Method for preparing high purity tetrafluoromethane through combination of rectification and adsorption

A high-purity tetrafluoromethane and tetrafluoromethane technology, which is applied in the disproportionation separation/purification of halogenated hydrocarbons, can solve problems such as the inability to produce tetrafluoromethane, and achieve low production costs, stable quality, and good use of cooling and heat Effect

Inactive Publication Date: 2012-04-04
TIANJIN TAIYUAN INDAL GAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]The problem to be solved by the present invention is to overcome the deficiencies of the prior art, which cannot produce high-purity tetrafluoromethane, and the present technology provides a method for preparing high-purity tetrafluoromethane Pure Tetrafluoromethane Process Technology

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  • Method for preparing high purity tetrafluoromethane through combination of rectification and adsorption
  • Method for preparing high purity tetrafluoromethane through combination of rectification and adsorption

Examples

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Effect test

Embodiment 1

[0022] In the fluidized bed of catalyst CrO2F2, crude tetrafluoromethane (300 kg / hour) is continuously supplied by the equipment that generates tetrafluoromethane, and tetrafluoromethane is prepared by gas phase reaction of chlorofluoromethane and hydrogen fluoride, and high-purity tetrafluoromethane is produced through multi-stage reaction. of fluoromethane;

[0023] The first stage of the reaction is made by reacting CF3Cl with HF in a fluidized bed reactor filled with CrO2F2 catalyst at 200°C, or heating CrF3·3H2O at 350°C in the presence of O2; CF 3 The mass ratio of Cl to HF is controlled at 1:2, and the gas space velocity is 10-150h -1 , the reaction temperature is 380°C, the gas generated in the first stage enters the second stage reaction after being washed with water, alkali washed and dried;

[0024] In the second stage of the reaction, HF is introduced again to make CF 3 The mass ratio of Cl and HF is controlled at 1:0.3, and the gas space veloci...

Embodiment 2

[0026] In the catalyst CrO 2 F 2 The fluidized bed is continuously supplied with crude tetrafluoromethane (350 kg / hour) by the equipment that generates tetrafluoromethane, and the gas phase reaction of chlorofluoromethane and hydrogen fluoride is used to prepare tetrafluoromethane, and high-purity tetrafluoromethane is produced through multi-stage reaction ;

[0027] Among them, the first stage of the reaction is filled with CrO 2 F 2 Catalyst in a fluidized bed reactor to make CF 3 Cl reacts with HF at 600°C, or CrF 3 ·3H 2 O in O 2 Prepared by heating at 750°C in the presence of; CF 3 The mass ratio of Cl to HF is controlled at 1:8, and the gas space velocity is 10-150h -1 , the reaction temperature is 420°C, the gas generated in the first stage enters the second stage reaction after being washed with water, alkali washed and dried;

[0028] In the second stage of the reaction, HF is introduced again to make CF 3 The m...

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Abstract

The invention discloses a method for preparing high purity tetrafluoromethane through combination of rectification and adsorption. The method is mainly characterized in that: equipment for generating tetrafluoromethane continuously supplies the tetrafluoromethane, and fluorochloromethane and potassium bifluoride are subjected to gas-phase reaction to form the tetrafluoromethane. In the method for preparing the high purity tetrafluoromethane, a raw material preparation system, a tetrafluoromethane gas preparation system and a liquefying and gasifying system for the tetrafluoromethane purified through combination of rectification and adsorption. The method has the advantages that: the product has high yield and high purity (99.0-99.9 percent), has a few impurities which are easy to separate; and besides the product, other harmful and toxic byproducts are absent, the operation is convenient, and the method is an ideal technology for preparing the high purity tetrafluoromethane.

Description

technical field [0001] The invention relates to an alkane chemical product, in particular to a process technology for preparing high-purity tetrafluoromethane by means of combined rectification and adsorption, which is suitable for chemical synthesis of tetrafluoromethane. Background technique [0002] Carbon tetrafluoride is a colorless, odorless, high-pressure liquefied gas that does not burn. Carbon tetrafluoride is currently the most used plasma etching gas in the microelectronics industry. It is used for cleaning the surface of electronic devices, the production of solar cells, laser technology, gas phase insulation, low temperature refrigeration, leak detection agents, controlling the attitude of space rockets, and production of printed circuits. Detergents and other aspects are also used in large quantities. Due to its chemical stability, carbon tetrafluoride can be used in metal smelting, such as: copper, stainless steel, carbon steel, aluminum, Monel, etc.; it can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/38
Inventor 原东风
Owner TIANJIN TAIYUAN INDAL GAS
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