A method for preparing high-purity octafluoropropane

Abstract

The invention relates to a method for preparing high-purity octafluoropropane, comprising the steps of: setting the reaction temperature to 50-250°C in a reactor, using cobalt trifluoride as a catalyst, hexafluoropropylene and fluorine as reaction gases, The reaction prepares octafluoropropane; the molar ratio of the hexafluoropropylene to the fluorine gas is 1:2-6. In this preparation method, cobalt trifluoride is used as a catalyst to realize continuous reaction, which promotes the addition reaction of hexafluoropropylene and fluorine gas, the conversion rate of hexafluoropropylene is almost 100%, and the yield of octafluoropropane can reach More than 90%, the selectivity of the reaction is good, and the content of by-products is small. The obtained crude product can prepare high-purity octafluoropropane after subsequent purification treatment, which is a low-cost, high-efficiency octafluoropropane production method that can realize 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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