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Method for preparing fluorine gas in organic fluorine residual liquid

A technology of organic fluorine and residual liquid, applied in the direction of fluorine/hydrogen fluoride, fluorine, etc.

Inactive Publication Date: 2010-06-16
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
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Problems solved by technology

At present, almost all organic fluorine residues are pyrolyzed and incinerated in the presence of oxygen, and then processed by water washing and alkali washing. Finally, C elements combine with O in the air to form CO2 and vent , and F elements combine with H in water to generate about 30% hydrofluoric acid, that is, the final fluorine element exists in the form of hydrofluoric acid aqueous solution, so it can only be sold as a low-grade by-product

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  • Method for preparing fluorine gas in organic fluorine residual liquid

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Embodiment

[0022] 1. Working principle:

[0023] Plasma uses the plasma moment or plasma beam generated between the electrodes to generate high temperature. The plasma moment or plasma beam can be generated by AC, DC, power frequency and high frequency methods. The arc (beam) core temperature can reach above 7000 °C. And can achieve high temperature instantly.

[0024] Hazardous waste is quickly broken down into individual ions and atomic structures in an energy-dense plasma furnace. Such as decomposing organic matter into elements such as carbon, hydrogen, chlorine, and molecular structures such as CO.

[0025] Both the raffinate for preparing tetrafluoroethylene and the raffinate for preparing hexafluoropropylene are organic mixtures mainly composed of C and F elements. Under the action of the plasma high-temperature arc, the chemical bonds of these organic substances are all broken, and finally a mixture mainly composed of carbon black and fluorine gas is formed. After the mixture ...

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Abstract

The invention provides a method for preparing fluorine gas in organic fluorine residual liquid, which comprises the following steps: under the condition of no oxygen, directly cracking the organic fluorine residual liquid under the action of high temperature electric arc, thereby breaking the chemical bonds, such as C, F, H Cl and the like, in the organic substances into C, F2, and small amounts of H2, Cl2, HF, HCL and other substances; and cooling the substances, filtering, rectifying and treating with other methods, thereby obtaining F2 with high purity, which is used as the raw material of SF6, NF3 and the like for cycle use.

Description

technical field [0001] The present invention relates to a method for preparing fluorine gas from organic fluorine raffinate, in particular to a method for preparing fluorine gas by directly cracking organic fluorine raffinate under the action of high-temperature electric arc under anaerobic conditions. Background technique [0002] During the pyrolysis of difluorochloromethane to prepare tetrafluoroethylene, a small amount of hexafluoropropylene, octafluorocyclobutane and trace amounts of octafluoroisobutene will be produced. A small amount of octafluorocyclobutane and octafluoroisobutene are also produced during the cracking of tetrafluoroethylene to prepare hexafluoropropylene. Since octafluoroisobutene is a highly toxic substance and one of the important substances checked by the United Nations for the Prohibition of Chemical Weapons (OPCW), these two residual liquids can only be disposed of by high-temperature incineration. At present, almost all organic fluorine residu...

Claims

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Application Information

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IPC IPC(8): C01B7/20
Inventor 谢学端王家贵曾本忠张金刚张劲松徐美燚
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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