| 摘要 |
1509789 Separating gases AIR PRODUCTS & CHEMICALS Inc 17 Oct 1975 [27 Nov 1974] 42731/75 Heading F4P In a method of separating the C 2 hydrocarbons from a mixture comprising hydrogen, methane, ethane and ethylene, the feed gas is partially condensed in dephlegmator 27 cooled by indirect heat exchange, the condensate being fed to a rectification column 16 from the base of which a liquid product stream of C 2 hydrocarbons is withdrawn. The compressed feed gas is precooled at 11 and partly condensed at 13, the gaseous fraction being fed to dephlegmator 27, and as some of this condenses it flows back down to separator 13. The gas mixture leaving 27 is cooled at 30 and fed to separator 32, the overhead from which is withdrawn. The liquid stream from separator 32 is expanded at 35, warmed at 30, and used to cool dephlegmator 27 before being work-expanded at 40, warmed at 25 and recompressed at 43. Gaseous overheads from column 16 are partially condensed, the liquid being recycled, the gas being cooled at 25 and expanded at 58 and added to the stream from heat exchanger 30. In a modification, Fig. 2 (not shown), the liquid stream from separator 32 is warmed and fed to column 16, and some of the condensed gas overheads from column 16 are cooled, expanded and warmed then added to the stream cooling dephlegmator 27. The latter is additionally cooled by evaporating ethylene in coils 28. |
