| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of ethylene capable of much saving cooling energy concerning to a cryogenic separation step, refrigerant and the like and reducing load on equipment. SOLUTION: This method is production of ethylene from a gaseous hydrocarbon including hydrogen, methane, ethane and ethylene and comprises (I) a separating step wherein a gaseous hydrocarbon is fed to a membrane separation device having hydrocarbon permselective membrane to separate a hydrocarbon gas including almost all ethylene (A) and a hydrocarbon gas substantially including no ethylene (B) and (II) a cryogenic separation step for the hydrocarbon gas including almost all ethylene (A). The load of a prefractionator T-1 for demethanization and a demethanizer T-2 can be decrerased. And, if an established cryogenic separation or a deethanizer followed by a demethanizer or the like is used, the throughput can be much increased. |
