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Method and device for purifying tetrafluoroethylene polymerization reaction kettle recovery gas

A polymerization reactor, tetrafluoroethylene technology, applied in chemical instruments and methods, separation methods, halogenated hydrocarbon disproportionation separation/purification, etc., can solve the problems affecting the normal production of the device, product quality, equipment, pipeline and instrument blockage, etc.

Active Publication Date: 2022-06-21
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of paraffin wax accumulated in the recovered gas, it will often cause different degrees of clogging of equipment, pipelines, instruments, etc., seriously affecting the normal production of the device, and will also have a certain impact on product quality

Method used

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  • Method and device for purifying tetrafluoroethylene polymerization reaction kettle recovery gas
  • Method and device for purifying tetrafluoroethylene polymerization reaction kettle recovery gas
  • Method and device for purifying tetrafluoroethylene polymerization reaction kettle recovery gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a method for purifying recovered gas from a tetrafluoroethylene polymerization reactor.

[0048] The temperature of the recovered gas from the treated tetrafluoroethylene polymerization reactor is about 40-50° C., and it contains about 2-5% (w / w) of gas-phase paraffin. The actual measured value of the content of gas-phase paraffin fluctuates, and the average value is about 4%.

[0049] The recovered gas from the polymerization reactor is continuously fed into the spray tower, flows upward in the spray tower, and is in countercurrent contact with the spray liquid sprayed from the upper part of the spray tower, and the spray liquid is calcium chloride brine. The top pressure of the spray tower is 0.05~0.1MPa; the temperature of the lower part of the tower, that is, the lower part of the tower body, is -10~-15℃; the temperature of the tower still is 45~50℃. The spray density of the spray liquid is 8-12m 3 / m 2 〃h. The lower part of the tower bo...

Embodiment 2

[0057] In this example, the liquid-phase paraffin obtained in Example 1 was treated. Specifically, paraffin wax liquid is granulated in water to make paraffin wax solid particles.

[0058] The granulation process is carried out in a granulation tank, which is filled with water. See Figure 1-3 As shown, the inner cavity of the granulation tank 6 is provided with an extruder 7, which divides the inner cavity of the granulation tank 6 into an upper chamber arranged up and down and a lower chamber for filling paraffin liquid , the chamber wall of the upper chamber is provided with a paraffin particle outlet 10, the lower chamber is communicated with the paraffin liquid outlet of the spray tower through the paraffin conveying pipeline 5, and the extruder 7 has the function of connecting the upper chamber and the lower chamber. In the process of paraffin floating from bottom to top, the paraffin wax particles are extruded to form holes 11 .

[0059] The paraffin particle forming...

Embodiment 3

[0071] This embodiment provides a purification device for the recovered gas from a tetrafluoroethylene polymerization reactor, see Figure 1-Figure 3 As shown, the purification device includes a spray tower system for purification and a granulation system for granulating liquid paraffin.

[0072] As shown, the device includes a granulation tank 6 and a spray tower 1 with an outlet for paraffin liquid.

[0073] The lower part of the spray tower 1 is the spray tower tower kettle 2. The spray tower tower body is provided with a tetrafluoroethylene polymerization reactor recovery gas inlet 3 near the tower kettle, and the spray tower tower top is the purification recovery gas outlet 4. The spray tower The tower kettle 2 is provided with a middle overflow port, that is, a paraffin liquid outlet, and the middle overflow port is connected with the paraffin transportation pipeline 5, and the upper layer liquid paraffin in the tower kettle enters the granulation tank 6 through the para...

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Abstract

The invention belongs to the technical field of fluorine chemical industry, particularly discloses a purification method of tetrafluoroethylene polymerization reactor recovery gas, and also discloses a purification device. According to the purification method of the tetrafluoroethylene polymerization reaction kettle recovered gas, the purified recovered gas is obtained through separation of the spray tower, the purified recovered gas comes out of the top of the spray tower and then returns to a tetrafluoroethylene monomer device to be reused, and paraffin liquid is obtained through separation in a tower kettle of the spray tower; and then the paraffin liquid is granulated, natural buoyancy is utilized, and the paraffin particles with high purity are obtained through extrusion of the small holes and can be reused. According to the purification method, on one hand, high-purity recycled gas is obtained, the phenomenon that instruments, pipelines and the like are blocked due to the fact that paraffin exists in the recycled gas can be avoided, paraffin particle products are obtained, and good economic benefits are created.

Description

technical field [0001] The invention relates to the technical field of fluorine chemical industry, in particular to a method for purifying recovered gas from a tetrafluoroethylene polymerization reactor, and a device for purification. Background technique [0002] Polytetrafluoroethylene (PTFE) resin has excellent chemical stability, corrosion resistance, sealing, high lubricity, non-stickiness, electrical insulation and good aging resistance, and is currently widely used in aviation, electronics, chemicals, machinery , construction and pharmaceutical industries. [0003] PTFE resin is mainly divided into dispersion and suspension resin according to the preparation process. Among them, the dispersion polymerization of tetrafluoroethylene (TFE) is to initiate the polymerization of tetrafluoroethylene in the aqueous phase through the dispersion of the initiator to form a stable dispersion liquid. In the dispersion polymerization of tetrafluoroethylene, an emulsifier needs to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00B01D53/14B01D53/18B01J2/20C07C17/38C07C21/185
CPCB01D53/002B01D53/14B01D53/1418B01D53/1493B01D53/18B01J2/20C07C17/38C07C21/185
Inventor 谢小刚曾本忠陈炯张金刚胡彬
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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