Device for refrigerating, separating and purifying formyl fluoride by using mixed refrigerant

The utility model discloses a device for refrigerating, separating and purifying formyl fluoride by using a mixed refrigerant, and solves the technical problem that no device for systematically and conveniently purifying formyl fluoride gas exists in the prior art. The device comprises a main heat exchanger (1), a tetrafluoromethane removal tower (2), a tetrafluoromethane removal tower reboiler (3), a tetrafluoromethane removal tower condenser (4), a tetrafluoromethane removal tower return tank (5), a formyl fluoride tower (6), a formyl fluoride tower reboiler (7), a formyl fluoride tower condenser (8), a formyl fluoride tower return tank (9), a refrigerant separator (10) and a mixed refrigerant compressor system (11). The device provided by the utility model separates formyl fluoride gas and byproducts thereof through multi-stage rectification purification and mixed refrigerant circulating refrigeration, and has the advantages of low energy consumption, low investment, simple process, high recovery efficienc