Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Patent
1991-07-31
1993-08-10
Morris, Theodore
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
208106, 208120, 208134, C10G 5700, C10G 6304
Patent
active
052345769
ABSTRACT:
The present invention discloses a process for increasing the selectivity of the production of isobutylene in an admixture of C.sub.4 olefins, in a process comprising producing isobutylene, with high selectivity, comprising catalytically producing a first composition comprising at least one C.sub.4 olefin selected from the group consisting of 1-butene, cis-2-butene, trans-2-butene, admixtures thereof and 2-methylpropene admixed with at least one of said 1-butene, cis-2-butene, and trans-2-butene, by passing paraffin containing feed, which feed is free of aromatics, and in which the paraffin contains 5 to 20 carbon atoms, in the vapor phase, over a first catalyst composition, wherein the catalyst comprises ZSM-5 or ZSM-12, and increasing the isobutylene content of the first composition by producing a second composition, by contacting the first composition with a second catalyst composition comprising ZSM-23 under conditions in which the second composition is in the vapor phase, while maintaining the total C.sub.4 olefin content of the second composition substantially identical to the total C.sub.4 olefin content of the first composition.
REFERENCES:
patent: 4749819 (1988-06-01), Hamilton, Jr.
patent: 4753720 (1988-06-01), Morrison
patent: 4892643 (1990-01-01), Herbst et al.
patent: 4969987 (1990-11-01), Le et al.
Haag Werner O.
Harandi Mohsen N.
Owen Hartley
Griffin Walter D.
Keen Malcolm D.
McKillop Alexander J.
Mobil Oil Corporation
Morris Theodore
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