High octane unleaded aviation gasoline

Patent metadata

Field	Value
Publication number	US-9388356-B2
Application number	US-201414340830-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 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 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, comprising a blend comprising:
from about 35 vol. % to about 55 vol. % of toluene having a MON of at least 107;
from about 2 vol. % to about 10 vol. % of aniline;
from about 15 vol. % to about 30 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 3-15 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;
from about 4 vol. % to less than 10 vol. % of a branched chain alcohol having 8 carbon atoms provided that the branched chain does not include t-butyl groups; and
at least 8 vol. % of isopentane in an amount sufficient to reach a vapor pressure in the range of 38 to 49 kPa;

wherein the fuel composition contains less than 1 vol. % of C8 aromatics.

2. The unleaded aviation fuel composition of claim 1 wherein the total isopentane content in the blend of 10 vol. % to 26 vol. %.

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

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

5. The unleaded aviation fuel composition of claim 2 further comprising an aviation fuel additive.

6. The unleaded aviation fuel composition of claim 1 having a freezing point of less than −58° C.

7. The unleaded aviation fuel composition of claim 1 wherein no straight chain alcohol and no noncyclic ether are present.

8. The unleaded aviation fuel composition of claim 1 having a final boiling point of less than 190° C.

9. 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.

10. The unleaded aviation fuel composition of claim 1 wherein the branched chain alcohol is 2-ethyl hexanol.

11. The unleaded aviation fuel composition of claim 8 having the final boiling point of at most 180° C.

12. The unleaded aviation fuel composition of claim 1 wherein T10 is at most 75° C.

Assignees

• Shell Oil Co

Inventors

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

Classifications

• C10L1/10 Primary

  containing additives · CPC title

• C10L1/18

  containing oxygen · CPC title

• C10L1/1608

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

• C10L2200/0423

  Gasoline · CPC title

• C10L1/22

  containing nitrogen · CPC title