Patent US2722135A successfully refreshed from Google Patents.
Patent US5807413A successfully refreshed from Google Patents.
US5807413A
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US
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Synthetic diesel fuel with reduced particulate matter emissions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1996-08-02
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Granted: 1998-09-15
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Expires: 2016-08-02
Abstract
Abstract A diesel engine fuel is produced from Fischer-Tropsch wax by separating a light density fraction, e.g., C5-C15, preferably C7-C14 cut having at least 80+ wt % n-paraffins, no more than 5000 ppm alcohols as oxygen, less than 10 wt % olefins, twice aromatics and very low sulfur and nitrogen.
Inventors
- 👤 Robert Jay Wittenbrink
- 👤 Richard Frank Bauman
- 👤 Daniel Francis Ryan
- 👤 Paul Joseph Berlowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:58
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/04; C10L1/08; C10G; C10G2/00; C10G2/30; C10G2/32; C10G2/33; C10G2/331; C10G2/332
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
54 words
A fuel useful for combustion in fuel diesel engines comprising: predominantly C 5 -C 15 paraffin hydrocarbons of which at least about 80 wt % are n-paraffins, no more than 5000 wppm alcohols as oxygen ≦10 wt % olefins ≦0.05 wt % aromatics <0.001 wt % S <0.001 wt % N cetane number ≧60.
Claim 2
Dependent Claim
54 words
A fuel useful for combustion in fuel diesel engines comprising: predominantly C 5 -C 15 paraffin hydrocarbons of which at least about 80 wt % are n-paraffins, no more than 5000 wppm alcohols as oxygen ≦10 wt % olefins ≦0.05 wt % aromatics <0.001 wt % S <0.001 wt % N cetane number ≧60.
Claim 3
Dependent Claim
30 words
The fuel of claim 1 wherein the initial boiling point of the fuel ranges from about 90°-215° F. and the 90% off boiling point ranges from about 480° F.-600° F.
Claim 4
Dependent Claim
16 words
The fuel of claim 1 wherein the paraffin hydrocarbons are at least 90 wt % n-paraffins.
Claim 5
Dependent Claim
14 words
The fuel of claim 1 wherein the alcohol content ranges 500-5000 wppm as oxygen.
Claim 6
Dependent Claim
13 words
The fuel of claim 1 wherein the olefin content is ≦5 wt %.
Claim 7
Dependent Claim
13 words
The fuel of claim 5 wherein the olefin content is ≦2 wt %.
Claim 8
Dependent Claim
13 words
The fuel of claim 5 wherein the cetane number is greater than 65.
Claim 9
Dependent Claim
16 words
The fuel of claim 7 derived from a Fischer-Tropsch process utilizing a Group VIII metal catalyst.
Claim 10
Dependent Claim
23 words
The fuel of claim 8 wherein the Fischer-Tropsch process is essentially non-shifting wherein the Fischer-Tropsch catalyst comprises cobalt or ruthenium or mixtures thereof.
Claim 11
Dependent Claim
11 words
The fuel of claim 9 wherein the Fischer-Tropsch catalyst comprises cobalt.
Claim 12
Dependent Claim
17 words
The fuel of claim 5 wherein the carbon number range is predominantly C 7 -C 14 .
Claim 13
Dependent Claim
24 words
The fuel of claim 10 wherein the initial boiling point is about 180°-200° F. and the 90% boiling point ranges from about 480°-520° F.
Claim 14
Dependent Claim
74 words
A process for producing a diesel engine fuel comprising paraffinic hydrocarbons having low particulate emissions after combustion which comprises reacting, under Fischer-Tropsch reaction conditions, hydrogen and carbon monoxide synthesis gases in the presence of a Fischer-Tropsch Group VIII metal catalyst, recovering from the reaction a light fraction product nominally comprising a 700° F.-material, and recovering from the light product a fuel predominantly comprising C 5 -C 15 paraffin hydrocarbons as described in claim 1.
Claim 15
Dependent Claim
11 words
The process of claim 13 wherein the Fischer-Tropsch catalyst comprises cobalt.
Claim 16
Dependent Claim
19 words
The process of claim 13 wherein the Fischer-Tropsch catalyst is non-shifting and comprises cobalt or ruthenium or mixtures thereof.
Claim 17
Dependent Claim
30 words
The process of claim 14 wherein a nominal C 5 -500° F. fraction is further recovered from the light product, and from which the fuel of claim 1 is recovered.
References Cited (Backward Citations)
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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) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |