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Device and method for producing polyvinyl chloride through multi-kettle continuous polymerization

A technology of polyvinyl chloride and polymerization kettle, which is applied in the field of multi-pot continuous polymerization to produce polyvinyl chloride, and can solve the problems of excessive waste water generation, low production capacity, and large amount of additives used

Pending Publication Date: 2021-05-18
HUAYANG NEW MATERIAL TECH GRP CO LT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is that the production capacity of the current equipment for producing polyvinyl chloride is low, the consumption of desalted water, the use of auxiliaries is large, and the problem of generating more waste water

Method used

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  • Device and method for producing polyvinyl chloride through multi-kettle continuous polymerization
  • Device and method for producing polyvinyl chloride through multi-kettle continuous polymerization
  • Device and method for producing polyvinyl chloride through multi-kettle continuous polymerization

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Experimental program
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Effect test

Embodiment 1

[0078] like image 3 As shown, it is the first embodiment provided by the present invention. According to the suspension continuous polymerization process, one premixing tank 1 corresponds to two main polymerizing tanks 2, and the outlet of the premixing tank 1 is connected to the inlets of the two main polymerizing tanks 2. They are connected in parallel through a Y-type electric valve, and the Y-type electric valve is used to control the slurry in the premixing kettle 1 to go to the main polymerization kettle 2. The two main polymerization kettles 2 share a set of reflux polymerization kettle 5 and a discharge polymerization kettle 6. The outlets of the two main polymerizers 2 are respectively connected to the centrifugal pump 3 through two sets of discharge pipes 9 and straight pipes 8 with the same configuration.

[0079] The volume of premix tank 1 is 30m 3 , the volume of the two main polymerizers 2 is 48m 3 , the volume of the reflux polymerizer 5 and the discharge po...

Embodiment 2

[0102] like Figure 4 As shown, for the second embodiment provided by the present invention, in order to reduce the amount of continuous polymerization equipment and simplify operation, 3 main polymerization tanks 2 and 3 smaller premix tanks are used to realize semi-continuous polymerization. The main polymerization tank 2 adopts intermittent feeding and discharging, and the pre-mixing tank 1 and the main polymerization tank 2 form 3 groups of polymerization devices in one-to-one correspondence, and each group is connected in parallel with each other, and one pre-mixing tank acts as a discharging polymerization tank 6. One pre-mixing tank serves as the backup tank 11, the outlet of the centrifugal pump 3 is connected to the backup tank 11, and the polymerization reaction is terminated in the discharging polymerization tank 6.

[0103] The production process is as follows:

[0104] (1) Carry out high-pressure water cleaning on each main polymerization kettle 2 and premixing k...

Embodiment 3

[0125] like Figure 5 As shown, in the third embodiment provided by the present invention, in order to speed up the polymerization reaction and shorten the polymerization time, a composite initiator can be used to avoid the "flying temperature phenomenon" in the polymerization reaction, so the segmented initiator method is adopted. The high-efficiency initiator CNP is added in the mixing tank, and the common initiator EHP is added in the main polymerization tank 2. The addition of the high-efficiency initiator can promote the VCM liquid phase to produce primary particles in a short period of time, and the addition of the high-efficiency initiator can Shorten the reaction time and increase the production capacity of a single tank. At the same time, this process is applied to a polymerization tank equipped with a tower top condenser. The reflux condenser 12 is used to condense the gas phase VCM in the tank and transfer the heat in the tank through circulating water. The reflux c...

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Abstract

The invention discloses a device and a method for producing polyvinyl chloride through multi-kettle continuous polymerization, the device comprises a premixing kettle for initial polymerization reaction and a main polymerization kettle for main polymerization reaction which are connected with each other, and the premixing kettle is connected to an inlet of the main polymerization kettle through a large-pipe-diameter pipeline; and an outlet of the main polymerization kettle is sequentially connected to a grading equipment cyclone and a rotary cyclone centrifugal machine through a centrifugal pump, a bottom flow-out pipe of the cyclone is connected with a discharging polymerization kettle used for final-stage polymerization reaction, and an overflow pipeline of the cyclone is connected with the premixing kettle, the backflow polymerization kettle or the main polymerization kettle. According to the invention, through multi-kettle operation, a current PVC batch polymerization process is changed, large-particle PVC in the PVC slurry is separated in time, and small-particle PVC slurry is returned to the premixing kettle or the main polymerization kettle for continuous polymerization reaction, so that continuous polymerization of VCM is realized to a certain extent, the production of process wastewater is reduced, and the working intensity of batch operation of the polymerization kettle is relieved; and automatic control is facilitated.

Description

technical field [0001] The invention relates to the technical field of polyvinyl chloride production, in particular to a device and method for producing polyvinyl chloride by multi-pot continuous polymerization. Background technique [0002] Polyvinyl chloride is one of the five general-purpose plastics in the industry. Polyvinyl chloride is polymerized from VCM through different polymerization processes. At present, there are mainly the following four PVC polymerization production processes in the market: [0003] The first kind of suspension polymerization, currently more than 90% of polyvinyl chloride in the industry is produced by this process. The mechanism of suspension polymerization is free radical polymerization. The polymerization reaction is triggered by the initiator VCM monomer. In the polymerization tank, strong Under the action of mechanical stirring, the water-insoluble VCM monomer is dispersed into droplets and suspended in the water medium dissolved in disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F14/06C08F2/01
CPCC08F14/06C08F2/01
Inventor 李伟斌郭文林姚根有潘登峰赵君朱浩袁悦婷尹进郭琳
Owner HUAYANG NEW MATERIAL TECH GRP CO LT
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