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Trifluoroethylene recovery method and device thereof

A technology of trifluoroethylene and recovery method, applied in chemical instruments and methods, halogenated hydrocarbon preparation, organic chemistry, etc., can solve the problems of huge investment in catalysts and equipment and high price of trifluoroethylene

Active Publication Date: 2009-10-07
SHANGHAI 3F NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above synthesis method needs to build a special synthesis and separation device, and the investment in catalyst and equipment is huge, resulting in a high price of the product trifluoroethylene

Method used

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  • Trifluoroethylene recovery method and device thereof
  • Trifluoroethylene recovery method and device thereof
  • Trifluoroethylene recovery method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Use a batch type rectification tower to separate tetrafluoroethylene and recover the top material. The composition is shown in Table 2. The inner diameter of the rectification tower is φ53mm, with 3mm×3mm stainless steel calendered ring packing inside, the packing height is 6000mm, and the tower kettle is 60L. Add raw material 45Kg in tower kettle. Control the temperature of the tower kettle at -2~0°C, the temperature at the top of the tower at -24~-26°C, and the operating pressure of the tower at 0.78MPa. When the content of tetrafluoroethylene in the gas phase at the top of the tower is 100 wt%, the reflux ratio is controlled to be 10-12:1, and the gas phase at the top of the tower is used to recover the tetrafluoroethylene to the low-pressure system. Analyze the composition of the gas phase at the top of the tower every 0.5h. After 16h, the content of trifluoroethylene in the top of the tower is greater than 1wt%. The rectification enters the transition section, and...

Embodiment 2

[0059] The tower equipment used in this embodiment is the same as that in Embodiment 1, and the raw material composition is shown in Table 2. Add raw material 45Kg in tower kettle. Control the temperature of the tower kettle at -2~0°C, the temperature of the tower top at -24~-26°C, and the operating pressure of the tower at 0.75MPa. When the content of tetrafluoroethylene in the gas phase at the top of the tower is 100 wt%, the reflux ratio is controlled to be 10-12:1, and the gas phase at the top of the tower is used to recover the tetrafluoroethylene to the low-pressure system. The composition of the gas phase at the top of the tower is analyzed every 0.5 hours. After 9 hours, the content of trifluoroethylene at the top of the tower is greater than 1wt%. The rectification enters the transition section, and the alternate operation of total reflux and partial reflux is adopted, that is, after 1 hour of total reflux, the extraction is 0.5h Frequency operation, control reflux r...

Embodiment 3

[0061]The tower equipment used in this embodiment is the same as that in Embodiment 1, and the raw material composition is shown in Table 2. Add raw material 50Kg in tower kettle. Control the temperature of the tower kettle at -2~0°C, the temperature of the tower top at -24~-26°C, and the operating pressure of the tower at 0.76MPa. When the content of tetrafluoroethylene in the gas phase at the top of the tower is 100 wt%, the reflux ratio is controlled to be 10-12:1, and the gas phase at the top of the tower is used to recover the tetrafluoroethylene to the low-pressure system. The composition of the gas phase at the top of the tower is analyzed every 0.5 hours. After 14 hours, the content of trifluoroethylene in the top of the tower is greater than 1wt%. The rectification enters the transition section, and the alternate operation of total reflux and partial reflux is adopted, that is, after 1 hour of total reflux, the extraction is 0.5h Frequency operation, control the refl...

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Abstract

Disclosed is a trifluoroethylene recovery method and the device thereof. The method comprises: (1) rectifying and separating step: including rectifying and recovering tetrafluoroethlene product from cracked gas, and loading the distillations containing trifluoroethene, part of tetrafluorethylene and other components into the tetrafluoroethlene recovering step; (2) tetrafluoroethlene recovering step: including rectifying and recovering the distillates containing trifluoroethene and tetrafluorethylene from the distillations containing trifluoroethene, part of tetrafluorethylene and other components; and (3) cycling step: including cycling the distillates containing trifluoroethene and tetrafluorethylene to the rectifying and separating step. The invention is characterized in that: the method further comprises a trifluoroethylene concentration monitoring step before applying the above cycling step; when the trifluoroethylene concentration reaches a predetermined value, the method also comprises a step for rectifying and separating the distillates containing trifluoroethene and tetrafluorethylene.

Description

technical field [0001] The invention relates to a method and equipment for separating and recovering high-purity trifluoroethylene from by-products produced from tetrafluoroethylene. Background technique [0002] At present, the organic fluorine industry generally adopts the steam dilution cracking method of difluorochloromethane (F22) to produce tetrafluoroethylene monomer, and a small amount of trifluoroethylene is produced as a by-product during this process. Since trifluoroethylene has extremely adverse effects on the thermal and chemical stability of tetrafluoroethylene polymers, the content of trifluoroethylene in tetrafluoroethylene should be at the ppm level. [0003] The commonly used tetrafluoroethylene rectification process flow of the prior art is such as figure 1 shown. figure 1 The rectification system shown mainly includes light removal tower 1, tetrafluoroethylene rectification tower 2, tetrafluoroethylene recovery tower 3, raw material recovery tower 4, ga...

Claims

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Application Information

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IPC IPC(8): C07C21/18C07C21/185C07C17/383
Inventor 车延超粟小理蒋振宁
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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