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Patent US4643820A successfully refreshed from Google Patents.
US4643820A
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US
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Process for enhancing the cetane number of diesel fuel
Assignee: Rei Technologies Inc
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Filing: 1986-02-24
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Granted: 1987-02-17
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Expires: 2006-02-24
Abstract
Abstract A process for enhancement of the cetane number of a diesel fuel which in one embodiment comprises: (1) treating a diesel oil with a nitrogenous treating agent in a nitrogen amount, equivalent on a 100% nitric acid basis, to about 10 weight percent or less of the diesel oil feed; (2) removing unreacted nitrogenous treating agent from the diesel oil of step (1) to produce a treated diesel oil, and; (3) blending the treated diesel oil of step (2) with an untreated diesel oil to produce a blended diesel fuel such that the added nitrogen content in the blended diesel fuel is (a) about 300 ppm or less of nitrogen added when the diesel oil treated in step (1) is obtained from virgin diesel oil stock; or (b) about 450 ppm or less of nitrogen added when the diesel oil treated in step (1) is obtained from hydrotreated diesel oil stock.
Inventors
- 👤 Hossein Zarrineghbal
- 👤 James R. Kittrell
- 👤 Saeed T. Darian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:27
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/02; C10G17/00; C10G17/02; C10G27/00; C10G27/04; C10G27/12; C10L; C10L1/00; C10L1/04; C10L1/08
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
144 words
A process for enhancement of the cetane number of a diesel fuel comprising: (1) treating a diesel oil with a nitrogenous treating agent in a nitrogen amount, equivalent on a 100% nitric acid basis, of about 10 weight percent or less of the diesel oil feed; (2) removing unreacted nitrogenous treating agent from the diesel oil of step (1) to produce a treated diesel oil; and (3) blending the treated diesel oil of step (2) with an untreated diesel oil to produce a blended diesel fuel such that the added nitrogen content in the blended diesel fuel is (a) about 300 ppm or less when the diesel oil treated in step (1) is obtained from virgin diesel oil stock; or (b) about 450 ppm or less of nitrogen added when the diesel oil treated in step (1) is obtained from hydrotreated diesel oil stock.
Claim 2
Dependent Claim
144 words
A process for enhancement of the cetane number of a diesel fuel comprising: (1) treating a diesel oil with a nitrogenous treating agent in a nitrogen amount, equivalent on a 100% nitric acid basis, of about 10 weight percent or less of the diesel oil feed; (2) removing unreacted nitrogenous treating agent from the diesel oil of step (1) to produce a treated diesel oil; and (3) blending the treated diesel oil of step (2) with an untreated diesel oil to produce a blended diesel fuel such that the added nitrogen content in the blended diesel fuel is (a) about 300 ppm or less when the diesel oil treated in step (1) is obtained from virgin diesel oil stock; or (b) about 450 ppm or less of nitrogen added when the diesel oil treated in step (1) is obtained from hydrotreated diesel oil stock.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said nitrogenous treating agent is a gaseous nitrogenous treating agent.
Claim 4
Dependent Claim
16 words
The process of claim 1, wherein said nitrogenous treating agent is a liquid nitrogenous treating agent.
Claim 5
Dependent Claim
20 words
The process of claim 2, wherein said gaseous nitrogenous treating agent is NO 2 or N 2 O 4 .
Claim 6
Dependent Claim
18 words
The process of claim 3, wherein said liquid nitrogenous treating agent is an aqueous solution of nitric acid.
Claim 7
Dependent Claim
24 words
The process of claim 5, wherein the nitric acid is an aqueous solution or nitric acid containing up to about 90% by weight water.
Claim 8
Dependent Claim
21 words
The process of claim 3, wherein the liquid nitrogenous treating agent is liquid NO 2 or N 2 O 4 .
Claim 9
Dependent Claim
21 words
The process of claim 1, wherein said step (1) and/or step (2) is conducted in the presence of an organic acid.
Claim 10
Dependent Claim
15 words
The process of claim 8, wherein said organic acid is acetic acid or formic acid.
Claim 11
Dependent Claim
19 words
The process of claim 1, wherein said treatment step (1) is conducted in the presence of an inorganic acid.
Claim 12
Dependent Claim
15 words
The process of claim 10, wherein said inorganic acid is sulfuric acid or phosphoric acid.
Claim 13
Dependent Claim
39 words
The process of claim 1, wherein the weight ratio of said nitrogenous treating agent, in an amount equivalent on a 100% nitric acid basis, to said diesel oil feed of step (1), is of about 0.0002 to about 0.1.
Claim 14
Dependent Claim
39 words
The process of claim 1, wherein the weight ratio of said nitrogenous treating agent, in an amount equivalent on a 100% nitric acid basis, to said diesel oil feed of step (1), is of about 0.0005 to about 0.05.
Claim 15
Dependent Claim
17 words
The process of claim 1, wherein the removing of the excess nitrogenous treating agent is by decanting.
