| CPC C10G 69/126 (2013.01) [C10G 2300/10 (2013.01); C10G 2400/20 (2013.01); C10G 2400/22 (2013.01)] | 13 Claims |
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1. A process for producing an olefin stream from a feedstock stream comprising oxygenates, said process comprising the steps of:
passing the feedstock stream comprising oxygenates through a first reactor set including a single reactor or several reactors, and over a catalyst active in conversion of oxygenates, for partial conversion of the oxygenates, and through a second reactor set including a single reactor or several reactors for further conversion of the oxygenates and a phase separation stage in between the first reactor set and the second reactor set, for thereby forming the olefin stream,
wherein the process comprises:
passing the feedstock stream comprising oxygenates through the first reactor set under conditions for partly converting the oxygenates, thereby forming a raw olefin stream comprising unconverted oxygenates and C2-C8 olefins; and
passing the raw olefin stream through said phase separation stage, for producing:
a first olefin stream, which is rich in lower olefins;
a separated oxygenate stream comprising the unconverted oxygenates; and
a second olefin stream, which is rich in higher olefins;
combining the first olefin stream with the separated oxygenate stream comprising the unconverted oxygenates, thereby forming a combined stream comprising lower olefins and the unconverted oxygenates;
passing the resulting combined stream comprising lower olefins and unconverted oxygenates through the second reactor set under conditions for fully converting the unconverted oxygenates and the lower olefins, into a third olefin stream which is rich in higher olefins;
combining the second olefin stream with the third olefin stream, thereby forming said olefin stream.
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