Hexafluoropropyl epoxide continuous production technique

Abstract

The invention relates to a process for continuous production of hexafluoropropylene oxide. The materials are discharged when the reaction of hexafluoropropylene and oxygen is carried out fully, the hexafluoropropylene gas and the oxygen are mixed by proportion and then are introduced into the solvent in a reactor as a gas mixture, the oxygen and the hexafluoropropylene firstly pass through a solvent layer in the reactor and then are carried out the complete reaction in the solvent, the reactant is accumulated in a gas-phase space in the reactor continuously, the mixed gas containing the reactant in the gas phase can be controlled by pressure regulation, so as to discharge the materials to the outside of the reactor continuously, the discharging gas is condensed and reclaimed the containing solvent in the mixed gas by a condenser, the reactant gas after the condensation is sent to a processing system for further treatment and purification, finally the needed hexafluoropropylene oxide final product is obtained. The process flow is simple, the equipments are fewer, the operation is convenient and the equipment utilization ratio is high.

Description

technical field [0001] The invention belongs to the field of preparation of fluorine-containing fine chemicals, and in particular relates to a method for continuously preparing hexafluoropropylene oxide by liquid-phase oxidation of hexafluoropropylene. Background technique [0002] Hexafluoropropylene oxide (HFPO for short), also known as perfluoropropylene oxide, is an important organic fluoride intermediate. Due to its special chemical activity, it can be used to synthesize important fluorine-containing compounds such as perfluorosulfonic acid ion exchange resin, fusible polytetrafluoroethylene, fluoroether oil, fluorosurfactant, fluororubber, etc. It is widely used in various fields such as electronics, nuclear power engineering, and medicine. The compound was first synthesized by DuPont in 1959. In 1962, the company published a patent for the preparation of HFPO from hexafluoropropylene (HFP). Since then, HFPO chemistry has developed rapidly. In recent years, with th...

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Problems solved by technology

The disadvantage of this method is that during the discharge process after the reaction, the reactor cannot be used all the time, the efficiency of the equipment cannot be exerted, and the production capacity is low.

In addition, this method is only suitable for small-scale production. If large-scale and large-scale production is required, the reactor needs to be enlarged or the number of reactors of the same size should be increased. At the same time, each reactor needs to be equipped with the same set of raw materials. The supporting facilities are simple and repetitive, occupying a large area and using a lot of personnel, which is very uneconomical

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