In the process of polyethylene production, many unreacted monomers, such as ethylene, ethane, isopentane and nitrogen, will be discharged from the reactor. This technology uses the principle of expansion refrigeration and the pressure energy of tail gas itself to gradually reduce the gas to low temperature, Most of the olefin components are liquefied and then separated by gas and liquid. The product olefin is rewarming and then returned to the reactor for recycling. After separation, the olefin content in the tail gas is very low (鈮?2%), so it can be returned to the degassing bin for recycling, so as to achieve the purpose of energy saving and environmental protection.China Polyolefin Tail Gas Recovery Plant website:http://www.cryoseparation.com/chemical-off-gas-recovery-plant/polyolefin-tail-gas-recovery-plant/