Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – With hydrocarbon effluent stream splitting for recycle to...
Patent
1986-07-11
1987-04-14
Pal, Asok
Chemistry of hydrocarbon compounds
Plural serial diverse syntheses
With hydrocarbon effluent stream splitting for recycle to...
208DIG1, 364500, 585331, 585332, 585401, 585501, 585701, 585709, 585956, C07C 200
Patent
active
046580735
ABSTRACT:
A process control technique for upgrading C.sub.3 -C.sub.4 hydrocarbon feed containing olefins to produce heavier liquid hydrocarbons comprising converting a major portion of C.sub.3 -C.sub.4 olefins in an oligomerization zone by contacting a shape selective medium pore zeolite catalyst at elevated temperature and pressure to make distillate and olefinic gasoline. The oligomerization stage effluent is fractionated to provide distillate and gasoline product and a C.sub.3 -C.sub.4 intermediate stream containing isobutane and unconverted propene and butylene. The C.sub.3 -C.sub.4 intermediate stream is combined under control with a portion of C.sub.3 -C.sub.4 feed and further converting the combined streams in an alkylation zone to make heavier paraffinic hydrocarbons. The olefin feed may be produced by catalytically converting methanol or similar oxygenated hydrocarbons in a known process. Controlled material balance is achieved by accumulating liquid olefin feed to the oligomerization and akylation units using a surge drum with liquid level control. By-product isobutane is recovered and recycled under liquid level control operatively connected to determine feed of liquid olefin to the conversion units.
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Hydrocarbon Processing, Feb. 1986, pp. 53, 55.
Gilman Michael G.
McKillop Alexander J.
Mobil Oil Corporation
Pal Asok
Wise L. G.
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