Upgrading streams comprising c3 and c4 hydrocarbons
AssigneeKellogg Brown & Root LLC
InventorsDavid Sellinger, Robert Choi, Quo-Chen Yeh, Alok Srivastava, Kristine E. Hamilton, Michael A. Radzicki
Life of this patent
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Abstract
A first stream containing 1,3-butadiene, C4 acetylenes, and optionally C3 hydrocarbons, is mixed with a portion of the liquid recycle stream from a C4 acetylene hydrogenation reactor containing hydrogenated C4 acetylenes and a molecular hydrogen-containing stream, the resulting mixed stream is then fed to a C4 acetylene hydrogenation reactor to selectively hydrogenate the C4 acetylenes in the crude butadiene stream without appreciable 1,3-butadiene conversion.
Claims11
A selective hydrogenation system comprising:
- a debutanizer overhead reflux drum containing crude butadiene;
- a pump in fluid communication with crude butadiene in a first stream from the debutanizer overhead reflux drum through a heat exchanger to a hydrogenation reactor;
- a molecular hydrogen-containing stream in fluid communication with the first stream;
- an effluent line from the hydrogenation reactor directing an effluent stream through the heat exchanger to a recycle drum;
- a recycle line in communication with the first stream;
- and
- a hydrogenated product stream in fluid communication with the recycle line.
An ethylene plant comprising:
- a gas cracker comprising a crude product effluent;
- a debutanizer in fluid communication with the crude product effluent, the debutanizer comprising a debutanizer overhead reflux drum containing mixed C3s and C4s with the C4s including undesireable C4 acetylenes and desireable butadiene;
- a pump in fluid communication with crude butadiene in a first stream from the debutanizer overhead reflux drum through a heat exchanger to a hydrogenation reactor;
- a molecular hydrogen-containing stream in fluid communication with the first stream;
- an effluent line from the hydrogenation reactor directing an effluent stream through the heat exchanger to a recycle drum;
- a recycle line in communication with the first stream;
- and
- a hydrogenated product stream in fluid communication with the recycle line.
An upgraded hydroprocessed product produced by the selective hydrogenation process comprising:
- from about 0.5 to about 1.0 wt % hydrogenated C4 acetylenes;
- and
- from about 8 to about 37 wt % hydrogenated 1,3-butadiene.
Dependencies are inferred from the claim text.