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Method for separating trifluoroethylene from tetrafluoroethylene pyrolysis gas

A technology of trifluoroethylene and tetrafluoroethylene, applied in chemical instruments and methods, disproportionation separation/purification of halogenated hydrocarbons, preparation of halogenated hydrocarbons, etc., can solve the problem of high price of extraction agent ionic liquid, high investment cost and energy consumption problems, to achieve zero emissions and reduce environmental costs

Active Publication Date: 2020-04-21
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN201610701079.X Shandong Dongyue Polymer New Material Co., Ltd. Chen Yue and others invented a method of using ionic liquid as an extraction agent to recover trifluoroethylene with a purity of 99.99% from tetrafluoroethylene by-products by means of extraction and rectification. This method overcomes the defects of the existing tetrafluoroethylene production equipment in recovering trifluoroethylene, and realizes the separation of high-purity trifluoroethylene. Analytic tower, extraction agent ionic liquid is expensive, investment cost and energy consumption are high

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  • Method for separating trifluoroethylene from tetrafluoroethylene pyrolysis gas

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Embodiment 1

[0029] The material after tetrafluoroethylene cracking gas goes through acid removal, water removal, light removal tower and finished product tower contains 4% tetrafluoroethylene, 7.04% trifluoroethylene, 8.3% hexafluoropropylene, 78.47% difluorochloromethane, octafluoroethylene Isobutene 2.19%, this stream is fed in the middle part of the pre-fractionation section (2) of the dividing wall tower, and the vertical wall (5) of the dividing wall tower has 53 theoretical plates on both sides, and there are 28 theoretical plates in the common part of the vertical wall (5) top , the common stripping section (3) of the vertical wall (5) bottom has 17 theoretical plates, the operating pressure of the next wall tower is 10 atm, the reflux ratio of the top of the next wall tower is 30, and the TFE content of the extraction material (D) at the top of the next wall tower is 82.6%. The content of trifluoroethylene in the tower side line extraction material (S) is 96.1%, and the extraction ...

Embodiment 2

[0031] The material after tetrafluoroethylene cracking gas goes through acid removal, water removal, light removal tower and finished product tower contains 6% tetrafluoroethylene, 0.6% trifluoroethylene, 10% hexafluoropropylene, 80% difluorochloromethane, octafluoroethylene Isobutene 3.4%, this flow is fed in the middle part of the pre-fractionation section (2) of the dividing wall tower, and the vertical wall (5) of the dividing wall tower has 60 theoretical plates on both sides, and the common part of the vertical wall (5) has 21 theoretical plates , the common stripping section (3) of the vertical wall (5) bottom has 19 theoretical plates, the operating pressure of the next wall tower is 8atm, the reflux ratio of the top of the next wall tower is 20, and the TFE content of the extraction material (D) at the top of the next wall tower is 99.5%. The content of trifluoroethylene in the extraction material (S) from the side line of the tower is higher than 97.2%, and the extrac...

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Abstract

The invention relates to a method for separating trifluoroethylene from tetrafluoroethylene pyrolysis gas, and belongs to the technical field of pyrolysis gas separation. The method for separating trifluoroethylene from tetrafluoroethylene pyrolysis gas comprises the following steps: pretreating tetrafluoroethylene pyrolysis gas, separating by adopting a dividing wall tower to obtain trifluoroethylene with a purity of more than 95%, and purifying by adopting a rectifying tower to obtain trifluoroethylene with a purity of more than 99.9%. The method is scientific and reasonable in design, can completely recover tetrafluoroethylene, monochlorodifluoromethane, hexafluoropropylene and other key components to obtain the trifluoroethylene product with the purity of more than 99.99% and the polymerizable impurity content of less than 50 ppm, and achieves waste gas reutilization and continuous operability of the device.

Description

technical field [0001] The invention relates to a method for separating trifluoroethylene from cracked gas of tetrafluoroethylene, belonging to the technical field of cracked gas separation. Background technique [0002] The next-door rectification tower is referred to as the next-wall tower, the partition wall tower, and the partition-wall tower—in a traditional rectification tower, a partition wall is welded (or non-welded) along the axial direction of the tower body, and the tower body is divided into left and right sides. A rectification section and a stripping section are shared separately, which can save installation space. As a new thermal coupling technology, the dividing wall column can overcome the deficiencies of heat pump rectification, multi-effect rectification, differential pressure thermal coupling rectification and internal heat integrated rectification, etc., and it is usually better than the traditional two-column sequence when separating a suitable given ...

Claims

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Application Information

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IPC IPC(8): C07C17/383C07C21/18C07C17/38
CPCC07C17/383C07C17/38C07C21/18
Inventor 王军吴春霞王汉利李秀芬高雪玲荆新宇
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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