Method for preparing trifluoromethane

Abstract

The invention provides a method for preparing trifluoromethane, and relates to the field of organic synthesis. The method particularly comprises the following steps: leading mixed feed gas including chloroform and hydrogen fluoride into a tube-type fixed bed reactor filled with catalyst for reaction; and separating to obtain trifluoromethane through rectification. The carrier of the catalyst is nickel oxide, aluminum sesquioxide, zinc oxide or activated charcoal; and the active constituent during catalysis is a mixture of chromic salt and La3F3. The method has the advantages that the process and the equipment are simple; the conversion rate is high; the reaction conditions are mild; the service life of catalyst is long; and the equipment requirement is low.

Description

Technical field [0001] The present invention involves the field of organic synthesis and specifically involves a method for preparing triarum methane. Background technique [0002] Tysin fluoride (HFC23) is a colorless, almost odorless, non -conductive gas, and its density is about 2.4 times the air density.Triperfluoro methane fire extinguishing agent is liquid storage, the gaseous release, and the pressure of trifluoro methane vapor is high. You can spray it yourself without the need for nitrogen pressure. The temperature range of the trichlotine fire extinguishing system is widely used, and the ambient temperature is -20 ° C to 50 ° C. It can be used in the cold areas in northern my country, which can play its superiority. [0003] Totor methane fire extinguishing agent is a chemical fire extinguishing agent.The trifluoro methane gas extinguishing system can be used to extinguish solid surface fires, flammable liquid fires, combustible gas fires and electrical fires. It is sui...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, due to reasons such as short catalyst life and high reaction temperature, the current method of using chloroform to catalyze fluorination to produce trifluoromethane is not suitable for industrial production

Other methods, such as: Freon 22 catalytic disproportionation method, difluorochloromethane catalytic fluorination method, due to the high price of raw materials, the cost of trifluoromethane products is relatively high, which is not conducive to the popularization and promotion of trifluoromethane

Dichloromethane catalyzed fluorination method, due to the use of liquid phase reaction, and the catalyst is more expensive, so the cost of trifluoromethane is high, which is not conducive to the popularization of trifluoromethane

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