Method for recovering propylene in preparation process of chloropropene

The invention relates to a method for recovering propylene in a preparation process of chloropropene. Chloride is generated in a chlorination reaction; propylene and hydrogen chloride mixed gas is obtained at the top of a condensation and evaporation tower in a chlorination reaction process; hydrogen chloride is removed; propylene is sent to a propylene compressor for first-stage compression, subjected to oil removal through an oil separator in the compressor, cooling and water separation through a cooler, second-stage compression, oil removal through the oil separator in the compressor and cooling and water separation in the cooler and condensed into liquid propylene by secondary circulating water; then the liquid propylene is sent to a circulating propylene tank, enters a subcooler after water separation, is subjected to freezing and water separation through propylene in a dry propylene tank and enters a molecular sieve drying system; the dried propylene enters the dry propylene tank. Propylene treated with the recover method can be taken as a raw material to be directly used for production of chloropropene, resources are saved, and the utilization rate of propylene is increased.