Unleaded aviation fuel

Patent metadata

Field	Value
Publication number	US-10246659-B2
Application number	US-201715688000-A
Country	US
Kind code	B2
Filing date	Aug 28, 2017
Priority date	Aug 28, 2017
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

The present invention relates to an aviation gasoline composition, its production and its use in a reciprocating spark ignition aircraft engine.

First claim

The invention claimed is:

1. A lead-free aviation gasoline composition having a high motor octane number and low freezing temperature, the gasoline comprising:
(a) about forty-five percent (45%) to about sixty-five percent (65%) by weight of at least one unleaded gasoline base fuel having a motor octane number of between ninety-seven (97) and ninety-nine point nine (99.9);
(b) about ten percent (10%) to about thirty-five percent (35%) by weight of one or more alkylated benzenes;
(c) about six percent (6%) to about twelve percent (12%) by weight, collectively, of one or more of iso-pentane, n-butane, and iso-butane; and
(d) about four percent (4%) to about fifteen percent (15%) by weight aromatic-amines, said aromatic amines comprising N-methyl-p-toluidine in combination with at least one of N-methyl-m-toluidine and m-Toluidine, and a ratio of N-methyl-p-toluidine to the at least one of N-methyl-m-toluidine and m-Toluidine is about four to one (4:1) to twelve to one (12:1);
wherein the gasoline has a freezing point of −58° C. or lower.

2. The aviation gasoline as set forth in claim 1 , wherein the ratio is about four to one (4:1) to nine to one (9:1), by weight.

3. The aviation gasoline (a) as set forth in claim 1 , wherein the gasoline comprises about six percent (6%) to about fifteen percent (15%) by weight of the aromatic amines.

4. The aviation gasoline as set forth in claim 1 , wherein the aromatic amines further comprise N,N-dimethylated-p-toluidine.

5. The aviation gasoline as set forth in claim 4 , wherein the amount of N,N-dimethylated-p-toluidine does not exceed 5 wt. % of the aromatic amines.

6. The aviation gasoline as set forth in claim 1 , wherein the unleaded gasoline base fuel has a motor octane number of about ninety-eight (98).

7. A method for manufacture of the aviation fuel composition according to claim 1 , the method comprising blending together components (a), (b), (c), and (d).

8. A method for operating a spark ignition aircraft engine, the method comprising introducing the aviation gasoline composition according to claim 1 into a spark ignition aircraft engine and combusting the gasoline in the engine.

9. The aviation gasoline as set forth in claim 1 , wherein component (d) comprises about four percent (4%) to about fifteen percent (15%) by weight of N-methyl-p-toluidine in combination with both N-methyl-m-toluidine and m-toluidine.

10. The aviation gasoline as set forth in claim 1 , wherein component (d) comprises about four percent (4%) to about fifteen percent (15%) by weight of N-methyl-p-toluidine in combination with N-methyl-m-toluidine.

11. The aviation gasoline as set forth in claim 9 , wherein the ratio of N-methyl-p-toluidine to N-methyl-m-toluidine is 8:1 to 9:1.

12. The aviation gasoline as set forth in claim 1 , wherein component (d) comprises about four percent (4%) to about fifteen percent (15%) by weight of N-methyl-p-toluidine in combination with m-Toluidine.

13. The aviation gasoline as set forth in claim 12 , wherein the ratio of N-methyl-p-toluidine to m-toluidine is 4:1.

14. The aviation gasoline as set forth in claim 1 , wherein the alkylated benzenes comprise mono- di- or trialkylated benzenes, and the gasoline comprises about fifteen percent (15%) to about thirty percent (30%) by weight of the alkylated benzenes.

15. The aviation gasoline as set forth in claim 14 , wherein the alkylated benzenes are selected from the group consisting of xylenes, ethyl benzene, toluene, and 1,3,5-trimethylbenzene, and mixtures thereof.

16. The aviation gasoline as set forth in claim 15 , wherein:
component (a) has a motor octane number of 88 to 99.9;
component (b) is m-xylene or 1,3,5-trimethylbenzene or a mixture thereof; and
component (c) is isopentane.

17. The aviation gasoline as set forth in claim 16 , wherein the gasoline comprises about six percent (6%) to about fifteen percent (15%) by weight of component (d), and 0.01 wt % to 5 wt % of component (d) is N,N-dimethylated-p-toluidine.

18. The aviation gasoline as set forth in claim 17 , wherein component (d) comprises N-methyl-p-toluidine in combination with both N-methyl-m-toluidine and m-toluidine.

19. The aviation gasoline as set forth in claim 17 , wherein component (d) comprises N-methyl-p-toluidine in combination with N-methyl-m-toluidine.

20. The aviation gasoline as set forth in claim 17 , wherein component (d) comprises N-methyl-p-toluidine in combination with m-Toluidine.

Assignees

• Lanxess Deutschland Gmbh

Inventors

• Henseler Alexander
• Hauschild Torsten

Classifications

• C10L1/1608

  Well defined compounds, e.g. hexane, benzene · CPC title

• C10L1/223 Primary

  having at least one amino group bound to an aromatic carbon atom {(C10L1/221, C10L1/2227 take precedence)} · CPC title

• C10L1/06

  for spark ignition · CPC title

• C10L2270/04

  for turbines, planes, power generation · CPC title

• C10L10/10

  for improving the octane number · CPC title