US4665245A
Expired / Lapsed
US
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Process for preparing alpha-olefins from light olefins
Assignee: Mobil Oil AS
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Filing: 1986-01-03
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Granted: 1987-05-12
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Expires: 2006-01-03
Abstract
Abstract A process for preparing alpha-olefins is provided which comprises: (a) converting a feed containing one or more lower olefins in the presence of a medium pore crystalline silicate zeolite catalyst under reaction conditions providing a mixture of higher olefinic products; (b) contacting at least a part of the mixture of higher olefinic products resulting from step (a) with an alpha-olefin in the presence of a metathesis catalyst under olefin metathesis conditions to provide a mixture of alpha-olefins having a different carbon number than the feed olefin; (c) separating the alpha-olefin product of step (b) into at least two fractions, one fraction containing predominantly lower alpha-olefin hydrocarbons and the other fraction containing predominantly higher alpha-olefin hydrocarbons; and, (d) recycling at least a part of the lower alpha-olefin hydrocarbon fraction resulting from step (c) as feed for step (a).
Inventors
- 👤 Richard J. Quann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:22
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
148 words
A process for preparing alpla-olefins is provided which comprises: (a) converting a feed containing a mixture of lower alpha-olefin hydrocarbons in the presence of a medium pore crystalline silicate zeolite catalyst under reaction conditions providing a mixture of higher olefinic products including slightly branched higher olefininc products; (b) contacting at least a part of the slightly branched higher olefinic products resulting from step (a) with an alpha-olefin in the presence of a metathesis catalyst under olefin metathesis conditions to provide a mixture of slightly branched alpha-olefins having a different carbon number than the feed olefin; (c) separating the alpha-olefin product of step (b) into at least two fractions, one fraction containing predominantly lower alpha-olefin hydrocarbons and the other fraction containing predominantly slightly branched higher alpha-olefin hydrocarbons; and, (d) recycling at least a part of the lower alpha-olefin hydrocarbon fraction resulting from step (c) as feed for step (a).
Claim 2
Dependent Claim
148 words
A process for preparing alpla-olefins is provided which comprises: (a) converting a feed containing a mixture of lower alpha-olefin hydrocarbons in the presence of a medium pore crystalline silicate zeolite catalyst under reaction conditions providing a mixture of higher olefinic products including slightly branched higher olefininc products; (b) contacting at least a part of the slightly branched higher olefinic products resulting from step (a) with an alpha-olefin in the presence of a metathesis catalyst under olefin metathesis conditions to provide a mixture of slightly branched alpha-olefins having a different carbon number than the feed olefin; (c) separating the alpha-olefin product of step (b) into at least two fractions, one fraction containing predominantly lower alpha-olefin hydrocarbons and the other fraction containing predominantly slightly branched higher alpha-olefin hydrocarbons; and, (d) recycling at least a part of the lower alpha-olefin hydrocarbon fraction resulting from step (c) as feed for step (a).
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the catalyst of step (a) is HZSM-5.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein step (a) is carried out in a series of reactors.
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein the ratio of intra-crystalline acid sites to surface active sites in the catalyst of step (a) is increased prior to utilization of the catalyst.
Claim 6
Dependent Claim
26 words
The process of claim 2 wherein the ratio of intra-crystalline acid sites to surface active sites of HZSM-5 is increased prior to utilization of the catalyst.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the metathesis catalyst of step (b) is a supported oxide of molybdenum, tungsten or rhenium.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the catalyst of step (b) additionally contains a rare earth metal oxide.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein a stoichiometric excess of alpha-olefin is employed in step (b).
Claim 10
Dependent Claim
13 words
The process of claim 1 wherein the alpha-olefin in step (b) is ethylene.
Claim 11
Dependent Claim
27 words
The process of claim 1 wherein in step (c), the alpha-olefin product of step (b) is separated into a light alpha-olefin fraction and a heavy alpha-olefins fraction.
Claim 12
Dependent Claim
30 words
The process of claim 10 wherein the light fraction is predominantly made up of C 3-8 alpha-olefins and the heavy fraction is predominantly made up of C 9 + alpha-olefins.
Claim 13
Dependent Claim
37 words
The process of claim 1 wherein in step (c), the alpha-olefin product of step (b) is separated into a light, intermediate and heavy alpha-olefin fraction and the light and heavy alpha-olefin fractions are recycled to step (a).
Claim 14
Dependent Claim
41 words
The process of claim 12 wherein the light fraction is predominantly made up of C 3-8 alpha-olefins, the intermediate fraction is predominantly made up of C 9-18 alpha-olefins and the heavy fraction is predominantly made up of C 19 + alpha-olefins.
Claim 15
Dependent Claim
21 words
The process of claim 1 wherein the entire olefinic hydrocarbon effluent from step (a) is employed as feed for step (b).
Claim 16
Dependent Claim
26 words
The process of claim 1 wherein in step (d), the entire lower alpha-olefin hydrocarbon fraction resulting from step (c) is recycled as cofeed for step (a).
Claim 17
Dependent Claim
27 words
The process of claim 9 wherein, following step (b), unreacted ethylene is separated from the alpha-olefin product effluent, said ethylene being recycled as cofeed to step (b).
Claim 18
Dependent Claim
19 words
The process of claim 1 for continuously preparing alpha-olefins predominantly within the C 9 + range of carbon content.
Claim 19
Dependent Claim
18 words
The process of claim 1 for continuously preparing alpha-olefins predominantly within the C 9-18 range of carbon content.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |