Patent ID: 6308532
Filing Date: 2001-10-30
Classification: C07C,C10G,F25J,Y02P

Abstract:
A process for the recovery of an olefin from a gas feed stream comprising hydrocarbons and minor amounts of olefins, which process comprises:a) introducing the gas feed stream into a single recovery distillation column having an upper tray section and with an overhead condenser and reflux drum;b) withdrawing an overhead vapor stream from said column;c) cooling and partially condensing the overhead vapor stream in the overhead condenser, to provide an overhead vapor-liquid;d) phase-separating the overhead vapor-liquid in the reflux drum;e) withdrawing from the reflux drum, an olefin-lean, overhead vapor stream and recycling the separated liquid from the reflux drum to the column;f) withdrawing from said column, a liquid C.sub.3 +, C.sub.4 +, C.sub.5 +, or C.sub.6 + bottoms product stream;g) recycling at least a portion of the liquid bottoms product stream to the overhead condenser or the upper tray section of said column, to maintain the temperature of the overhead condenser above about -140.degree. F. refrigeration temperature; andh) withdrawing an olefin-rich, vapor phase, side product stream rich in a selected olefin.