US 9,309,168 B2Granted

Staged propylene production process

AssigneesEquistar Chemicals, LP, Lyondell Chemical Technology, L.P.

InventorsAllen David Hood, Jr., Robert S. Bridges

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Abstract

Processes for forming propylene are described herein. The processes generally include reacting a metathesis feed stream including butene with ethylene in the presence of a first metathesis catalyst via a first metathesis reaction to form a first metathesis product stream including propylene, ethylene, butene, and C5+ olefins; separating at least a portion of the propylene and ethylene from the first metathesis product stream to form a first overhead stream and to form a first de-propenized bottoms stream including butene and C5+ olefins; reacting at least a portion of the first de-propenized bottoms stream with ethylene in the presence of a second metathesis catalyst via a second metathesis reaction to form a second metathesis product stream including propylene, ethylene, butene, and C5+ olefins; and separating at least a portion of the propylene and ethylene from the second metathesis product stream to form a second overhead stream; and recovering propylene from the first overhead stream, the second overhead stream or combinations thereof.

Claims14

Dependent claims

A process for forming propylene comprising:

reacting a metathesis feed stream comprising butene with ethylene in the presence of a first metathesis catalyst via a first metathesis reaction to form a first metathesis product stream comprising propylene, ethylene, butene, and C5+ olefins, wherein the first metathesis reaction takes place at an first ethylene to butene molar ratio of 2.0;
separating at least a portion of the propylene and ethylene from the first metathesis product stream to form a first overhead stream and to form a first de-propenized bottoms stream comprising butene and C5+ olefins;
reacting at least a portion of the first de-propenized bottoms stream with ethylene in the presence of a second metathesis catalyst via a second metathesis reaction to form a second metathesis product stream comprising propylene, ethylene, butene, and C5+ olefins, wherein the second metathesis reaction takes place at an second ethylene to butene molar ratio of 6.6;
and
separating at least a portion of the propylene and ethylene from the second metathesis product stream to form a second overhead stream;
and
recovering propylene from the first overhead stream, the second overhead stream or combinations thereof.

4 more elements

Dependencies are inferred from the claim text.