Method for preparing high-purity perfluoropropane

Abstract

The invention relates to a method for preparing high-purity perfluoropropane. The method comprises the following steps: in a reactor, the reaction temperature is set to 50-250 DEG C, cobaltic fluoride is taken as a catalyst, hexafluoropropene and fluorine gas are taken as reaction gas, perfluoropropane is prepared after the reaction, and the mole ratio of hexafluoropropene to fluorine gas is 1:2-6. In the method, cobaltic fluoride is taken as the catalyst, continuous reaction is realized, an addition reaction of hexafluoropropene and fluorine gas is promoted, conversion rate of hexafluoropropene is almost 100%, and perfluoropropane yield can reach 90% and above, the reaction selectivity is good, and the by-product content is little. The high-purity perfluoropropane is prepared after subsequent purifying processing of the crude product, and the method has the advantages of low cost, high efficiency and industrial production.

Description

technical field [0001] The invention relates to a preparation method of octafluoropropane, in particular to a method for preparing high-purity octafluoropropane by direct reaction of hexafluoropropylene and fluorine gas under the action of a cobalt-based catalyst. Background technique [0002] Due to its good chemical stability and thermal stability, octafluoropropane is a widely used fluorocarbon gas, which is often used as etching gas, cleaning gas or dielectric gas in the semiconductor industry; and because of its high physiological Drug resistance, it is mainly used as filler after vitreoretinal surgery and ultrasound contrast agent in clinical medicine; in addition, it is also used as one of the components of refrigerant mixture in other industries. At present, new uses of octafluoropropane are still being developed at home and abroad. [0003] In the prior art, there are mainly the following five methods for preparing octafluoropropane. [0004] The first is the dire...

AI Technical Summary

Problems solved by technology

This process is not a continuous preparation process, and the process is cumbersome; at the same time, due to the continuous cycle conversion between cobalt trifluoride and cobalt difluoride in the production process, the internal molecular structure of the fluorinating agent is constantly changing, making the fluorine in the reactor The pulverization of the chemical agent bed affects the continuity of the process, which greatly increases the raw material cost and maintenance cost of production

In addition, the effective utilization rate of cobalt trifluoride as a fluorinating agent is only 16.3%, which is not conducive to large-scale production

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