| 摘要 |
The invention relates to a method comprising separating a feed stream (16) into a first fraction (41 A) and a second fraction (41 B). The method comprises feeding the first cooled feed fraction (42) into a first disengager (22) in order to produce a light head stream (44). The method comprises expanding a turbine feed fraction (48) resulting from the light head stream (44) in a first turbine (26) up to a first pressure, and feeding the first expanded fraction (54) into a distillation column (30). The method comprises expanding the second fraction of the feed stream (41 B) in a second turbine (40) up to a second pressure substantially equal to the first pressure. The second expanded fraction (91A) from the second dynamic expansion turbine (40) is used to form a cooled reflux stream (91 B) to be fed into the column (30). |
