Abstract: The vent gas from propane refrigeration system of light ends recovery unit was designed to be burned via the flare system, resulting in serious waste of resources and environmental pollution. The causes of the venting of the vent gas from propane refrigeration system are analyzed, and a process scheme for separately recycling the gas-phase propane and liquid-phase propane from the vent gas is proposed, so as to successfully achieve the recovery of vent gas from propane refrigeration system, save resources and reduce environmental pollution

Key words: Propane refrigeration system, Vent gas, Recovery