| 摘要 |
1321153 Cold separation of gas mixtures TEXACO DEVELOPMENT CORP 29 June 1971 30354/71 Heading F4P Separation of C 4 hydrocarbons from admixture with hydrogen and methane is effected by passing a compressed feed stream 13 downwardly through the shell space of one or other of two switchable heat exchangers 19, 21 according to the setting of valves 14, 16 thereby condensing the C 4 h.c. on trays 23 of the on stream exchanger, e.g. 19, withdrawing at 28 the so-purified gas stream, work-expanding it at 39, passing the so-cooled gas upwardly through a coil 29 thereby providing cold for exchanger 19, withdrawing the major portion of the so-warmed expanded purified gas stream at 31, recompressing it at 51 and passing that portion not discharged as product hydrogen at 60 through a line 62 and, downwardly through coil 29<SP>1</SP> of the on-purge exchanger 21 and from thence to the inlet of expander 39, withdrawing at 32 a minor portion of expanded purified gas from coil 29, further work expanding it at 72 and passing it upwardly through the tray space 22<SP>1</SP> of exchanger 21 thereby purging the latter of condensate generated during the previous cycle. The exchangers 19, 21 are switched by rever- sal of valves 14 16, 34, 40, 44, 49, 67 and 74 from the positions shown. |
