Method for directly preparing tetrafluoromethane from fluorocarbon using explosion suppressant

A technology of tetrafluoromethane and detonation inhibitor, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of high cost, high generation risk, difficulty in tetrafluoromethane, etc., and achieves low production cost. , stable quality, good use of cold and heat

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

The prior art uses the direct reaction of fluorine gas and carbon to generate tetrafluoromethane, the reaction is unstable, the possibility of explosion is likely to occur, and the risk of formation is high
The original technology is to prepare tetrafluoromethane by gas phase reaction between chlorofluoromethane and hydrogen fluoride (HF). Since the fluorination of chlorofluoromethane is more difficult than that of corresponding methane, it is very difficult to obtain tetrafluoromethane and the cost is also very high.

Method used

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  • Method for directly preparing tetrafluoromethane from fluorocarbon using explosion suppressant
  • Method for directly preparing tetrafluoromethane from fluorocarbon using explosion suppressant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Under the condition of integrated continuous feeding, in BrF 3 Under the condition of making explosion suppressant, use 60 mesh petroleum coke and F 2 The process of preparing high-purity tetrafluoromethane by reaction; wherein the volume ratio of antiknock agent to fluorine gas is 1:20; the amount of petroleum coke added is 500 kg / time, F 2 The amount added is 10 liters / minute;

[0027] (2) The fluorinated halogen is drawn out from the receiver 2 by the pump 4 and sent to the top of the reactor 1, carbon particles are added from the top of the reactor, and pure F is introduced from the other side of the top 2 ; Keep the system reacting at 127°C, at this time BrF 3 start to vaporize;

[0028] (3) The generated mixed gas and BrF3 liquid flow downward, and after being cooled to 30°C by the condenser 3, the liquid BrF3 3 Enter the loop in the receiver;

[0029] (4) Crude tetrafluoromethane gas is derived from the receiver above, and...

Embodiment 2

[0031] (1) Under the condition of integrated continuous feeding, use bromine trifluoride as explosion suppressant, use 60 mesh petroleum coke and F 2 reaction to prepare high-purity tetrafluoromethane; wherein the volume ratio of antiknock agent to fluorine gas is 1:20; petroleum coke addition is 550 kg / time, F 2 The amount added is 12 liters / minute;

[0032] (2) The fluorinated halogen is drawn out from the receiver 2 by the pump 4 and sent to the top of the reactor 1, carbon particles are added from the top of the reactor, and pure F is introduced from the other side of the top 2 ; Keep the system reacting at 127°C, at this time BrF 3 start to vaporize;

[0033] (3) The generated mixed gas and BrF3 liquid flow downward, and after being cooled to 30°C by the condenser 3, the liquid BrF3 3 Enter the loop in the receiver;

[0034] (4) Crude tetrafluoromethane gas is derived from the receiver above, and the entrained fluorinated halogen is recover...

Embodiment 3

[0036] (1) Under the condition of integrated continuous feeding, use bromine trifluoride as explosion suppressant, use 60 mesh petroleum coke and F 2 reaction to prepare high-purity tetrafluoromethane; wherein the volume ratio of antiknock agent to fluorine gas is 1:12; the amount of petroleum coke added is 500 kg / time, F 2 The amount added is 11 liters / minute;

[0037] (2) The fluorinated halogen is drawn out from the receiver 2 by the pump 4 and sent to the top of the reactor 1, carbon particles are added from the top of the reactor, and pure F is introduced from the other side of the top 2 ; Keep the system reacting at 127°C, at this time BrF 3 start to vaporize;

[0038] (3) The resulting mixed gas and BrF 3 The liquid flows downward, and after being cooled to 30°C by the condenser 3, the liquid BrF 3 Enter the loop in the receiver;

[0039] (4) Crude tetrafluoromethane gas is derived from the receiver above, and the entrained fluorinat...

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Abstract

The invention discloses a method for directly preparing tetrafluoromethane by a fluorocarbon direct synthesis process using bromine trifluoride as an explosion suppressant, is a process for preparing high-purity tetrafluoromethane by the reaction of 60-mesh petroleum coke and F2 under a condition that fluorinated halogen is used as an explosion suppressant, wherein the ratio of the added amount of the explosion suppressant to the volume of fluoride is 1: 20; the added amount of the petroleum coke is 500-550 kg every time, and the added amount of the F2 is 10-12 L / min; and the high-purity tetrafluoromethane is obtained at last after port-treatment. The preparation method disclosed by the invention is reasonable in process and simple in production, as well as is the most simple and ideal technology for preparing tetrafluoromethane.

Description

technical field [0001] The invention relates to a chemical product, in particular to a method for preparing tetrafluoromethane through direct synthesis of fluorocarbons using bromine trifluoride as an explosion suppressant, which is suitable for large-scale industrial production of tetrafluoromethane. Background technique [0002] Tetrafluoromethane 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, alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/007
Inventor 李中元
Owner TIANJIN TAIHENG GASES
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