US 4,270,929 AGranted

Process for producing gasoline of high octane number, in particular lead-free gasoline

AssigneeInstitut Francais du Petrole

InventorsQuang Dang Vu, Yves Chauvin, Jean Gaillard, Bernard Torck, Michel Hellin

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Abstract

Process for producing gasoline of high octane number from C.sub.3 and C.sub.4 olefinic cuts, such as those obtained by fractional distillation of a C.sub.3 / C.sub.4 catalytic cracking cut, comprising the steps of: (a) oligomerizing propylene of the C.sub.3 cut to obtain a first gasoline fraction, (b) reacting the isobutene of the C.sub.4 cut with methanol to produce methyl tert.-butyl ether which is separated from the unreacted C.sub.4 hydrocarbons to form a second gasoline fraction, (c) alkylating said unreacted C.sub.4 hydrocarbons with isobutane in the presence of an alkylation catalyst such as hydrofluoric acid, to form a third gasoline fraction, and (d) admixing, at least partially, said first, second and third gasoline fractions, so as to obtain gasoline of high octane number.

Claims9

Dependent claims

A process for producing a blended high octane gasoline, comprising the steps of:

(a) oligomerizing an olefinic C.sub.3 cut comprising propylene, and recovering an oligomerizate boiling in the gasoline range;
(b) contacting a mixture of methanol and an olefinic C.sub.4 cut comprising isobutene, isobutane and at least one n-butene with an acid catalyst under isobutene etherification conditions to produce methyl tert.-butyl ether and unreacted C.sub.4 hydrocarbons;
(c) fractionating the effluent from step (b) and separately recovering a methyl tert.-butyl ether fraction and an unreacted C.sub.4 hydrocarbon fraction comprising said at least one n-butene;
(d) subjecting the unreacted C.sub.4 hydrocarbon fraction from step (c) to aliphatic alkylation conditions, and recovering an alkylate boiling in the gasoline range;
and
(e) blending at least a portion of said oligomerizate with at least a portion of said methyl tert.-butyl ether fraction and at least a portion of said alkylate, and recovering a blended high octane gasoline.

3 more elements

Dependencies are inferred from the claim text.