Apparatus and method for preparing chlorinated polyvinyl chloride through continuous gas-solid phase process

A chlorinated polyvinyl chloride, gas-solid phase technology, applied in the direction of chemical instruments and methods, chemical/physical processes, chemical/physical/physicochemical processes that apply energy, etc., can solve the problem of non-continuous production and uncontrollable reactor operation parameters and other issues, to achieve stable equipment operation, save fixed investment costs, and reduce the volume of the reactor

Active Publication Date: 2015-10-14
TSINGHUA UNIV +1
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  • Abstract
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Problems solved by technology

"A device and method for preparing chlorinated polyvinyl chloride by gas-solid phase method" invented by Wang Jianying of Hebei University of Science and Technology, adopts the form of circulating fluidized bed reactor, and uses ultraviolet light to initiate the reaction, but it cannot be produced continuously
"Multi-layer bed reactor and method for synthesis of chlorinated polyvinyl chloride by low-temperature plasma" (ZL201110061404.8) and "Continuous production of chlorinated polyvinyl chloride by low-temperature plasma circulating bed" invented by Cheng Yi of Tsinghua University Reaction Engineering Laboratory Method and device" (ZL201110061421.1) proposed two continuous gas-solid phase production methods: multi-layer fluidized bed and circulating fluidized bed, but both of them use low-temperature plasma to initiate chlorination reaction, and they cannot meet the requirements of PVC chlorination. Control the various operating parameters of the reactor at different stages

Method used

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  • Apparatus and method for preparing chlorinated polyvinyl chloride through continuous gas-solid phase process
  • Apparatus and method for preparing chlorinated polyvinyl chloride through continuous gas-solid phase process
  • Apparatus and method for preparing chlorinated polyvinyl chloride through continuous gas-solid phase process

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Experimental program
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Effect test

Embodiment 1

[0038] a. Add existing CPVC granules in three fluidized beds, chlorine content 67.5%. Close the first valve 19a and the second valve 19b between the first and second fluidized bed reactors and the second and third fluidized bed reactors, and close the PVC feed port and the CPVC discharge ports 18 and 21 . Open nitrogen bottle 16, fluidization certain hour. At this moment, the gas enters the tail gas absorption tower 10 before the first chlorine circulation pump 4, the second chlorine circulation pump 5 and the third chlorine circulation pump 6, and the bed particles are in a fluidized state, and the oxygen is displaced away;

[0039] b. Turn on the gas circulation pump so that nitrogen returns to each reactor inlet through the first chlorine circulation pump 4, the second chlorine circulation pump 5 and the third chlorine circulation pump 6, and slowly turn down the nitrogen cylinder 16 to completely close. At this point, all fluidized bed reactors are in a self-circulating s...

Embodiment 2

[0044] in such as figure 1 In the shown equipment of the present invention, PVC with a particle diameter of 100-200 microns is used as the raw material, the inert gas is nitrogen, and the intake chlorine gas integration rate is 90%. The temperature of the first fluidized bed reactor is controlled at 80°C, the integral rate of chlorine gas is 60%, and the residence time of the raw material is 3h; the controlled temperature of the second fluidized bed reactor is 90°C, the integral rate of chlorine gas is 65%, and the residence time of the raw material is 3h, the temperature of the third fluidized bed reactor was controlled at 120°C, the gas integration rate of chlorine was 80%, and the residence time of the raw material was 4h; the operating pressure of the three fluidized bed reactors was 0.12Mpa, and the wavelength of the ultraviolet lamp was 365nm. The bed superficial gas velocity is 0.4m / s. After the system is stable, the first chlorine circulation pump circulates 70% of th...

Embodiment 3

[0051] a. Add existing CPVC granules in three fluidized beds, chlorine content 67.5%. Close the first valve 19a and the second valve 19b between the first and second fluidized bed reactors and the second and third fluidized bed reactors, and close the PVC feed port and the CPVC discharge ports 18 and 21 . Open the 16 valves of the nitrogen cylinder, and fluidize for a certain period of time. At this time, the gas enters the tail gas absorption tower before the chlorine circulation pump 4. At this time, the bed particles are in a fluidized state, and the oxygen is replaced;

[0052] b. Turn on the gas circulation pump, so that the nitrogen gas circulates through the pump 4 and returns to the air inlet of each reactor, and slowly adjust the valve of the nitrogen cylinder 16 until it is completely closed. At this point, all fluidized bed reactors are in a self-circulating state. Turn on each fluidized bed reactor heating device and gas heating device, and start the tail gas ab...

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Abstract

The invention provides an apparatus and method for preparing chlorinated polyvinyl chloride through a continuous gas-solid phase process, belonging to the technical field of preparation technology and equipment for chemical materials. The apparatus is composed of three gas-solid fluidized beds and corresponding chlorine circulating pumps, wherein the previous two fluidized beds are provided with ultraviolet lamps, and the third fluidized bed is not provided with ultraviolet lamps. According to the method, a polyvinyl chloride (PVC) raw material successively passes through the three gas-solid fluidized beds; particles stay in each fluidized bed reactor for a period of time; fluidization by using gas mixtures with different chlorine concentrations is respectively carried out in the fluidized bed reactors at different temperatures; and a CPVC (chlorinated polyvinyl chloride) product with chlorine content reaching the standard is eventually obtained. According to the invention, since the fluidized bed reactors capable of continuous feeding and chlorination are adopted, the volume of the reactors are reduced to more than two times of the volume of a conventional gas-solid phase reactor capable of intermittent feeding under the condition of same production power, and the apparatus has the advantages of good temperature control during reaction and a high chlorine conversion rate; and the method is simple, is free of waste water discharge and produces products with stable quality.

Description

technical field [0001] The invention belongs to the technical field of chemical technology and equipment, in particular to a process method and equipment for continuously preparing chlorinated polyvinyl chloride by using polyvinyl chloride and chlorine gas as raw materials for gas-solid phase reaction, and belongs to the synthesis of a polymer material in the chlor-alkali industry craft. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) is a new type of high-performance plastic, which is made by reacting polyvinyl chloride (PVC) with chlorine gas, and the chlorine content increases from 56.8% of PVC to 60%-70%. Due to the introduction of chlorine, the polarity of the polymer chain is enhanced, and CPVC has better heat resistance, corrosion resistance, and aging resistance, and the Vicat softening temperature of its products reaches 90-125 °C. [0003] In the industrial chain of my country's chlor-alkali industry, downstream chlorine-consuming products cann...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/24B01J19/12C08F14/06C08F8/22
Inventor 程易杨千里周治明
Owner TSINGHUA UNIV
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