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US 7,803,978 B2Granted
Process and apparatus for oligomerization in multiple stages with single fractionation column
AssigneeUop LLC
InventorsBipin V. Vora, Charles P. Luebke, Jill M. Meister, Michael A. Schultz, Dale J. Shields
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Abstract
In an oligomerization process comprising at least two oligomerization reactors, at least portions of product streams from two reactors are separated in the same separator vessel. In an embodiment, a liquid product stream from the first oligomerization reactor is fed to a fractionation column and a side cut from the fractionation column feeds the second oligomerization reactor.
Claims16
A process for oligomerizing light olefins to produce heavy olefins comprising:
- feeding a first reactant stream of light olefins and from about 1 to about 4 weight percent oxygenate modifier to a first reactor containing a solid oligomerization catalyst;
- catalytically oligomerizing said light olefins to product oligomers in said first reactor;
- passing a first product stream from said first reactor to a flash vessel to roughly separate a vapor phase from a liquid phase;
- passing said liquid phase of said first product stream to a fractionation column to separate light olefins from product oligomers;
- collecting an overhead stream of alkanes and light olefins from said fractionation column;
- passing a second reactant stream of light olefins and oxygenate modifier taken as a sidecut from said fractionation column to a second reactor containing a solid oligomerization catalyst;
- catalytically oligomerizing said light olefins to product oligomers in said second reactor;
- and
- passing at least a portion of a second product stream from said second reactor to said fractionation column to separate light olefins from said product oligomers.
6 more elements
A process for oligomerizing light olefins to produce product oligomers comprising:
- feeding a first reactant stream of light olefins to a first reactor containing a solid oligomerization catalyst;
- catalytically oligomerizing said light olefins to product oligomers in said first reactor;
- passing at least a portion of a first product stream from said first reactor to a flash vessel to roughly separate a vapor phase from a liquid phase of said first product stream
- passing said liquid phase to a fractionation column to separate light olefins from product oligomers;
- taking a side cut from said fractionation column;
- passing said side cut as a second reactant stream of light olefins to a second reactor containing a solid oligomerization catalyst;
- and
- catalytically oligomerizing said light olefins to product oligomers in said second reactor.
5 more elements
Dependencies are inferred from the claim text.