Process for the joint production of highly pure 1-butene and premium gasoline from a C.sub.4 olefinic cut
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United States of America Patent
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Dec 27, 1983
Grant Date -
N/A
app pub date -
Jun 25, 1982
filing date -
Jun 26, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Highly pure 1-butene and premium gasoline are obtained by (a) subjecting a C.sub.4 olefinic cut to a polymerization-disproportionation to partly convert the isobutene thereof to a gasoline which, in turn, by partial disproportionation, yields a jet fuel base and butenes, (b) fractionating the effluent from step (a) to a mixture (.alpha.) of gasoline and jet fuel base and to a fraction (.beta.) containing isobutane, n-butane, butenes, a small amount of isobutene and a minor amount of butadiene, (c) selectively polymerizing fraction (.beta.) to convert more than 90% of the isobutene thereof to gasoline, (d) fractionating the polymerized fraction (.beta.) to a gasoline cut (.gamma.) containing isobutene dimers and trimers and to a fraction (.delta.) containing isobutane, n-butane and butenes, (e) selectively hydrogenating the fraction (.delta.), (f) removing isobutane from the hydrogenated fraction (.delta.) and (g) fractionating the deisobutanized hydrogenated fraction (.delta.) to obtain a fraction containing at least 99% of 1-butene, the mixture (.alpha.) being admixed with the cut (.gamma.).
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