Patent US4456781A successfully refreshed from Google Patents.
US4456781A
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Catalytic conversion system for oligomerizing olefinic feedstock to produce heavier hydrocarbons
Assignee: Mobil Oil AS
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Filing: 1983-04-26
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Granted: 1984-06-26
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Expires: 2003-04-26
Abstract
Abstract A continuous catalytic process for oligomerizing lower olefins to heavier hydrocarbons wherein a continuous liquid olefinic feedstream is diluted with a liquid alkane stream, is improved by a technique which comprises cooling catalytically converted effluent, fractionating the effluent to obtain a condensed lower aliphatic recycle stream, a liquid C3-C4 product stream, a liquid product stream consisting essentially of C5+ hydrocarbons and a gaseous C2- gaseous stream by the sequential fractionation steps of: debutanizing the cooled effluent to obtain the liquid C5+ hydrocarbon stream and a condensed lower aliphatic stream; de-ethanizing a portion of the lower aliphatic stream to recover gaseous offgas stream and a C3-C4 alkane product stream; and optionally recycling at least a portion of the condensed aliphatic stream from the debutanizing step for dilution of the olefinic feedstream.
Inventors
- 👤 Susan K. Marsh
- 👤 Hartley Owen
- 👤 Bernard S. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:05
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C9/00; C07C9/02; C10; C10G; C10G50/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
143 words
In a continuous catalytic process for oligomerizing lower olefins to heavier hydrocarbons wherein a continuous liquid olefinic feedstream is diluted with a liquid alkane stream and contracted with oligomerization catalyst, the improvement which comprises: cooling catalytically converted effluent, fractionating the effluent to obtain a condensed lower aliphatic recycle stream, a liquid C 3 -C 4 product stream, a liquid product stream consisting essentially of C 5 + hydrocarbons and a gaseous C 2 - gaseous stream by the sequential fractionation steps of debutanizing the cooled effluent to obtain the liquid C 5 + hydrocarbon stream and condensed lower aliphatic stream; de-ethanizing a portion of the lower aliphatic stream to recover gaseous ethane stream and a C 3 -C 4 alkane product stream; and recycling at least a portion of the condensed aliphatic stream from the debutanizing step for dilution of the olefinic feedstream.
Claim 2
Dependent Claim
143 words
In a continuous catalytic process for oligomerizing lower olefins to heavier hydrocarbons wherein a continuous liquid olefinic feedstream is diluted with a liquid alkane stream and contracted with oligomerization catalyst, the improvement which comprises: cooling catalytically converted effluent, fractionating the effluent to obtain a condensed lower aliphatic recycle stream, a liquid C 3 -C 4 product stream, a liquid product stream consisting essentially of C 5 + hydrocarbons and a gaseous C 2 - gaseous stream by the sequential fractionation steps of debutanizing the cooled effluent to obtain the liquid C 5 + hydrocarbon stream and condensed lower aliphatic stream; de-ethanizing a portion of the lower aliphatic stream to recover gaseous ethane stream and a C 3 -C 4 alkane product stream; and recycling at least a portion of the condensed aliphatic stream from the debutanizing step for dilution of the olefinic feedstream.
Claim 3
Dependent Claim
33 words
In a continuous catalytic process according to claim 1, the further step of fractionating the liquid C 5 + product stream into a gasoline range hydrocarbon stream and a distillate range hydrocarbon stream.
Claim 4
Dependent Claim
31 words
In a continuous catalytic process according to claim 2, the further step of recycling at least a portion of liquid gasoline range olefinic hydrocarbons to combine with the liquid olefin feedstream.
Claim 5
Dependent Claim
131 words
In a continuous catalytic process for converting olefins to gasoline or diesel fuel wherein a continuous olefinic feedstream is diluted with a diluent stream and contracted with oligomerization catalyst, the improvement which comprises: cooling catalytically converted effluent, fractionating the effluent to obtain a condensed lower aliphatic stream rich in C 3 -C 4 alkanes and a liquid product stream consisting essentially of C 5 + hydrocarbons by the sequential fractionation steps of (a) debutanizing the cooled effluent to obtain the liquid C 5 + hydrocarbon stream and a lower aliphatic overhead vapor stream; (b) condensing and recycling at least a portion of the lower aliphatic stream; and (c) de-ethanizing a portion of said lower aliphatic stream to provide LPG product containing at least 80 mole % C 3 -C 4 alkanes.
Claim 6
Dependent Claim
131 words
In a continuous catalytic process for converting olefins to gasoline or diesel fuel wherein a continuous olefinic feedstream is diluted with a diluent stream and contracted with oligomerization catalyst, the improvement which comprises: cooling catalytically converted effluent, fractionating the effluent to obtain a condensed lower aliphatic stream rich in C 3 -C 4 alkanes and a liquid product stream consisting essentially of C 5 + hydrocarbons by the sequential fractionation steps of (a) debutanizing the cooled effluent to obtain the liquid C 5 + hydrocarbon stream and a lower aliphatic overhead vapor stream; (b) condensing and recycling at least a portion of the lower aliphatic stream; and (c) de-ethanizing a portion of said lower aliphatic stream to provide LPG product containing at least 80 mole % C 3 -C 4 alkanes.
Claim 7
Dependent Claim
30 words
The process of claim 4 including the steps of pressurizing and recycling at least a portion of unde-ethanized condensed lower alkane stream for diluting the olefinic feedstream at process pressure.
Claim 8
Dependent Claim
25 words
The process of claim 4 comprising the further step of combining a light hydrocarbon refinery stream with the lower aliphatic stream portion prior to de-ethanizing.
Claim 9
Dependent Claim
33 words
The process of claim 4 which comprises the further steps of at least partially cooling catalytic reactor effluent sequentially by heat exchange with reactor feed stock and by reboiling liquid de-ethanizer tower bottoms.
Claim 10
Dependent Claim
20 words
The process of claim 4 wherein substantially the entire de-butanizer overhead vapor stream is condensed prior to recycle and de-ethanizing.
Claim 11
Dependent Claim
22 words
The process of claim 4 wherein said oligomerization catalyst comprises acid zeolite characterized by a pore dimension greater than about 5 Angstroms.
Claim 12
Dependent Claim
19 words
The process of claim 3 wherein said zeolite has a silica to alumina mole ratio of at least 12.
Claim 13
Dependent Claim
13 words
The process of claim 10 wherein said zeolite consists essentially of acid ZSM-5.
Claim 14
Dependent Claim
18 words
The process of claim 10 wherein said zeolite has an acid cracking activity of about 160 to 200.
Claim 15
Dependent Claim
19 words
The process of claim 4 wherein substantially all LPG product from de-ethanizing is recovered as product of the process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |