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Spouted bed reactor and method thereof for synthesizing chlorinated polyvinyl chloride by using low-temperature plasmas

A low-temperature plasma and chlorinated polyvinyl chloride technology, applied in the field of synthetic chlorinated polyvinyl chloride methods and reactors, to achieve short residence time, low pollution, and improved reaction efficiency

Active Publication Date: 2010-02-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xiong Xinyang published an article titled "Preparation of Chlorinated Polyvinyl Chloride by Low-temperature Plasma Gas Phase Method" in 2006. PVC chlorination was realized in a traditional fluidized bed, but the chlorination result could only reach 59.4%.

Method used

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  • Spouted bed reactor and method thereof for synthesizing chlorinated polyvinyl chloride by using low-temperature plasmas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The reactor was operated at atmospheric pressure. PVC particles with an average particle size of 250 μm are loaded into the reactor at the polyvinyl chloride raw material feed port 12, and the feed mass is 5 g. The input power of the low temperature plasma power supply is 50W. The reaction temperature was 100°C. Argon is used as the loosening gas, which is introduced from the loosening gas inlet 11, and the PVC particles deposited on the bottom of the reactor are dispersed under the action of the loosening gas; pure chlorine gas is input from the raw material gas inlet 13, and the PVC particles are entrained at a relatively high flow rate and pass through quickly Low-temperature plasma reaction zone 5 activates chlorine gas and PVC particles, and chlorination reaction occurs, and the residence time is 60s. The chlorinated polyvinyl chloride particles obtained by the reaction and the unreacted polyvinyl chloride particles go up to the particle downstream baffle plate 3...

Embodiment 2

[0038] The reactor was operated at atmospheric pressure. PVC particles with an average particle size of 150 μm are loaded into the reactor at the polyvinyl chloride raw material feed port 12, and the feed mass is 5 g. The input power of the low temperature plasma power supply is 50W. The reaction temperature was 100°C. Using argon as the loosening gas, it is introduced from the loosening gas inlet 11, and the PVC particles deposited on the bottom of the reactor are dispersed under the action of the loosening gas; the mixed gas of chlorine and argon is input from the raw material gas inlet 13, and the chlorine gas fraction is 80%. Entrained PVC particles pass through the low-temperature plasma reaction zone 5 quickly at a relatively high flow rate, activating chlorine gas and PVC particles, and chlorination reaction occurs, and the residence time is 60s. The PVC granules go up to the baffle plate 3, and flow back to the chlorine migration area 6 under the action of the baffle...

Embodiment 3

[0041] The reactor was operated at atmospheric pressure. PVC particles with an average particle size of 50 μm are loaded into the reactor at the polyvinyl chloride raw material feed port 12, and the feed mass is 5 g. The input power of the low temperature plasma power supply is 100W. The reaction temperature was 60°C. Argon is used as the loosening gas, which is introduced from the loosening gas inlet 11, and the PVC particles deposited at the bottom of the reactor are dispersed under the action of the loosening gas; pure chlorine gas is input from the raw material gas inlet 1 3, and the PVC particles are entrained at a relatively high flow rate to move up quickly Through the low-temperature plasma reaction zone 5, chlorine gas and PVC particles are activated, and a chlorination reaction occurs, and the residence time is 10s. The PVC granules go up to the baffle plate 3, and flow back to the chlorine migration area 6 under the action of the baffle. The mixed gas of argon go...

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Abstract

The invention relates to a spouted bed reactor and a method for synthesizing chlorinated polyvinyl chloride by using low-temperature plasmas. The reactor mainly comprises a reactor main body, a gas and solid separating zone, a gas and solid separating device and the like, wherein the gas and solid separating zone and the gas and solid separating device are arranged at the top of the reactor body.A low-temperature plasma generating device is arranged in the reactor main body and divides the interior of the reactor main body into a low-temperature plasma reaction zone and a granule descending chlorine migration zone. The method of the spouted bed reactor synthesizing chlorinated polyvinyl chloride is characterized in that the polyvinyl chloride is induced to be quickly chloridized by usingthe low-temperature plasmas, and the polyvinyl chloride granules are spouted in a low-temperature plasma discharging zone to generate chloridizing reaction; and the granules carried out of the low-temperature plasma reaction zone by air flow are deposited in the granule descending chlorine migration zone to realize circulation chloridizing of the granules. The invention utilizes the low-temperature plasma method to simultaneously activate chlorine gas and polyvinyl chloride granules at low temperature; and the product efficiency and the product quality are preferably enhanced.

Description

technical field [0001] The invention relates to a method and a reactor for synthesizing chlorinated polyvinyl chloride, in particular to a spouted bed reactor and a method for synthesizing chlorinated polyvinyl chloride with low-temperature plasma, 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, corros...

Claims

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Application Information

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IPC IPC(8): C08F14/06C08F8/22
Inventor 程易卢巍王琦丁石
Owner TSINGHUA UNIV
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