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A reaction system and method for batch production of chlorinated polyvinyl chloride

A chlorinated polyvinyl chloride and reaction system technology, which is applied in the field of intermittent production of chlorinated polyvinyl chloride, can solve the problem of high failure rate of gas-solid phase activation-chlorination integrated fluidized bed device, aggravated separation, reuse or treatment section Burden, poor; Chinese patent application and other issues, to achieve the effect of improving energy efficiency, good use flexibility, and easy operation control

Inactive Publication Date: 2016-07-06
中国平煤神马控股集团有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent application 201010165999.7 discloses a device and method for preparing chlorinated polyvinyl chloride by a gas-solid phase method, using ultraviolet light to activate chlorine gas, and chlorinating polyvinyl chloride in riser reactors and turbulent fluidized bed reactors There is no auxiliary gas path for feeding, and the feeding pipe is prone to clogging, and the uniformity of feeding is poor; Chinese patent application 201210237142.0 discloses a method for synthesizing chlorinated polyvinyl chloride resin by a gas-solid phase method, in a fluidized bed reactor In the study, the synthesis process of chlorinated polyvinyl chloride resin induced by ultraviolet light was studied; Chinese utility model patent 201220324809.6 disclosed a plasma gas-solid phase method for preparing chlorinated polyvinyl chloride device, including the equipment connected in the following order: fluidization The bed reactor, feeding device, riser reactor, and separator are connected to form a closed circuit. The inlet of the gas purifier is connected to the gas outlet of the riser cyclone separator and the gas outlet of the fluidized bed cyclone separator. The outlet is connected to the follow-up production system, and a gas-solid injector is installed at the end of the feeding device connected to the fluidized bed to ensure stable and continuous feeding of the feeding device; the fluidized bed reactor is heated by a jacket, and the temperature is raised in stages
The fluidized bed reactor needs to feed the chlorine gas at a large flow rate and for a long time, which leads to a large amount of exhaust gas (including unreacted chlorine gas and by-product hydrogen chloride gas, etc.) after the chlorination reaction, which greatly increases the subsequent separation. Burden on reuse or treatment section, raising costs
Moreover, a large amount of exhaust gas will take away a considerable amount of heat. In order to maintain a stable temperature in the reactor, it is necessary to continuously replenish heat, resulting in a significant increase in energy consumption.
In addition, the failure rate of gas-solid phase activation-chlorination integrated fluidized bed device is also high

Method used

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  • A reaction system and method for batch production of chlorinated polyvinyl chloride

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Effect test

Embodiment 1

[0037] Such as figure 1 Shown is a schematic flowchart of an embodiment provided by the present invention. This chlorination reaction system comprises chlorination reactor 6 and plasma generator 12; Vacuum pump 10 and argon cylinder 11 constitute the auxiliary system of plasma generator 12; Chlorine cylinder 1, measuring scale 2, liquid chlorine vaporizer 3, chlorine buffer tank 4 And the chlorine gas flowmeter 5 constitutes a chlorine gas pretreatment system; the washing kettle 7, the centrifuge 8 and the drying box 9 constitute a chlorinated polyvinyl chloride treatment system; the tail gas absorption tank 13 is a tail gas absorption system; the blower 14 and the dryer 15 constitute a purging system . Wherein the chlorination reactor 6 adopts jacketed hot water heating mode, adopts an automatic temperature control device to control the reaction temperature, and the chlorine flow meter 5 adopts a float type flow meter.

[0038] Take a certain amount of polyvinyl chloride po...

Embodiment 2

[0040]Take a certain amount of polyvinyl chloride powder (chlorine content is 56.1%) and put it into the plasma generator 12, evacuate to 10Pa, then fill nitrogen to about 100Pa, and then evacuate to 10Pa; continue to fill nitrogen and keep the vacuum pump running, wait for When the vacuum degree is stable at about 50Pa, the discharge starts, and the power is 130W to generate nitrogen plasma to activate the polyvinyl chloride for 20 minutes; the activated polyvinyl chloride is transferred to the chlorination reactor 6 . Start the chlorination reactor 6 agitator, keep the rotating speed 45r / min, open the chlorine cylinder, after the liquid chlorine vaporizes, enter the chlorination reactor 6 through the chlorine buffer tank 4 and the flow meter 5, and start to feed hot water at the same time to heat it , keep the temperature at 70°C; feed chlorine gas three times the theoretical amount, and after 6 hours of reaction, stop the chlorine gas flow and stop heating at the same time, ...

Embodiment 3

[0042] Take a certain amount of polyvinyl chloride powder (chlorine content is 56.1%) and put it into the plasma generator 12, evacuate to 50Pa, then fill helium to about 500Pa, and then evacuate to 50Pa; continue to fill helium and keep the vacuum pump running , when the vacuum degree is stabilized at about 200Pa, the discharge starts, and the power is 180W to generate helium plasma to activate the polyvinyl chloride for 30 minutes; the activated polyvinyl chloride is transferred into the chlorination reactor 6. Start the agitator of the chlorination reactor 6, keep the rotating speed at 50r / min, open the chlorine cylinder, and after the liquid chlorine is vaporized, enter the chlorination reactor 6 through the chlorine buffer tank 4 and the flow meter 5, and start to feed hot water at the same time to heat it , keep the temperature at 90°C; feed 4 times the theoretical amount of chlorine gas, and after 3 hours of reaction, stop the chlorine gas flow and stop heating at the sa...

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Abstract

The invention discloses a reaction system and method for batch production of chlorinated polyvinyl chloride. The reaction system mainly includes a liquid chlorine vaporizer, a chlorine gas buffer tank, an activation reactor and a chlorination reactor. A chlorine buffer tank is connected, and an activation reactor is connected to the chlorination reactor. The reaction system of the present invention is not only suitable for the gas-solid phase chlorination reaction of polyvinyl chloride, but also suitable for the gas-solid phase chlorination reaction of other powders. It can not only be used as a chlorination reaction system alone, but also can be combined with other chlorination systems. Used together, it has good flexibility of use. The reaction system and method for intermittently producing chlorinated polyvinyl chloride of the present invention are low in cost, high in product quality, easy to control in operation, high in energy utilization rate, reduced in production cost, and can increase the chlorine content in chlorinated polyvinyl chloride to 65%. above.

Description

technical field [0001] The invention belongs to the field of industrial production of chlorinated high polymers, and relates to a system and method for intermittently producing chlorinated polyvinyl chloride. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) is a new type of engineering plastic obtained by chlorinating and modifying polyvinyl chloride (PVC) resin. After the PVC resin is chlorinated, the irregularity of the molecular chain arrangement increases and the polarity increases, which increases the solubility and chemical stability of the resin, thereby improving the heat resistance of the material and resistance to acids, alkalis, salts, oxidants, etc. corrosion performance. The mechanical properties of the heat distortion temperature of the resin are improved, the chlorine content is increased from 56.7% to 61-69%, the Vicat softening temperature is increased from 72-82°C to 90-125°C, the maximum service temperature can reach 110°C, and the long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/06C08F8/22
Inventor 杨光杰方世东海国栋王旭峰李飞何洪波吴祖杰崔强靳鹏张静张遵刘红民
Owner 中国平煤神马控股集团有限公司
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