High octane unleaded aviation gasoline

Patent metadata

Field	Value
Publication number	US-9388357-B2
Application number	US-201414340860-A
Country	US
Kind code	B2
Filing date	Jul 25, 2014
Priority date	Oct 31, 2013
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

High octane unleaded aviation fuel compositions having high aromatics content and a CHN content of at least 98 wt %, less than 2 wt % of oxygen content, an adjusted heat of combustion of at least 43.5 MJ/kg, a vapor pressure in the range of 38 to 49 kPa, freezing point is less than −58° C. is provided.

First claim

We claim:

1. An unleaded aviation fuel composition having a MON of at least 99.6, sulfur content of less than 0.05 wt %, CHN content of at least 98 wt %, less than 2 wt % of oxygen content, an adjusted heat of combustion of at least 43.5 MJ/kg, a vapor pressure in the range of 38 to 49 kPa, freezing point is less than −58° C. comprising a blend comprising:
from about 35 vol. % to about 55 vol. % of toluene having a MON of at least 107;
from about 4 vol. % to about 10 vol. % of aromatic amine component, wherein said aromatic amine component contains at least about 2 vol. % based on the fuel composition of toluidine;
from about 15 vol. % to about 40 vol. % of at least one alkylate or alkylate blend having an initial boiling range of from about 32° C. to about 60° C. and a final boiling range of from about 105° C. to about 140° C., having T40 of less than 99° C., T50 of less than 100° C., T90 of less than 110° C., the alkylate or alkylate blend comprising isoparaffins from 4 to 9 carbon atoms, about 3-20 vol. % of C5 isoparaffins, about 2-15 vol. % of C7 isoparaffins, and about 60-90 vol. % of C8 isoparaffins, based on the alkylate or alkylate blend, and less than 1 vol. % of C10+, based on the alkylate or alkylate blend; and
at least 14 vol. % of isopentane in an amount sufficient to reach a vapor pressure in the range of 38 to 49 kPa;

wherein the combined amount of toluene and aromatic amine component in the fuel composition is at least 40 vol. %; and
wherein the fuel composition contains less than 1 vol. % of C8 aromatics.

2. The unleaded aviation fuel composition of claim 1 wherein the final boiling point is less than 210° C.

3. The unleaded aviation fuel composition of claim 1 having T10 of at most 75° C., T40 of at least 75° C., a T50 of at most 105° C., a T90 of at most 135° C., a final boiling point of less than 210° C.

4. The unleaded aviation fuel composition of claim 1 further comprising from about 0.1 vol. % to about 10 vol. % of an alcohol having 4 to 8 carbon atoms.

5. The unleaded aviation fuel composition of claim 1 wherein the total isopentane content in the blend is 14% to 26 vol. %.

6. The unleaded aviation fuel composition of claim 1 having a potential gum of less than 6 mg/100 mL.

7. The unleaded aviation fuel composition of claim 1 wherein less than 0.2 vol. % of ethers are present.

8. The unleaded aviation fuel composition of claim 4 further comprising an aviation fuel additive.

9. The unleaded aviation fuel composition of claim 2 wherein the total isopentane content in the blend is 14% to 26 vol. %.

10. The unleaded aviation fuel composition of claim 1 wherein no noncyclic ether are present.

11. The unleaded aviation fuel composition of claim 1 wherein the final boiling point is at most 200° C.

12. The unleaded aviation fuel composition of claim 1 wherein the alkylate or alkylate blend have a C10+ content of less than 0.1 vol. % based on the alkylate or alkylate blend.

13. The unleaded aviation fuel composition of claim 1 wherein the aromatic amine component comprises toluidine and aniline.

14. The unleaded aviation fuel composition of claim 2 wherein the aromatic amine component comprise toluidine and aniline.

15. The unleaded aviation fuel composition of claim 1 having water reaction within +/−2 mL as defined in ASTM D1094.

16. The unleaded aviation fuel composition of claim 1 further comprising an alcohol having 4 to 8 carbon atoms having a boiling point in the range of 80° C. to 140° C.

17. The unleaded aviation fuel composition of claim 16 wherein the alcohol comprises an alcohol having 4 carbon atoms.

18. The unleaded aviation fuel composition of claim 16 wherein the alcohol comprises an alcohol having 8 carbon atoms.

Assignees

• Shell Oil Co

Inventors

• Shea Timothy Michael
• Davies Trevor James
• Macknay Michael Clifford
• Bennis Hanane Belmokaddem

Classifications

• C10L1/223

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

• C10L1/1824

  mono-hydroxy · CPC title

• C10L2200/0407

  Specifically defined hydrocarbon fractions as obtained from, e.g. a distillation column · CPC title

• C10L1/00 Primary

  Liquid carbonaceous fuels · CPC title

• C10L2270/04

  for turbines, planes, power generation · CPC title