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Method and device for continuously producing chlorinated polyvinyl chloride by low-temperature plasma circulating bed

A technology of low-temperature plasma and chlorinated polyvinyl chloride, which is applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physicochemical processes using energy, etc., can solve problems such as production efficiency decline and waste of raw materials. Achieve the effect of prolonging equipment life and saving energy consumption

Active Publication Date: 2012-07-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method can avoid problems such as production efficiency decline and raw material waste caused by reactor shutdown.

Method used

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  • Method and device for continuously producing chlorinated polyvinyl chloride by low-temperature plasma circulating bed
  • Method and device for continuously producing chlorinated polyvinyl chloride by low-temperature plasma circulating bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] PVC particles with an average particle size of 150 μm are loaded into the first fluidized bed through the charging port, and the charging amount is 1 ton. Turn on the circulation fan to blow Cl 2 Concentration of 30% Cl 2 / Ar mixed gas is passed into the fluidized bed, and the stirring is started to make the PVC particles well fluidized. Add heating oil to the jacket to keep the temperature of PVC particles in the fluidized bed at 100°C. The control valve between the first fluidized bed and the low-temperature plasma down-bed reactor is opened to allow PVC particles to enter the low-temperature plasma down-bed reactor and the riser reactor to initiate chlorination in the low-temperature plasma zone. The riser and downer bed are operated under normal pressure, the temperature is 100°C, and the particle residence time is 20s. Solid PVC particles are separated by gas and solid, and returned to the first fluidized bed to complete a particle cycle. The residence time of ...

Embodiment 2

[0030] PVC particles with an average particle size of 200 μm are loaded into the first fluidized bed through the charging port, and the charging amount is 1 ton. Turn on the circulation fan to blow Cl 2 Concentration of 30% Cl 2 / Ar mixed gas is passed into the fluidized bed, and the stirring is started to make the PVC particles well fluidized. Add heating oil to the jacket, gradually raise the temperature of the particles from 70°C to a constant temperature, and keep the temperature of the PVC particles in the fluidized bed at 100°C. The control valve between the first fluidized bed and the low-temperature plasma down-bed reactor is opened to allow PVC particles to enter the low-temperature plasma down-bed reactor and the riser reactor, and chlorination is initiated in the low-temperature plasma zone. The riser and downer are operated under normal pressure, the temperature is 20°C, and the particle residence time is 2min. Solid PVC particles are separated by gas and solid,...

Embodiment 3

[0033] PVC particles with an average particle size of 150 μm are loaded into the first fluidized bed through the charging port, and the charging amount is 1 ton. Turn on the circulation fan to blow Cl 2 Concentration of 30% Cl 2 / Ar mixed gas is passed into the fluidized bed, and the stirring is started to make the PVC particles well fluidized. Add heating oil into the jacket and gradually raise the temperature to make the maximum temperature of PVC particles in the fluidized bed rise to 140°C. The control valve between the first fluidized bed and the low-temperature plasma down-bed reactor is opened to allow PVC particles to enter the low-temperature plasma down-bed reactor and the riser reactor to initiate chlorination in the low-temperature plasma zone. The riser and downer are operated under normal pressure, the temperature is 140°C, and the particle residence time is 10s. Solid PVC particles are separated by gas and solid, and returned to the first fluidized bed to com...

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Abstract

The invention discloses a method and device for continuously producing chlorinated polyvinyl chloride by a low-temperature plasma circulating bed, relating to a production technology and equipment for macromoleclar polymer chlorinated polyvinyl chloride. The device comprises a chlorinated polyvinyl chloride particle storage bin, a chlorinated polyvinyl chloride storage bin, two parallel fluidizedbed reactors, two parallel riser reactors, a downer, a tail gas purifier and two circulating fans which are respectively used for transporting riser conveying gas and transporting raw material gas. In the device, the low-temperature plasma is utilized to simultaneously activate chlorine and PVC (poly vinyl chloride) raw material particles to quickly chloridize PVC in the circulating fluidized bed; and meanwhile, two groups of fluidized bed reactors are adopted for operation in turn to realize continuous production. Thus, the problems of low production efficiency and the like brought by that the reactor stops and unloads can be avoided, the phenomenon that fans, tail gas processors and the like are restarted after stopping can be eliminated, energy consumption is saved, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to a method and device for gas-solid phase synthesis of chlorinated polyvinyl chloride (CPVC), in particular to a method for continuously producing CPVC using a low-temperature plasma circulating fluidized bed reactor, which belongs to a polymer material in the chlor-alkali industry synthesis 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% to 70%, theoretically up to 73.2%. Generally, the chlorine content of CPVC is 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/06C08F8/22B01J8/38B01J8/26B01J19/08
Inventor 程易卢巍曹腾飞
Owner TSINGHUA UNIV
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