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Tetrafluoroethylene polymerization inhibitor

A technology of tetrafluoroethylene and polymerization inhibitor, applied in the field of polymerization inhibitor, can solve the problems of reducing the purity of tetrafluoroethylene monomer, affecting the effective control of polymerization reaction, and low effective purity.

Inactive Publication Date: 2011-04-27
SHANGHAI 3F NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] But the terpene polymerization inhibitor currently used is a mixture of terpinolene, which is mainly purified by fractionation in turpentine oil, and its effective purity is low, only 40-50%. , will reduce the separation efficiency of rectification, and also reduce the monomer purity of finished tetrafluoroethylene, which will affect the effective control of subsequent polymerization reactions

Method used

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  • Tetrafluoroethylene polymerization inhibitor
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  • Tetrafluoroethylene polymerization inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example compares the influence of different polymerization inhibitors on the oxygen content of the material in the light removal tower of the rectification system

[0037] The annual output of tetrafluoroethylene rectification of the experimental test device is 5000 tons / year

[0038] The oxygen content of the material entering the light removal tower of the rectification system is about 30ppm~50ppm, by adding a terpene polymerization inhibitor (purchased from Taopu Chemical Plant) or limonene of the following formula (purchased from CitrOvita Brazilian Standard Citrus Terpene), using the above-mentioned online formula The oxygen content analysis instrument analyzes the oxygen content, and the results are shown in Table 1 below:

[0039]

[0040] Table 1

[0041]

[0042] The analysis of the data in the above table shows that with the increase of the addition amount of the polymerization inhibitor, the oxygen content in the rectification system is significan...

Embodiment 2

[0046] This example compares the influence of different polymerization inhibitors on the oxygen content of the material in the rectification tower of the rectification system

[0047] The annual output of tetrafluoroethylene rectification of the experimental test device is 5000 tons / year

[0048] The oxygen content of the material entering the rectification system rectification tower is about 1~10ppm, by adding terpene polymerization inhibitor (purchased from Taopu Chemical Factory) or limonene of the following formula (purchased from CitrOvita Brazilian Standard CitrusTerpene), using the above-mentioned online formula The oxygen content analysis instrument analyzes the oxygen content, and the results are shown in Table 2 below:

[0049]

[0050] Table 2

[0051] Addition amount of polymerization inhibitor ml / hr

Oxygen content (ppm, limonene)

Oxygen content (ppm, terpenes)

20

3.1

6.9

40

2.5

6.4

60

1.5

5.2

...

Embodiment 3

[0056] This embodiment comparatively adopts the impact of different polymerization inhibitors on the final polytetrafluoroethylene monomer product

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PUM

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Abstract

The invention discloses a tetrafluoroethylene monomer composition which comprises a tetrafluoroethylene monomer and a limonene polymerization inhibitor. The general formula of the limonene polymerization inhibitor is shown in the specification, wherein, R1 and R2 are the same or different and are respectively C1-4 alkyl; and R3 is R4-CH group, and R4 is hydrogen or C1-4 alkyl.

Description

technical field [0001] The invention relates to a polymerization inhibitor capable of preventing self-polymerization of tetrafluoroethylene. More specifically, the present invention relates to a polymerization inhibitor capable of preventing self-polymerization of tetrafluoroethylene and simultaneously reducing the oxygen content of the system. Background technique [0002] Tetrafluoroethylene is a colorless, odorless, flammable, explosive, and basically non-toxic gas. Under normal pressure and temperature, its spontaneous combustion concentration in air is 10%-44% (V / V), and its flash point is 620°C, it can cause a sudden explosion when it encounters an open flame; the volume limit of its explosion is very wide, within the range of 46.4%-73.6% (0.1MPa) and 5%-97% (2MPa). [0003] Tetrafluoroethylene monomer is an extremely unstable olefin substance. Under storage conditions or in the process of production, without a polymerization inhibitor, as long as the external conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/185C07C17/42
Inventor 曾韬张卫东
Owner SHANGHAI 3F NEW MATERIAL