| 摘要 |
PCT No. PCT/EP92/01857 Sec. 371 Date Feb. 18, 1994 Sec. 102(e) Date Feb. 18, 1994 PCT Filed Aug. 13, 1992 PCT Pub. No. WO93/04327 PCT Pub. Date Mar. 4, 1993.A process for separating higher hydrocarbons from a gas mixture containing the latter and lower-boiling components by rectificatory decomposition is described. The feed gas mixture (6) is partially condensed (7) and fed to a separation column (9). A bottom fraction (27), rich in higher hydrocarbons, is removed from the bottom of the separation column (9), and a top fraction (10), rich in lower-boiling components, is removed from the top of the separation column. The top fraction (10) is partially condensed (11) and the resultant condensate is used as reflux for the separation column (9). Both the partial condensation of the feed gas mixture and the partial condensation of the top fraction are produced by indirect heat exchange (7, 11) with a refrigerant, which consists of several components and is conveyed in an external circuit (18). |
