Process for converting methanol to olefins or gasoline
AssigneeAmoco Corporation
InventorsChristopher L. Marshall, Jeffery T. Miller
Life of this patent
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Abstract
A process for efficiently converting methanol to C.sub.3 -C.sub.12 olefins or paraffinic gasoline components is disclosed. A gaseous reaction mixture containing methanol and olefins is contacted with a solid acid catalyst in a reaction zone under conditions whereby a positive methanol concentration is maintained throughout the reaction zone. The process provides extended catalyst life, reduced deactivation rates, improved yields, and enhanced selectively for valuable products.
Claims29
A process for converting a methanol feedstream comprising at least one mole of methanol per mole of any olefins present in said feedstream to a hydrocarbon product selected from C.sub.3 -C.sub.12 olefins and paraffinic gasoline components, said method comprising the step of:
- contacting, in a backmixed reaction zone having a recycle to feed ratio of greater than about 3:1 and under methanol conversion conditions, a solid acid methanol conversion catalyst and a gaseous reaction mixture comprising said feedstream and conversion products thereof to form said hydrocarbon product selected from C.sub.3 -C.sub.12 olefins and paraffinic gasoline components.
A process for converting a methanol feedstream comprising at least one mole of methanol per mole of any olefins present in said feedstream to a hydrocarbon product selected from C.sub.3 -C.sub.12 olefins and paraffinic components, said method comprising the step of:
- contacting, in a backmixed reaction zone having a recycle to feed ratio of greater than about 3:1 and under methanol conversion conditions including a temperature in the range of about 600 to about 900.degree. F., a pressure in the range of atmospheric pressure to about 500 psig, and a weight hourly space velocity of about 0.1 to about 20 hr.sup.-1, a solid acid methanol conversion catalyst having an average pore diameter of at least about 5 angstroms and a gaseous reaction mixture comprising methanol from said feedstream in equilibrium with dehydration products thereof, C.sub.2 -C.sub.3 olefins, and said hydrocarbon product resulting from reaction of said methanol with said olefins to form said hydrocarbon product selected from C.sub.3 -C.sub.12 olefins and paraffinic gasoline components.
A process for converting a methanol feedstream comprising at least one mole of methanol per mole of any olefins present in said feedstream to a hydrocarbon product selected from C.sub.3 -C.sub.12 olefins and paraffinic gasoline components, said method comprising the step of:
- contacting, in a reaction zone defined by a reactor selected from the group consisting of backmixed fixed bed and fluidized bed reactors having a recycle to feed ratio of greater than about 3:1 and under methanol conversion conditions including a temperature in the range of about 600.degree. to about 900.degree. F., a pressure in the range of atmospheric pressure to about 500 psig, and a weight hourly space velocity of about 0.1 to about 20 hr.sup.-1, a silica-alumina or Y-zeolite methanol conversion catalyst having an average pore diameter of at least about 5 angstroms and a gaseous reaction mixture comprising methanol from said feedstream in equilibrium with dehydration products thereof, C.sub.2 -C.sub.3 olefins, and said hydrocarbon product resulting from reaction of said methanol with said olefins whereby a portion of said methanol is catalytically converted to C.sub.2 -C.sub.3 olefins and another portion of said methanol simultaneously reacts with olefins present in aid reaction mixture to produce said hydrocarbon product selected from C.sub.3 -C.sub.12 olefins and paraffinic gasoline components, said contacting step being carried out for a sufficiently short time period and under conditions selected such that said product comprises a maximum of about 30% by weight aromatic compounds.
Dependencies are inferred from the claim text.