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Defluorination agent for carbon tetrafluoride anhydrous scission reaction and method of use thereof

A carbon tetrafluoride and water cracking technology, applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of strong corrosion of the reactor, complex operation process, high energy consumption, and achieve high reaction performance, simple preparation process, and easy operation. simple effect

Inactive Publication Date: 2008-09-03
徐秀峰
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the high-temperature calcination method requires the calcination temperature to be above 1000°C, which will not only produce carcinogens such as dioxin, but also obtain a high conversion rate only when the temperature reaches above 1500°C, and the energy consumption is very high
[0004] However, the existing catalytic hydrolysis method for decomposing carbon tetrafluoride waste gas is carried out in the presence of water. With the help of catalysts, carbon tetrafluoride is decomposed into carbon dioxide and hydrogen fluoride. Hydrogen fluoride gas meets water to generate hydrofluoric acid. The device has a strong corrosion effect, and the operation process is complicated

Method used

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preparation example Construction

[0026] The preparation technology of defluorination agent of the present invention is as follows:

[0027] 1. The basic composition of the defluorination agent is: sodium fluoride, metal oxide, silicon powder.

[0028] 2. Sodium fluoride and silicon powder are commercial chemicals.

[0029] 3. The metal oxide is: any one of aluminum oxide, lanthanum oxide, cerium oxide, calcium oxide or magnesium oxide, or two or more of them mixed in any proportion.

[0030] 4. The preparation method of metal oxides: prepare nitrate solution, add lye dropwise, wash the precipitate, and roast at 750--850°C.

[0031] 5. When calcium oxide is used as the metal oxide, it is a commercial chemical, and it should be heat-treated at 750--850°C for more than 2 hours in advance.

[0032] 6. According to 21%~39% sodium fluoride, 41%~53% metal oxide, 8%~38% silicon powder, the above is mole percentage, mix sodium fluoride, metal oxide, and silicon powder, and grind evenly Made of defluorinating agent....

example 1

[0035] will contain CF 4 The industrial waste gas is introduced into the reaction furnace, the defluorination agent is added into the reaction furnace, the reaction temperature is 850°C, and the gas space flow rate is 3.0 liters / hour / gram.

example 2

[0037] will contain CF 4 The industrial waste gas is introduced into the reaction furnace, the defluorination agent is added into the reaction furnace, the reaction temperature is 800°C, and the gas space flow rate is 2.0 liters / hour / gram.

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Abstract

The invention relates to a defluorinating agent for water-free cracking reaction of tetrafluoromethane and an application method thereof. The defluorinating agent is composed of 21 to 39 percent sodium fluoride, 41 to 53 percent metal oxides and the rest of silicon powder. The metal oxides which are provided by the invention are aluminum oxide, lanthanum oxide, cerium dioxide, calcium oxide or magnesium oxide. The invention further provides the application method of the defluorinating agent. The defluorinating agent which is prepared by the invention is prominently characterized by cheap prices of the raw materials and simple preparation process. The defluorinating agent is used for the tetrafluoromethane waste gas which is generated during the cracking industrial process, the performance-price ratio is high and the application is wide.

Description

technical field [0001] The invention relates to a defluorinating agent for anhydrous cracking reaction of carbon tetrafluoride and an application method thereof. Background technique [0002] Human-made emissions of greenhouse gases lead to global warming, which has aroused widespread concern. In December 1997, at the third meeting of the parties to the United Nations Framework Convention on Climate Change held in Japan, representatives of 149 countries and regions adopted restrictions on carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, and perfluorinated carbon dioxide. Carbon, sulfur hexafluoride and other six major greenhouse gas emissions "Kyoto Protocol". On February 16, 2005, the protocol came into force. Metal smelting and electronics industry are the main emission sources of perfluorocarbon waste gas, and the main emission is carbon tetrafluoride. If these carbon tetrafluoride waste gases are directly discharged into the atmosphere without treatment, th...

Claims

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Application Information

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IPC IPC(8): A62D3/34A62D101/22
Inventor 徐秀峰潘燕飞范杰牛宪军
Owner 徐秀峰
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