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Method for producing tetrafluoroethylene by monochlorodifluoromethane thermal pyrolysis process

A technology of difluoromonochloromethane and tetrafluoroethylene, applied in chemical instruments and methods, halogenated hydrocarbon preparation, organic chemistry, etc., to achieve the effect of making good use of cold and heat, stable quality and reasonable process

Inactive Publication Date: 2012-06-27
TIANJIN TAIHENG GASES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has a reasonable process, but also solves the problem of producing tetrafluoroethylene

Method used

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  • Method for producing tetrafluoroethylene by monochlorodifluoromethane thermal pyrolysis process
  • Method for producing tetrafluoroethylene by monochlorodifluoromethane thermal pyrolysis process

Examples

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Embodiment 1

[0019] A method for producing tetrafluoroethylene by pyrolysis of difluorochloromethane;

[0020] Quantitatively send 1,000 kg / hour of difluorochloromethane into the high-nickel alloy cracking reactor continuously for cracking. The cracking reactor is a tubular furnace structure and can be heated by liquefied gas. The temperature of the cracking reactor is controlled at 800°C, and the pressure Lower than 0.15Mpa; the pyrolysis gas from the pyrolysis reactor is recovered by the preheating boiler, quenched by the quencher and then enters the hydrogen chloride absorber, then add 950 liters / hour water washing and 950 liters / hour alkali washing into the gas cabinet, and then freeze Dehydration, drying, compression and collection into the crude product tank, through multi-tower rectification, removal of light components and part of high boilers, recovery of unreacted HCFC-22, together with part of high boilers returned to the cracking reactor; separation of tetrafluoroethylene V...

Embodiment 2

[0022] The method for producing tetrafluoroethylene by pyrolysis of difluorochloromethane:

[0023] The quantitative 1000-1200 kg / hour of difluorochloromethane is continuously sent to the high-nickel alloy cracking reactor for cracking. The cracking reactor is a tube furnace structure and can be heated by liquefied gas. The temperature of the cracking reactor is controlled at 900 °C , the pressure is lower than 0.15Mpa; the pyrolysis gas from the cracking reactor is recovered by the preheating boiler, and after being quenched by the quencher, it enters the hydrogen chloride absorber, and then adds 1100 liters / hour of water washing and 1100 liters / hour of alkali washing into the gas cabinet, and then After freeze-dehydration, drying, and compression, it is collected into the crude product tank, and through multi-column rectification, light components and part of high boilers are removed, unreacted HCFC-22 is recovered, and part of high boilers are returned to the cracking re...

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Abstract

The invention discloses a method for producing tetrafluoroethylene by monochlorodifluoromethane thermal pyrolysis process, comprising the following steps of: quantifying HCFC-22 to be 1000-1200 kg / h and feeding in a high-nickel-alloy cracking reactor with a tubular furnace structure and capable of heating by using liquefied gas to crack; controlling the temperature of the cracking reactor to be between 800 to 900 DEG C and controlling the pressure thereof to be lower than 0.15 Mpa; quenching the cracked product via a quencher and then feeding in a hydrogen chloride absorber; adding 950-1100 L / h of water and 950-1100 L / h of alkaline to wash, and then feeding in a gas cabinet; freeze-dehydrating, drying and compressing, and then collecting a crude product in a crude product groove; and rectifying by a plurality of towers, and performing post-treatment and separating to obtain a tetrafluoroethylene product. The method disclosed by the invention is reasonable in process and simple in production, as well as is the most simple and ideal method for preparing tetrafluoroethylene.

Description

technical field [0001] The invention relates to a chemical product, in particular to a method for producing tetrafluoroethylene by pyrolysis of chlorodifluoromethane, which is suitable for large-scale production of tetrafluoroethylene. Background technique [0002] This product is a special adhesive for tetrafluoroethylene (XD--301), which is a professional adhesive. It has strong initial adhesion, high final bonding strength, flexible film, good aging resistance, and high temperature resistance of 200 ° C. It can be widely used in the bonding of various tetrafluoroethylene turning sheets, molded sheets and iron, aluminum, and stainless steel metal materials. combine. Tetrafluoroethylene pipe joints, glass, ceramics, etc. The original method cannot obtain pure tetrafluoroethylene. Contents of the invention [0003] The problem to be solved by the present invention is to overcome the deficiencies of the existing methods and provide a method for producing tetrafluoroethyl...

Claims

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Application Information

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IPC IPC(8): C07C21/185C07C17/269
Inventor 李中元
Owner TIANJIN TAIHENG GASES
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