High octane gasoline and distillates from oxygenates
AssigneeMobil Oil Corporation
InventorsMohsen N. Harandi, Hartley Owen
Life of this patent
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Abstract
An integrated process for the conversion of methanol to high octane gasoline and distillate. Methanol is converted to olefins in the presence of zeolite type catalyst. C.sub.4 and C.sub.5 olefin fraction is converted to MTBE and TAME in the presence of excess methanol and acid etherification catalyst. Unreacted methanol and hydrocarbons are passed to an olefins to gasoline and distillate oligomerization unit in conjunction with C.sub.3, C.sub.6 and C.sub.7 olefins from the methanol to olefins unit whereby distillate and LPG products are produced. Gasoline products from the oligomerization unit are passed to the etherification unit whereby an ether-rich gasoline fraction is separated.
Claims12
An integrated process for the conversion of methanol to high octane gasoline and distillate, comprising the steps of:
- (a) contacting oxygenated hydrocarbon feed with solid conversion catalyst in a conversion zone under oxygenate conversion conditions to produce an effluent stream comprising a major portion of olefinic hydrocarbons wherein said catalyst has a moderately low Bronsted acid activity;
- (b) fractionating said effluent stream to produce olefinic hydrocarbon streams comprising, first C.sub.2 - olefinic stream, second C.sub.3 olefinic stream, third C.sub.4 & C.sub.5 olefinic stream, fourth C.sub.6 & C.sub.7 olefinic stream and fifth C.sub.8 + olefinic stream;
- (c) passing said second C.sub.3 olefinic stream and said fourth C.sub.6 and C.sub.7 olefinic stream to an olefins oligomerization zone under oligomerization conditions in contact with medium pore size shape selective zeolite catalyst whereby C.sub.5 + gasoline and distillate are produced;
- (d) passing a hydrocarbon feedstream comprising a portion of step (c) C.sub.5 + gasoline, step (b) third C.sub.4 and C.sub.5 olefinic hydrocarbon stream in conjunction with a methanol feedstream to an etherification zone in contact with an acid etherification catalyst under etherification conditions to produce a mixture of high octaine ether-rich gasoline;
- (e) recovering a stream comprising unreacted methanol and C.sub.4 and C.sub.5 hydrocarbons and a stream comprising ether-rich gasoline;
- (f) passing step (e) stream comprising unreacted methanol and C.sub.4 and C.sub.5 hydrocarbons to step (c) oligomerization zone for conversion to gasoline and distillate.
Dependencies are inferred from the claim text.