US4494961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing the cetane number of diesel fuel by partial oxidation _
Assignee: Mobil Oil AS
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Filing: 1983-06-14
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Granted: 1985-01-22
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Expires: 2003-06-14
Abstract
Abstract The invention provides a method for increasing the cetane number of a low hydrogen content, highly aromatic distillate fuel by subjecting it to catalytic partial oxidation. Catalysts employed include transition metal oxides alone or in conjuction with alkali metal or alkaline earth metal compounds. Partial oxidation in accordance with the method of this invention not only results in cetane number improvement, but also allows a higher concentration of aromatic substituents in the fuel blend.
Inventors
- 👤 Chaya Venkat
- 👤 Dennis E. Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:19
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/02; C10L1/026; C10G; C10G27/00; C10G27/04; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A method for improving the cetane number of a low hydrogen content, highly aromatic diesel boiling range fuel by heating same under mild oxidation conditions in the presence of a catalyst system comprising (1) an alkaline earth metal permanganate, (2) an oxide of a metal group Groups IB, IIB, IIIB, IVB, VB, VIB, VIIB or VIII of the Periodic Table, or (3) a mixture of (2) and an alkali metal or alkaline earth metal oxide or salt.
Claim 2
Independent Claim
77 words
A method for improving the cetane number of a low hydrogen content, highly aromatic diesel boiling range fuel by heating same under mild oxidation conditions in the presence of a catalyst system comprising (1) an alkaline earth metal permanganate, (2) an oxide of a metal group Groups IB, IIB, IIIB, IVB, VB, VIB, VIIB or VIII of the Periodic Table, or (3) a mixture of (2) and an alkali metal or alkaline earth metal oxide or salt.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said catalyst is an alkaline earth metal permanganate.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the alkaline earth metal is potassium.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said catalyst is the catalyst of (2).
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein the catalyst of (2) is V 2 O 5 .
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said catalyst is the catalyst of (3).
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein the catalyst of (3) is a mixture of V 2 O 5 and KNO 3 .
Claim 9
Dependent Claim
43 words
The method of claim 1 wherein the alkali metal or alkaline earth metal oxide or salt is present in the mixture with the oxides of (2) to the extent of from about 1% by weight to about 50% by weight of the mixture.
Claim 10
Dependent Claim
19 words
The method of claim 1 wherein the temperature of oxidation is from about 50° C. to about 350° C.
Claim 11
Dependent Claim
18 words
The method of claim 1 wherein the pressure during reaction is from about 0.5 to about 50 atmospheres.
Claim 12
Dependent Claim
22 words
The method of claim 1 wherein the flow rate of feed over the catalyst is from about 0.5 to about 50 LHSV.
Claim 13
Dependent Claim
19 words
The method of claim 7 wherein the V 2 O 5 and KNO 3 are present in equal weights.
References Cited (Backward Citations)
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Cited
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Cited
US2560542A
Cited
US2460700A
Cited
US2890108A
Cited
US3348932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |