Research On Separation And Technology Optimization Of HFP And HFPO

Both Hexafluoropropylene oxide (hereinafter referring to as HFPO) and hexafluoropropylene (hereinafter referring to as HFP) are important intermediate for synthesizing organic fluoric materials.HFPO can be obtained by an epoxidation of HFP in various methods.However, The preparation of HFPO in a pure state by distillation from mixtures with HFP is not easy to carry out technically, since the physical of the two components determining the separation are very similar for the boiling points are close to one another(HFP -29.4℃, HFPO-27.4℃).1. In this paper, various methods of separating of HFPO from HFP were reviewed. A process for a separation of HFPO from HFP by an extractive distillation in the presence of a normally liquid inert compound is proposed.2. Gas-liquid equilibrium data of HFPO and HFP at different conditions are measured by means of gas-liquid equilibrium apparatus. The suitable solvent was gotFirstly, the author designed the equipment for determining data of vapor-liquid equilibrium. Then the dependability of the equipment had been tested through vapor-liquid equilibrium of the ethanol and benzene system.Secondly, the column and operating parameters of gas chromatography for analyzing HFPO and HFP had been determined through many tests.Thirdly, Gas-liquid equilibrium data of HFPO and HFP at different conditions are measured by means of gas-liquid equilibrium apparatus. Several solvents have been tested through the forementioned vapor-liquid equilibrium equipment for their extractive capability, and we get the suitable solvent The solvent Methylene chloride is the bestFinally, several solvents have been tested through the forementioned vapor-liquid equilibrium equipment for their extractive capability. The solvent methylene chloride is the best, and gas-liquid equilibrium data of HFPO and HFP at different conditions are measured in the presence of methylene chloride.3.The large steady state simulation tool—ASPEN PLUS is used to model the process. The simulation under difierent conditions , the position of feed stage, the ratio of extract solvent to feed, the reflux ratio, etc., was made for optimizing the operation parameters. some guidance for actual operation is provided.