NOVELTY - Pre-deethanizing ethylene driving process is carried out by passing ethylene raw material through ethylene cracking furnace (H1), cracked gas compressor (K1), pre-deethanizing device, cold box (B1), and demethanizing nitrogen pre-cooling device, returning overhead nitrogen to cold box methane hydrogen separation tank (VI) and demethanizer column (C3) cracked gas compressor suction port, fastening cold box and cold demethanizer column, purging natural gas and ethane, recycling gas in cracked gas compressor to pre-cold box, and purging cold box.    USE - Pre-deethanizing ethylene driving process for ethylene oxide removal.    ADVANTAGE - Process is environment-friendly, shorts start-up time, reduces hydrocarbon emission, and reduces cost of ethylene production plant operation.    DETAILED DESCRIPTION - Pre-deethanizing ethylene driving process is carried out by passing ethylene raw material through ethylene cracking furnace, cracked gas compressor, pre-deethanizing device, cold box, and demethanizing nitrogen pre-cooling device, returning overhead nitrogen to cold box methane hydrogen separation tank and demethanizer column cracked gas compressor suction port, fastening cold box and cold demethanizer column, purging natural gas and ethane with nitrogen, recycling gas in cracked gas compressor to pre-cold box, and purging cold box and demethanizer column overhead flare emissions with nitrogen, and recycling gas to displace gas in fuel gas system which involves circulating gas in cracked gas compressor, circulating nitrogen gas in cold box methane hydrogen separation tank and demethanizer column cracked gas compressor suction port, recovering ethylene oxide from distillation column bottoms in temporary ethane tank (F3), cooling to recover ethane, and recovering demethanizer bottoms from demethanizer column, cracked gas compressor suction port, cracking furnace, and connecting pipes and heat facilities.    DESCRIPTION OF DRAWING(S) - The drawing shows a cycle diagram of pre-deethanizing ethylene driving process.    Cold box (B1)    Demethanizer column (C3)    Temporary ethane tank (F3)    Ethylene cracking furnace (H1)    Cracked gas compressor (K1)    Cold box methane hydrogen separation tank (VI)