . On the 2nd to 15th floors, the particle residence time is 10min. The reaction gas is a mixture of chlorine and argon, and the percentage of chlorine is 30%. The particles descend in the inner overflow pipe, pass through the low-temperature plasma area, activate chlorine gas and PVC particles, and undergo chlorination reaction, and the residence time is 1min. The low temperature plasma power density in th...

Embodiment 3

[0045] The fluidized bed reactor has 5 layers, the layer height is 0.8m, and it operates under normal pressure. The PVC particles with an average particle size of 100 μm are continuously loaded into the fluidized bed reactor at the upper part of the fluidized bed reactor. In the main body of the fluidized bed reactor, the temperature of the first layer is 80°C, the residence time is 5 minutes, the temperature of the fifth layer is 125°C, and the temperature of the middle layers is increased by 15°C. On the 2nd to 5th floors, the particle residence time is 60min. The reaction gas is a mixture of chlorine and argon, and the percentage of chlorine is 30%. The particles descend in the outer overflow pipe, pass through the low-temperature plasma area, activate chlorine gas and PVC particles, and undergo chlorination reaction, and the residence time is 1min. The fluidization gas of the outer overflow tube is pure argon, and the power density of the low-temperature plasma is 10W / cm...

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Abstract

A multilayer bed reactor and a method for synthesizing chlorinated polyvinyl chloride by using low temperature plasmas belongs to a process and equipment for synthesizing a high polymer material. The characteristic that the low temperature plasmas can simultaneously activate poly vinyl chloride (PVC) particles and chlorine is utilized, the multilayer bed reactor is adopted, a low temperature plasma generating device is arranged in an overflow pipe, the chlorination of the PVC particles is initiated, and the PVC particles are fluidized on various layers of gas distribution plates of a fluidized bed reactor and are contacted with a feed gas in a countercurrent mode for reaction. The fluidized bed has temperature gradient, and is operated at different chlorination temperatures from top to bottom. After the particles are subjected to multi-stage reaction, a chlorinated polyvinyl chloride particle product is directly taken out of the bottom of the fluidized bed reactor. The invention can realize the continuous production of the chlorinated polyvinyl chloride, the utilization efficiency of the chlorine is high in the process, and the invention has the advantages of cleanness, high efficiency, and uniform product quality.

Description

technical field [0001] The invention relates to a method and a reactor for synthesizing chlorinated polyvinyl chloride, in particular to a multilayer fluidized bed reactor and a method for synthesizing chlorinated polyvinyl chloride, belonging to the synthesis of a polymer material in the chlor-alkali industry Process and equipment. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) is a new high-performance plastic. It is made of polyvinyl chloride (PVC) by means of reactive chlorination. The chlorine content increases from 56.8% of PVC to 60%-70%, theoretically up to 73.2%. Generally, CPVC has a chlorine content of 61. %-68%. Due to the increase in the content of polar elements, CPVC exhibits a series of characteristics that are much superior to PVC: the Vicat softening temperature reaches 90-125°C, after treatment, the maximum use temperature is 110°C, and the long-term use temperature is 95°C, which has better Weather resistance, corrosion resistance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/06C08F8/22B01J8/28
Inventor 程易卢巍曹腾飞
Owner TSINGHUA UNIV
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