PROPYLENE GAS FREEZE DRYING PROCESS

The present invention provides a propylene gas freeze drying process, which comprises the following steps: after propylene gas is fed into a propylene evaporator to undergo heat exchange with a liquid refrigerant and be cooled, a gas-liquid mixture at the upper part enters a steam-water separator, and condensate water at the lower part flows into a water storage tank through a gas blocking drainer; the gas-liquid mixture entering the steam-water separator is subjected to speed reduction, collision and condensation to form condensate water, the condensate water is separated from the propylene gas and flows into the water storage tank from the steam-water separator, and the propylene gas enters a tube type heat exchanger; in the tube type heat exchanger, the propylene gas exchanges heat with liquid propylene from a production equipment area to be cooled and then is fed into a propylene compressor inlet of the production equipment area; the liquid propylene is vaporized in the tube type heat exchanger and then r