Patent US4705534A successfully refreshed from Google Patents.
US4705534A
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US
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Cetane number of diesel fuel by incorporating polynitrate esters and stabilizers
Assignee: Mobil Oil AS
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Filing: 1985-11-15
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Granted: 1987-11-10
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Expires: 2005-11-15
Abstract
Abstract Mixtures of polynitrate esters and selected amines are effective in improving the cetane number of diesel and alcohol fuels.
Inventors
- 👤 Tsoung Y. Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:41
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/23; C10L1/231; C10L1/222; C10L1/2227; C10L1/223; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
48 words
A liquid fuel composition adapted for use in a diesel engine, comprising diesel fuel boiling within the range of 200°-850° F. containing a cetane number-increasing amount of a mixture of fuel-soluble polynitrate esters and a stabilizer selected from the group consisting of diphenyl amine, diethyl diphenylurea and 2-dinitrodiphenylamine.
Claim 2
Dependent Claim
48 words
A liquid fuel composition adapted for use in a diesel engine, comprising diesel fuel boiling within the range of 200°-850° F. containing a cetane number-increasing amount of a mixture of fuel-soluble polynitrate esters and a stabilizer selected from the group consisting of diphenyl amine, diethyl diphenylurea and 2-dinitrodiphenylamine.
Claim 3
Dependent Claim
43 words
The composition of claim 1 wherein the polynitrate ester is selected from the group consisting of ethylene glycol dinitrate, diethylene glycol dinitrate, triethylene glycol dinitrate, 2-methyl-2 [(nitroxy)methyl]-1,3-propanediol dinitrate ester, butanetriol trinitrate 1,3, propanediol dinitrate, nitroglycerin, cellulose tri, di, and mononitrate and mixtures thereof.
Claim 4
Dependent Claim
26 words
The composition of claim 1 wherein the concentration of stabilizer is between about 0.01 percent and about 5 percent of the weight of polynitrate ester present.
Claim 5
Dependent Claim
26 words
The composition of claim 1 wherein the concentration of stabilizer is between about 0.1 percent and about 1 percent of the weight of polynitrate ester present.
Claim 6
Dependent Claim
31 words
The composition of claim 1 wherein the concentration of polynitrate ester in said liquid fuel composition is between about 0.05 percent and about 1 percent of the weight of liquid fuel.
Claim 7
Dependent Claim
16 words
The composition of claim 1 wherein the polynitrate esters are mixtures of mono, di- and polynitrates.
Claim 8
Dependent Claim
36 words
The composition of claim 1 wherein the polynitrate esters are mixtures of two or more polynitrate esters selected from the group consisting of ethylene glycol dinitrate, diethylene glycol dinitrate, triethylene glycol dinitrate, 2-methyl-2[(nitroxy)methyl]-1,3-propanediol dinitrate, and nitroglycerin.
Claim 9
Dependent Claim
14 words
The composition of claim 1 wherein said fuel is a coal derived diesel fuel.
Claim 10
Independent Claim
44 words
A method for improving the cetane-rating of a liquid diesel fuel comprising adding to said fuel: (1) a cetane-number-increasing amount of a fuel-soluble polynitrate ester and (2) a stabilizer selected from the group consisting of diphenyl amine, diethyl diphenylurea and 2-dinitrodiphenylamine and mixtures thereof.
Claim 11
Independent Claim
44 words
A method for improving the cetane-rating of a liquid diesel fuel comprising adding to said fuel: (1) a cetane-number-increasing amount of a fuel-soluble polynitrate ester and (2) a stabilizer selected from the group consisting of diphenyl amine, diethyl diphenylurea and 2-dinitrodiphenylamine and mixtures thereof.
Claim 12
Dependent Claim
41 words
The method of claim 9 wherein the polynitrate ester is selected from the group consisting of ethylene glycol dinitrate (EGD), diethylene glycol dinitrate, DEGN, triethylene glycol dinitrate (TEGN), 2-methyl-2 [(nitroxy)methyl]-1,3-propanediol dinitrate (PDN), nitroglycerin, cellulose tri, di, and mononitrate and their mixtures.
Claim 13
Dependent Claim
26 words
The method of claim 9 wherein the concentration of stabilizer is between about 0.01 percent and about 5 percent of the weight of polynitrate ester present.
Claim 14
Dependent Claim
26 words
The method of claim 9 wherein the concentration of stabilizer is between about 0.1 percent and about 1 percent of the weight of polynitrate ester present.
Claim 15
Dependent Claim
29 words
The method of claim 9 wherein the concentration of polynitrate ester in said liquid fuel composition is between 0.05 percent and 1 percent of the weight of liquid fuel.
Claim 16
Dependent Claim
14 words
The method of claim 9 wherein said fuel is a coal derived diesel fuel.
Claim 17
Independent Claim
34 words
A method for physically handling and transporting a diesel fuel containing an unstable polynitrate ester comprising adding to said mixture a stabilizer selected from the group consisting of diphenyl amine, diethyl diphenylurea, and 2-dinitrodiphenylamine.
Claim 18
Independent Claim
34 words
A method for physically handling and transporting a diesel fuel containing an unstable polynitrate ester comprising adding to said mixture a stabilizer selected from the group consisting of diphenyl amine, diethyl diphenylurea, and 2-dinitrodiphenylamine.
Claim 19
Dependent Claim
43 words
The method of claim 15 wherein said polynitrate ester is selected from the group consisting of ethylene glycol dinitrate, diethylene glycol dinitrate, triethylene glycol dinitrate, 2-methyl-2 [(nitroxy)methyl]-1,3-propanediol dinitrate ester, butanetriol trinitrate 1,3, propanediol dinitrate, nitroglycerin, cellulose tri, di, and mononitrate and mixtures thereof.
Claim 20
Dependent Claim
26 words
The method of claim 15 wherein the amount of stabilizer present is between about 0.01 and about 5 percent of the weight of polynitrate ester present.
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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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |