Recycling light olefins in multistage Fischer Tropsch processes

Details Recycling light olefins in multistage Fischer Tropsch processes Recycling light olefins in multistage Fischer Tropsch processes

2005-05-24

2005-05-24

Parsa, J. (Department: 1621)

Chemistry: fischer-tropsch processes; or purification or recover

Treatment of feed or recycle stream

C518S700000, C518S706000, C518S707000, C518S715000

Reexamination Certificate

active

06897246

ABSTRACT:
A process for reducing C2-C9olefin formation by recycling them to a Fischer-Tropsch hydrocarbon synthesis process and promoting recycled olefins chain growth comprises contacting a gas feed comprising a mixture of H2and CO with a catalyst in a reactor system at conditions effective to produce a hydrocarbon product stream including C2-C9olefins, separating a C2-C9olefins-rich stream from the hydrocarbon product stream to form a light olefin recycle stream and recycling the light olefin recycle stream to the reactor system at a point in the reactor system where the H2:CO ratio is low relative to the H2:CO ratio in the rest of the reactor system. Depending on whether the initial H2:CO ratio is greater or less than the usage ratio of the selected catalyst, the recycled olefins can be returned to the system up- or downstream of the reactor system.

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