| 摘要 |
<p>The gas to be treated is cooled and partially condensed in two steps (3-4, 5-6) and the condensed fractions are distilled in a column (9). A portion of the condensed liquid in the column head is under cooled in the second exchanger (5), relieved and vaporized in countercurrent of the gas to be treated. Thereby it is possible to obtain cooling temperatures of the order of -80oC by means of a refrigerating unit (13, 20) operating at a temperature comprised between -30 and -40oC approximately. Application to the recovery of a mixture of propane, butane and pentane from a residual gas of an oil refinery.</p> |
