Ethylene separation process
AssigneesEquistar Chemicals, LP, Lyondell Chemical Technology, L.P.
InventorsGary A. Sawyer, Robert S. Bridges, Steven T. Coleman, Allen David Hood, JR.
Life of this patent
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Abstract
Ethylene separation processes are described herein. The ethylene separation processes generally include introducing a feed stream including ethylene and butene into a de-ethenizer; and separating the ethylene from the butene via fractional distillation within the de-ethenizer to form an overhead stream including separated ethylene and a bottoms stream including separated butene, wherein the de-ethenizer operates at a pressure of less than 350 psig.
Claims20
An ethylene separation process comprising:
- introducing a feed stream comprising ethylene and butene into a de-ethenizer;
- and
- separating the ethylene from the butene via fractional distillation within the de-ethenizer to form an overhead stream comprising separated ethylene and a bottoms stream comprising separated butene, wherein the de-ethenizer operates at a pressure of less than 350 psig.
A process for producing propylene comprising:
- reacting a metathesis feed stream comprising butene with ethylene in the presence of a metathesis catalyst via a metathesis reaction to form a metathesis product stream comprising propylene, ethylene and butene;
- separating the ethylene from the propylene via fractional distillation within a de-etherizer to form an overhead stream comprising separated ethylene and a bottoms stream comprising separated butene and propylene;
- and
- recycling the overhead stream from the de-ethenizer to the metathesis reaction in the form of vapor.
Dependencies are inferred from the claim text.