Absorption process for ethylene and hydrogen recovery

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 11/04 (2006.01) C07C 7/11 (2006.01) C10G 5/04 (2006.01) C10G 70/04 (2006.01) C10G 70/06 (2006.01) F25J 3/08 (2006.01)

Patent

CA 2130567

2130567 9317081 PCTABS00025 Contacting an olefins-containing feed gas stream in a front-end heat-pumped deethanizer or depropanizer to remove the C3+ or C4+ compounds, selectively hydrogenating the overhead stream to significantly reduce the acetylene and diolefins content, dehydrating the reactor effluent to remove traces of moisture, feeding the dehydrated stream to an intercooled and reboiled demethanizing absorber to produce a rich solvent containing ethylene and heavier hydrocarbons, separating the rich solvent in a solvent regenerator into an overhead stream of ethylene and heavier hydrocarbons and a bottom lean solvent stream for recycle to the demethanizing absorber, feeding the absorber overhead stream to an autorefrigerated recovery unit to additionally recover a demethanized C2+ stream, recover excess solvent and produce a fuel gas stream, combining the overhead of the solvent regenerator with the C2+ stream and feeding the combined stream to a deethanizer which produces an overhead stream that is split into ethylene as product and ethane for recycling to the cracker.

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