US4297206A
Expired / Lapsed
US
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Solvent extraction of synfuel liquids
Assignee: Sunoco Inc R&M
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Filing: 1980-02-01
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Granted: 1981-10-27
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Expires: 2000-02-01
Abstract
Abstract An improvement in the solvent extraction of nonhydrocarbons from a synfuel liquid, e.g., shale oil, involves that the extract from the extractor, rather than being recycled directly back to the extractor, is first hydrotreated. A further improvement involves that a portion of the hydrotreated extract is fractionated and a light fraction is returned to the extractor. Use of the hydrotreated extract as recycle increases the efficiency of the extractor. A still further improvement involves the use as a selective solvent of one of the following: dialkylformamide, aldehydomorpholine, keto-morpholine, morpholine or an aliphatic aromatic ketone. These preferred solvents have the advantage of providing a clear interface between the extract and raffinate in the extractor. Removal of the nonhydrocarbons permits production of more hydrocarbons having enhanced utility as a jet fuel from a synfuel liquid than otherwise would be possible.
Inventors
- 👤 Edward G. Scheibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:32
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16; C10G21/20; C10G67/00; C10G67/02; C10G67/04; C10G67/0409; C10G67/0418
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
83 words
In the process of separating nonhydrocarbons from synfuel liquid by extraction using an extractor wherein a selective solvent contacts the synfuel liquid, a solvent-extract mixture is separated from a raffinate, the mixture is separated into the solvent and an extract, and the extract is returned to the extractor, the improvement which comprises hydrotreating all or a portion of the extract prior to return to the extractor, whereby nitrogen in the extract is eliminated as ammonia and the production of jet fuel is maximized.
Claim 2
Dependent Claim
83 words
In the process of separating nonhydrocarbons from synfuel liquid by extraction using an extractor wherein a selective solvent contacts the synfuel liquid, a solvent-extract mixture is separated from a raffinate, the mixture is separated into the solvent and an extract, and the extract is returned to the extractor, the improvement which comprises hydrotreating all or a portion of the extract prior to return to the extractor, whereby nitrogen in the extract is eliminated as ammonia and the production of jet fuel is maximized.
Claim 3
Dependent Claim
32 words
Process according to claim 1 wherein all or a portion of the hydrotreated extract is charged to a distillation unit from which a fraction is obtained and is returned to the extractor.
Claim 4
Dependent Claim
26 words
Process according to claim 1 or 2 wherein the selective solvent is selected from the group consisting of dialkylformamide, aldehydo-morpholine, keto-morpholine, morpholine and aliphatic aromatic ketone.
Claim 5
Dependent Claim
23 words
Process according to claim 1 or 2 wherein the synfuel liquid is selected from the group consisting of shale oil and coall liquid.
Claim 6
Dependent Claim
159 words
A process to maximize jet fuel production from a synfuel liquid comprising: (a) feeding a synfuel liquid to an extractor wherein a solvent extracts the lower boiling point nitrogen compounds and resulting solvent-extract mixture is separated from a raffinate which contains the higher boiling nitrogen compounds; (b) feeding the raffinate to a first fractionator wherein a fraction suitable for jet fuel is separated from the higher boiling nitrogen compounds, said nitrogen compounds then being fed to a first hydrotreater operating at conditions such that nitrogen in the higher boiling compounds is reacted to form ammonia; and (c) feeding the solvent-extract mixture from step (a) to a second fractionator wherein the solvent is separated from the extract containing the lower boiling point nitrogen compounds for return to the first fractionator, and feeding all or a portion of the resulting extract to a second hydrotreater operating at conditions such that nitrogen in the lower boiling compounds is reacted to form ammonia.
Claim 7
Dependent Claim
159 words
A process to maximize jet fuel production from a synfuel liquid comprising: (a) feeding a synfuel liquid to an extractor wherein a solvent extracts the lower boiling point nitrogen compounds and resulting solvent-extract mixture is separated from a raffinate which contains the higher boiling nitrogen compounds; (b) feeding the raffinate to a first fractionator wherein a fraction suitable for jet fuel is separated from the higher boiling nitrogen compounds, said nitrogen compounds then being fed to a first hydrotreater operating at conditions such that nitrogen in the higher boiling compounds is reacted to form ammonia; and (c) feeding the solvent-extract mixture from step (a) to a second fractionator wherein the solvent is separated from the extract containing the lower boiling point nitrogen compounds for return to the first fractionator, and feeding all or a portion of the resulting extract to a second hydrotreater operating at conditions such that nitrogen in the lower boiling compounds is reacted to form ammonia.
Claim 8
Dependent Claim
27 words
Process according to claim 5 wherein resulting product from hydrotreating the raffinate in step (b) is distilled into at least a jet fuel fraction and a residue.
Claim 9
Dependent Claim
21 words
Process according to claim 5 wherein resulting product from hydrotreating the extract in step (c) is recycled back to the extractor.
Claim 10
Dependent Claim
36 words
Process according to claim 7 wherein a portion of the product resulting from hydrotreating the extract is distilled into at least a residue which is fed to the first hydrotreater treating the higher boiling nitrogen compounds.
Claim 11
Dependent Claim
25 words
Process according to claim 5, 6, 7 or 8 wherein the synfuel liquid is selected from the group consisting of shale oil and coal liquid.
Claim 12
Dependent Claim
41 words
In the process of separating nonhydrocarbons from a synfuel liquid by extraction using a selective solvent, the improvement which comprises using as the selective solvent a solvent selected from the group consisting of dialkylformamide, aldehydo-morpholine, keto-morpholine, morpholine, and aliphatic aromatic ketone.
Claim 13
Dependent Claim
41 words
In the process of separating nonhydrocarbons from a synfuel liquid by extraction using a selective solvent, the improvement which comprises using as the selective solvent a solvent selected from the group consisting of dialkylformamide, aldehydo-morpholine, keto-morpholine, morpholine, and aliphatic aromatic ketone.
Claim 14
Dependent Claim
10 words
Process according to claim 10 wherein the dialkylformamide is N,N'-dimethylformamide.
Claim 15
Dependent Claim
12 words
Process according to claim 10 wherein the aliphatic aromatic ketone is acetophenone.
Claim 16
Dependent Claim
10 words
Process according to claim 10 wherein the solvent is morpholine.
Claim 17
Dependent Claim
25 words
Process according to claim 10, 11, 12 or 13 wherein the synfuel liquid is selected from the group consisting of shale oil and coal liquid.
References Cited (Backward Citations)
US2026812A
Cited
US2067137A
Cited
US2279550A
Cited
US2287736A
Cited
US2357667A
Cited
US2906693A
Cited
US4159940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |