Sorption fractionation process for olefin separation

Details Sorption fractionation process for olefin separation Sorption fractionation process for olefin separation

C - Chemistry, Metallurgy

07

C

260/719.7

C07C 7/11 (2006.01) C07C 11/04 (2006.01)

Patent

CA 1221709

SORPTION FRACTIONATION PROCESS FOR OLEFIN SEPARATION ABSTRACT: A continuous fractionation process for recovering ethylene from a volatile olefinic feedstock comprising C3+ higher olefins comprises contacting the olefinic feedstock in a counter current sorption tower with a liquid sorbent stream comprising C6+ gasoline range hydrocarbons to selectively sorb substantially the entire C3+ olefin components from the feedstock, withdrawing an ethylene-rich gas stream from the sorption tower and further contacting the ethylene-rich stream with a distillate range liquid hydrocarbon stream in a sponge absorber to purify the ethylene stream. The olefinic feedstock preferably comprises about 10 to 50 mole % ethylene and 10 to 50 mole % propene. Purified ethylene product may be recovered having an average molecular weight not greater than 28.5 under non-cryogenic conditions.

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