Claim 16
Dependent Claim
18 words
The process of claim 1, wherein the removing of the unreacted nitrogenous treating agent is by water washing.
Claim 17
Dependent Claim
19 words
The process of claim 1, wherein the removing of the unreacted nitrogenous treating agent is by washing with alkali.
Claim 18
Dependent Claim
19 words
The process of claim 1, wherein the removing of the unreacted nitrogenous treating agent is by treatment with clay.
Claim 19
Dependent Claim
20 words
The process of claim 1, wherein said blended diesel fuel obtained is a fuel meeting specifications for automotive diesel use.
Claim 20
Dependent Claim
20 words
The process of claim 1, wherein said blended diesel fuel obtained is a fuel meeting specifications for railroad diesel use.
Claim 21
Dependent Claim
21 words
The process of claim 1, wherein said blended diesel fuel obtained is a fuel meeting specifications for motor truck diesel use.
Claim 22
Dependent Claim
20 words
The process of claim 1, wherein said blended diesel fuel obtained is a fuel meeting specifications for marine diesel use.
Claim 23
Dependent Claim
134 words
A process for the enhancement of the cetane number of a non-fungible diesel fuel comprising (1) treating a first diesel oil with a nitrogenous treating agent in a nitrogen amount, equivalent on a 100% nitric acid basis, of about 10 weight percent or less of the diesel oil feed; (2) removing unreacted nitrogenous treating agent from the diesel oil of step (1); and (3) blending the treated diesel oil of step (2) with a second diesel oil which has not been treated as in step (1) above to produce a blended diesel fuel such that the added nitrogen content in the blended diesel fuel is about 1000 ppm or less and wherein the first diesel oil treated in step (1) and/or the second diesel oil blended in step (3) is a non-fungible diesel fuel.
Claim 24
Dependent Claim
134 words
A process for the enhancement of the cetane number of a non-fungible diesel fuel comprising (1) treating a first diesel oil with a nitrogenous treating agent in a nitrogen amount, equivalent on a 100% nitric acid basis, of about 10 weight percent or less of the diesel oil feed; (2) removing unreacted nitrogenous treating agent from the diesel oil of step (1); and (3) blending the treated diesel oil of step (2) with a second diesel oil which has not been treated as in step (1) above to produce a blended diesel fuel such that the added nitrogen content in the blended diesel fuel is about 1000 ppm or less and wherein the first diesel oil treated in step (1) and/or the second diesel oil blended in step (3) is a non-fungible diesel fuel.
Claim 25
Dependent Claim
16 words
The process of claim 22, wherein said nitrogenous treating agent is a gaseous nitrogenous treating agent.
Claim 26
Dependent Claim
16 words
The process of claim 22, wherein said nitrogenous treating agent is a liquid nitrogenous treating agent.
Claim 27
Dependent Claim
20 words
The process of claim 23, wherein said gaseous nitrogenous treating agent is NO 2 or N 2 O 4 .
Claim 28
Dependent Claim
18 words
The process of claim 24, wherein said liquid nitrogenous treating agent is an aqueous solution of nitric acid.
Claim 29
Dependent Claim
24 words
The process of claim 26, wherein the nitric acid is an aqueous solution of nitric acid containing up to about 90% by weight water.
Claim 30
Dependent Claim
21 words
The process of claim 24, wherein said liquid nitrogenous treating agent is liquid NO 2 or N 2 O 4 .
Claim 31
Dependent Claim
21 words
The process of claim 22, wherein said step (1) and/or step (2) is conducted in the presence of an organic acid.
Claim 32
Dependent Claim
15 words
The process of claim 29, wherein said organic acid is acetic acid or formic acid.
Claim 33
Dependent Claim
19 words
The process of claim 22, wherein said treatment step (1) is conducted in the presence of an inorganic acid.
Claim 34
Dependent Claim
15 words
The process of claim 31, wherein said inorganic acid is sulfuric acid or phosphoric acid.
Claim 35
Dependent Claim
39 words
The process of claim 22, wherein the weight ratio of said nitrogenous treating agent, in an amount equivalent on a 100% nitric acid basis to said diesel oil feed of step (1), is of about 0.0002 to about 0.1.
Claim 36
Dependent Claim
39 words
The process of claim 22, wherein the weight ratio of said nitrogenous treating agent, in an amount equivalent on a 100% nitric acid basis to said diesel oil feed to step (1), is of about 0.0005 to about 0.05.
Claim 37
Dependent Claim
17 words
The process of claim 22, wherein the removing of the unreacted nitrogenous treating agent is by decanting.
Claim 38
Dependent Claim
18 words
The process of claim 22, wherein the removing of the unreacted nitrogenous treating agent is by water washing.
Claim 39
Dependent Claim
19 words
The process of claim 22, wherein the removing of the excess nitrogenous treating agent is by washing with alkali.
Claim 40
Dependent Claim
19 words
The process of claim 22, wherein the removing of the excess nitrogeneous treating agent is by treatment with clay.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |