| US 7,586,018 B2 | ||
| Oxygenate conversion to olefins with dimerization and metathesis | ||
| Andrea G. Bozzano, Northbrook, Ill. (US); and Bryan K. Glover, Algonquin, Ill. (US) | ||
| Assigned to UOP LLC, Des Plaines, Ill. (US) | ||
| Filed on Dec. 21, 2006, as Appl. No. 11/643,604. | ||
| Prior Publication US 2008/0154078 A1, Jun. 26, 2008 | ||
| Int. Cl. C07C 1/207 (2006.01); C07C 6/04 (2006.01) | ||
| U.S. Cl. 585—317 [585/329; 585/638; 585/643] | 7 Claims |
| 1. A process for producing light olefins from an oxygenate-containing feedstock, the process comprising:
contacting the oxygenate-containing feedstock in an oxygenate conversion reactor with an oxygenate conversion catalyst and
at reaction conditions effective to convert the oxygenate-containing feedstock to an oxygenate conversion effluent stream
comprising light olefins and C4+ hydrocarbons, wherein the oxygenate-containing feedstock is selected from the group consisting of methanol, ethanol, dimethyl
ether, diethyl ether, and combinations thereof, the light olefins comprise a quantity of ethylene and the C4+ hydrocarbons comprise a quantity of diolefins and a quantity of butenes including a quantity of 1-butenes;
separating the oxygenate conversion effluent stream in a separation zone and forming a first process stream comprising at
least a portion of the quantity of ethylene from the oxygenate conversion effluent stream;
dimerizing at least a portion of the quantity of ethylene from the first process stream in a dimerization zone to produce
a dimerized stream comprising a residual quantity of ethylene, a quantity of butenes including a quantity of 1-butenes and
a quantity hexenes;
metathesizing at least a portion of the residual quantity of ethylene from the dimerized steam with at least a portion of
the quantity of hexenes from the dimerized stream in a first metathesis zone to produce a first metathesis effluent stream
comprising a quantity of butenes including a quantity of 1-butenes, and a quantity of propylene;
isomerizing at least a portion of the quantity of 1-butenes from the first metathesis effluent stream in an isomerization
zone to produce isomerized stream comprising a quantity of 2-butenes;
metathesizing at least a portion of the quantity of 2-butenes from the isomerized stream with ethylene in a second metathesis
zone to produce a second metathesis effluent stream comprising propylene; and
recovering propylene from the second metathesis effluent stream.
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