| 摘要 |
In the separation in a rectification column of methane and optionally lower-boiling components from a methane-containing crude gas, which gas contains additionally higher-boiling hydrocarbons, hydrogen sulfide, carbon dioxide, or mixtures thereof, wherein an auxiliary cycle containing a fluid medium is employed for the production of cooling to produce reflux liquid at the head of the rectifying column, an improvement is provided wherein liquid in the rectifying column positioned above the column sump and below the column head, is vaporized in indirect heat exchange with condensing cycle medium. |
