US4270929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing gasoline of high octane number, in particular lead-free gasoline
Assignee: IFP Energies nouvelles
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Filing: 1979-08-31
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Granted: 1981-06-02
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Expires: 1999-08-31
Abstract
Abstract Process for producing gasoline of high octane number from C3 and C4 olefinic cuts, such as those obtained by fractional distillation of a C3 / C4 catalytic cracking cut, comprising the steps of: (a) oligomerizing propylene of the C3 cut to obtain a first gasoline fraction, (b) reacting the isobutene of the C4 cut with methanol to produce methyl tert.-butyl ether which is separated from the unreacted C4 hydrocarbons to form a second gasoline fraction, (c) alkylating said unreacted C4 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.
Inventors
- 👤 Quang Dang Vu
- 👤 Yves Chauvin
- 👤 Jean Gaillard
- 👤 Bernard Torck
- 👤 Michel Hellin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:21
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/30; C10; C10L; C10L1/00; C10L1/02; C10L1/023; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206; C07C2531/00; C07C2531/02; C07C2531/12; C07C2531/14; Y; Y02; Y02P; Y02P30/00; Y02P30/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
157 words
A process for producing a blended high octane gasoline, comprising the steps of: (a) oligomerizing an olefinic C 3 cut comprising propylene, and recovering an oligomerizate boiling in the gasoline range; (b) contacting a mixture of methanol and an olefinic C 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 4 hydrocarbons; (c) fractionating the effluent from step (b) and separately recovering a methyl tert.-butyl ether fraction and an unreacted C 4 hydrocarbon fraction comprising said at least one n-butene; (d) subjecting the unreacted C 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.
Claim 2
Dependent Claim
157 words
A process for producing a blended high octane gasoline, comprising the steps of: (a) oligomerizing an olefinic C 3 cut comprising propylene, and recovering an oligomerizate boiling in the gasoline range; (b) contacting a mixture of methanol and an olefinic C 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 4 hydrocarbons; (c) fractionating the effluent from step (b) and separately recovering a methyl tert.-butyl ether fraction and an unreacted C 4 hydrocarbon fraction comprising said at least one n-butene; (d) subjecting the unreacted C 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.
Claim 3
Dependent Claim
39 words
A process according to claim 1 wherein the C 3 cut used in step (a) and the C 4 cut used in step (b) are each produced by fractional distillation of a C 3 /C 4 catalytic cracking cut.
Claim 4
Dependent Claim
34 words
A process according to claim 1, wherein the oligomerization in step (a) is effected in the presence of a catalyst obtained by contacting a group IV to VIII metal compound with an alkylaluminum compound.
Claim 5
Dependent Claim
22 words
A process according to claim 3, wherein the alkylaluminum compound is a hydrocarbylaluminum halide and the metal compound is a nickel compound.
Claim 6
Dependent Claim
26 words
A process according to claim 1, wherein the etherification reaction between the C 4 cut and methanol is effected in the presence of a sulfonated resin.
Claim 7
Dependent Claim
20 words
A process according to claim 1, wherein the alkylation in step (d) is effected in the presence of hydrofluoric acid.
Claim 8
Dependent Claim
44 words
A process according to claim 1, wherein the isobutane/C 4 olefins ratio in the unreacted C 4 hydrocarbon fraction from step (c) is lower than 1, and isobutane is added to increase this ratio to at least 1 in the feed to step (d).
Claim 9
Dependent Claim
37 words
A process according to claim 2, wherein said C 3 /C 4 catalytic cracking cut has the following composition, by weight: ______________________________________
propylene 15-35%
isobutane 15-30%
isobutene 5-15%
1-butene 3-10%
2-butenes 10-25%
propane + n-butane 8-30%
______________________________________
Claim 10
Dependent Claim
45 words
A process according to claim 1, wherein the C 3 art used in step (a) and the C 4 cut used in step (b) have the following respective compositions, by weight: ______________________________________
C.sub.3 cut C.sub.4 cut
______________________________________
propane:15-50% n-butane:5-20%
propylene:50-85% isobutane:20-50%
isobutene:10-25%
1-butene:5-15%
2-butene:10-40%
______________________________________
References Cited (Backward Citations)
US2403869A
Cited
US3912463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |