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US 2011/0282092 A1Published application
Lowering Nitrogen-Containing Lewis Bases In Molecular Sieve Oligomerisation
AssigneeExxonMobil Chemical Patents Inc.
InventorsJohn Stephen Godsmark, George Marie Karel Mathys, Hubertus Joseph Beckers, Charles Morris Yarbrough, Stephen Harold Brown, Yeo-Meng Lim
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Abstract
Nitrogen-containing Lewis bases act as poisons for molecular sieve catalysts used in oligomerisation reactions. Lowering their presence in the feed prior to the contacting thereof with the molecular sieve brings a significant extension of catalyst life. Thus, processes that are directed to the lowering of these poisons are provided.
Claims25
A process for the oligomerisation of olefins comprising:
- (a) treating an olefin-containing hydrocarbon stream comprising an organic nitrogen-containing Lewis base to thereby lower the concentration of the organic nitrogen-containing Lewis base in the olefin-containing hydrocarbon stream;
- and
- (b) subsequently contacting the treated olefin-containing hydrocarbon stream with a molecular sieve oligomerisation catalyst to produce a product comprising at least one oligomer;
- wherein said Lewis base is selected from the group consisting of at least one of acetonitrile, propionitrile, dimethylformamide, N-methyl-pyrrolidone, and mixtures thereof;
- wherein the treating comprises an extraction step of water washing;
- and
- wherein the treated hydrocarbon stream is substantially free of the Lewis base.
4 more elements
Dependencies are inferred from the claim text.