Increasing ethylene and/or propylene production in an oxygenate to olefins reaction systems
AssigneeExxonMobil Chemical Patents Inc.
InventorsTeng Xu, Stephen Vaughn
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Abstract
This invention is directed to a process for converting oxygenate to olefin product at an increased prime olefin selectivity (i.e., increased ethylene and/or propylene content) compared to conventional systems. The increase in ethylene and/or propylene content of the produced olefin product is accomplished using a reaction system that has at least two stages. Any number of stages can used in the entire process, as long as there are at least two stages in series and the temperature of any subsequent stage in series is lower than that of the preceding stage.
Claims24
A process for converting oxygenate to olefin, comprising:
- a) contacting the oxygenate with molecular sieve catalyst to form olefin in at least a two stage reactor system in series;
- and
- b) cooling between stages, thereby increasing ethylene and/or propylene content of the olefin.
A process for converting oxygenate to olefin in a reactor system having at least two reaction stages in series, comprising contacting the oxygenate with molecular sieve catalyst to form the olefin while cooling between at least two of the reaction stages.
Dependencies are inferred from the claim text.