Stratco, Inc.

James Kevin Millard

Ken Edward Kranz

Lyle Frederick Albright

David Campbell Graves

Disclosed are various embodiments for alkylating olefins and isoparaffins in the presence of an acid to reduce and/or control acid consumption or maximize and/or control the octane number of the produced alkylate product. One embodiment includes alkylation by controlling the C,/iso-C,olefin ratio to reduce acid consumption. Another embodiment includes alkylation of C,and C,olefins in separate alkylation zones to maximize alkylate octane number. Even another embodiment includes propylene alkylation followed by C,and/or C,olefin alkylation, with the spent propylene acid used in the C,and/or C,olefin alkylation. Still another embodiment includes alkylation of C,, C,and C,olefins in separate alkylation zones, with the spent propylene acid used in the C,alkylation, and the spent butylene acid used in the C,alkylation. Yet another embodiment includes alkylation by controlling the C,/C,olefin ratio to maximize the octane number of the produced alkylate.

Alkylation by controlling olefin ratios

Disclosed are various embodiments for alkylating olefins and isoparaffins in the presence of an acid to reduce and/or control acid consumption or maximize and/or control the octane number of the produced alkylate product. One embodiment includes alkylation by controlling the C.sub.3 /C.sub.5 olefin ratio to reduce acid consumption. Another embodiment includes alkylation of C.sub.3 and C.sub.5 olefins in separate alkylation zones to maximize alkylate octane number. Even another embodiment includes propylene alkylation followed by C.sub.4 and/or C.sub.5 olefin alkylation, with the spent propylene acid used in the C.sub.4 and/or C.sub.5 olefin alkylation. Still another embodiment includes alkylation of C.sub.3, C.sub.4 and C.sub.5 olefins in separate alkylation zones, with the spent propylene acid used in the C.sub.4 alkylation, and the spent butylene acid used in the C.sub.5 alkylation. Yet another embodiment includes alkylation by controlling the C.sub.3 /C.sub.4 olefin ratio to maximize the octane number of the produced alkylate.

Disclosed is an alkylation process in which C.sub.3 to C.sub.5 olefins are reacted with an isoparaffin mixture of isobutane and isopentane in the presence of a catalyst. Varying the amount of isopentane present in the mixture can control and/or eliminate the amount of isopentane produced in the alkylation reaction. The disclosed reaction has an improved alkylation yield, and also produces an alkylate having a lowered Reid Vapor Pressure and results in lowered olefin content for reformulated gasoline.

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Kansas City, MO, United States of America

James Kevin Millard