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Device and method for cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene

A technology of difluorochloromethane and tetrafluoroethylene, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve problems such as difficult operation and high energy consumption, and achieve high flexibility and selectivity Good, the effect of reducing emissions

Active Publication Date: 2015-12-16
衢州市鼎盛化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention proposes a device and method for cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene, which solves the problem of the need for two sets of equipment, high energy consumption and difficult operation in the prior art for preparing tetrafluoroethylene and hexafluoropropylene technical issues

Method used

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  • Device and method for cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene
  • Device and method for cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene
  • Device and method for cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene

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Experimental program
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Effect test

Embodiment 1

[0052] Use the above-mentioned cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene device 2 to crack R22 to prepare tetrafluoroethylene and hexafluoropropylene, including:

[0053] The cooling unit is in the figure 2 location shown.

[0054] The heating body heats the reaction chamber of the inner and outer circular tubes to 650°C; the R22 gas that has been preheated to 450°C enters the device from the gas inlet, and is heated rapidly to produce tetrafluoroethylene and hexafluoropropylene.

[0055] After the gas in the device is indirectly cooled by the water in the cooling chamber, a mixture is obtained at the product gas outlet.

[0056] After chemical analysis, the components are shown in Table 1.

[0057]

Embodiment 2

[0059] Use the above-mentioned cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene device 2 to crack R22 to prepare tetrafluoroethylene and hexafluoropropylene, including:

[0060] The lower part of the cooling unit is in the figure 2 B1 position shown.

[0061] The heating body heats the reaction chamber of the inner and outer circular tubes to 850°C; the R22 gas that has been preheated to 450°C enters the device from the gas inlet, and is heated rapidly to produce tetrafluoroethylene and hexafluoropropylene.

[0062] After the gas in the device is indirectly cooled by the water in the cooling chamber, a mixture is obtained at the product gas outlet.

[0063] After chemical analysis, the components are shown in Table 2.

[0064]

Embodiment 3

[0066] Use the above-mentioned cracking difluorochloromethane to prepare tetrafluoroethylene and hexafluoropropylene device 2 to crack R22 to prepare tetrafluoroethylene and hexafluoropropylene, including:

[0067] The top of the cooling unit is figure 2 B2 position shown in .

[0068] The heating body heats the reaction chamber of the inner and outer circular tubes to 850°C; the R22 gas that has been preheated to 450°C enters the device from the gas inlet, and is heated rapidly to produce tetrafluoroethylene and hexafluoropropylene.

[0069] After the gas in the device is indirectly cooled by the water in the cooling chamber, a mixture is obtained at the product gas outlet.

[0070] After chemical analysis, the components are shown in Table 3.

[0071]

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Abstract

The invention provides a device and method for preparing tetrafluoroethylene and hexafluoropropylene through cracking monochlorodifluoromethane. The device comprises an air inlet cavity which is arranged at the upper end of the device, a reaction cavity communicated with the lower part of the air inlet cavity, a cooling cavity communicated with the lower part of the reaction cavity, and an air outlet cavity communicated with the lower part of the cooling cavity, wherein the air inlet cavity is wider than the reaction cavity; the air outlet cavity is wider than the reaction cavity; the reaction cavity is F in width, Al in height and W1 in length; a heating body is arranged outside the reaction cavity. The method comprises the steps: cracking monochlorodifluoromethane gas to obtain tetrafluoroethylene gas, and further cracking the tetrafluoroethylene gas to obtain hexafluoropropylene; and cooling and outputting the hexafluoropropylene. According to the device and the method provided by the invention, the investment cost is greatly reduced, the safety is improved and energy is saved; gas generated from side reaction can be repeatedly used, the cost is saved and the environment is protected.

Description

technical field [0001] The invention relates to the field of preparation of tetrafluoroethylene and hexafluoropropylene, in particular to a device and method for preparing tetrafluoroethylene and hexafluoropropylene by cracking difluorochloromethane. Background technique [0002] Difluorochloromethane, molecular formula CHClF2, alias Freon-22, abbreviated as R22. Colorless, almost odorless gas; non-flammable; slightly soluble in water. It is used as refrigerant, raw material of polytetrafluoroethylene resin and fire extinguishing agent, etc. [0003] Tetrafluoroethylene, chemical English name: tetrafluoroethylene; Chinese name 2: perfluoroethylene; English name 2: TFE; molecular formula: C2F4; structural formula: CF2=CF2; molecular weight: 100.01; CAS number: 116-14-3. Properties: Colorless and odorless gas. Melting point -142.5°C, boiling point -76.3°C, insoluble in water. heavier than air. The relative density is 1.519, the critical temperature is 33.3°C, the critical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/269C07C21/185C07C21/18
Inventor 应盛荣姜战应悦
Owner 衢州市鼎盛化工科技有限公司
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