# US 8,771,385 B2 · Fuel compositions

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- Number: US 8,771,385 B2
- Document ID: US8771385B2
- Status: Granted
- Kind: B2
- Application number: 13/142,315
- Filed: 2009-12-28
- Published: 2012-04-19
- Granted: 2014-07-08
- Earliest claimed: 2008-12-29
- Assignees: Shell Oil Company
- Applicants: Claire Griffins; Richard Hugh Clark; Christopher William Clayton; Paul Anthony Stevenson; Robert Wilfred Matthews Wardle
- Inventors: Claire Griffins; Richard Hugh Clark; Christopher William Clayton; Paul Anthony Stevenson; Robert Wilfred Matthews Wardle
- Web page: https://patentgrep.com/patent/US8771385B2

## CPC

- C10L 1/08: for compression ignition
- C10G 2/30: {from carbon monoxide with hydrogen}
- C10L 1/026: {for compression ignition}
- C10L 1/1852: {Ethers; Acetals; Ketals; Orthoesters}
- C10L 1/223: having at least one amino group bound to an aromatic carbon atom {(C10L1/221, C10L1/2227 take precedence)}
- C10L 10/12: for improving the cetane number
- C10G 2300/307: Cetane number, cetane index
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES

## Abstract

Use in a gas oil fuel composition, which preferably comprises a Fischer-Tropsch derived fuel, of a compound according to formula (I): wherein: R1 to R5 are each independently hydrogen or a C1-10 alkyl group, where such alkyl groups may be the same as or different from one another; X is a nitrogen- or oxygen-containing group, for the purpose of reducing the cetane number of said fuel composition; preparation of such a fuel composition; and operating a fuel consuming system.

## Claims

### Claim 1

A gas oil fuel composition comprising at least one base fuel, at least one Fischer-Tropsch derived fuel and a compound according to formula (I):
wherein each of R1-R5 is a C1-3 alkyl group; and
X is a nitrogen-containing group.

### Claim 2

A method of reducing the cetane number of a gas oil fuel composition, said fuel composition comprising at least one Fischer-Tropsch derived fuel, said method comprising adding a compound according to formula (I):
wherein each of R1-R5 is a C1-3 alkyl group; and
X is a nitrogen-containing group,
to said fuel composition.

### Claim 3

A process for the preparation of a gas oil fuel composition, said fuel composition comprising at least one base fuel at least one Fischer-Tropsch derived fuel, which process comprises blending a compound according to formula (I):
wherein each of R1-R5 is a C1-3 alkyl group; and
X is a nitrogen-containing group,
and at least one fuel component.

### Claim 4

A method of operating a fuel consuming system, which method comprises reducing the cetane number of a gas oil fuel composition by adding a compound according to formula (I):
wherein each of R1-R5 is a C1-3 alkyl group; and
X is a nitrogen-containing group,
to said fuel composition, and then introducing into the system said fuel composition.

### Claim 5 (depends on 1)

The composition of claim 1 wherein said at least one base fuel comprises a diesel base fuel.

### Claim 6 (depends on 1)

The composition of claim 1, wherein said Fischer-Tropsch derived fuel is a gas oil, kerosene or naphtha.

### Claim 7 (depends on 1)

The composition of claim 1, wherein the fuel composition includes at least 1 wt. % of the compound according to formula I.

### Claim 8 (depends on 1)

The composition of claim 1, wherein the fuel composition includes up to 5 wt. % of the compound according to formula I.

### Claim 9 (depends on 1)

The composition of claim 1, wherein the fuel composition comprises up to 25 wt. % of the Fischer-Tropsch derived fuel.

### Claim 10 (depends on 1)

The composition of claim 1, wherein the fuel composition comprises at least 10 wt. % of the Fischer-Tropsch derived fuel.