Method of making jet fuel compositions via a dehydrocondensation reaction process

• US 5,189,232 A
• Filed: 06/27/1991
• Issued: 02/23/1993
• Est. Priority Date: 06/27/1991
• Status: Expired due to Term

• Current Assignee: University of Utah Research Foundation (State of Utah)
• Original Assignee: University of Utah (State of Utah)
• Inventors: Tsai, Chi H., Shabtai, Joseph S., Oblad, Alex G.
• Primary Examiner(s): MCFARLANE, ANTHONY R
• Application Number:
  US07/722,106
• Time in Patent Office: 607 Days
• Field of Search: 585/14, 585/721, 585/723, 585/730, 585/731
• US Class Current: 585/14
• CPC Class Codes: C10L 1/04 essentially based on blends of hydrocarbons

Abstract

A method of making jet fuel compositions from lower alkyl cyclopentanes and C₅ -C₈ olefins via a dehydrocondensation reaction in the presence of sulfuric acid or hydrofluoric acid. The reaction product contains a predominance of decalins and has high density, high heat of combustion and low freezing point.

Claims

1. A method of making jet fuel compositions having high density, high heat of combustion and low freezing point via a dehydrocondensation reaction comprising:

reacting a cyclopentane containing a lower alkyl group with a C₅ to C₈ olefin in the presence of concentrated sulfuric acid or HF at a temperature of about -10°

C. to about 50°

C. said alkyl group having one to three carbon atoms.

2. The method of claim 1 wherein the temperature of reaction is from about 0°

C. to about 40°

C.

3. The method of claim 1 wherein the temperature of reaction is from about 20°

C. to about 30°

C.

4. The method of claim 1 wherein the molar ratio of alkylcyclopentane reactant to olefin reactant is from about 0.5:

1 to about 20;

1.

5. The method of claim 1 wherein the molar ratio of cyclopentane reactant to olefinic reactant is from about 2:

1 to about 15;

1.

6. The method of claim 1 wherein the molar ratio of cyclopentane reactant to olefinic reactant is from about 3:

1 to about 10;

1.

7. The method of claim 1 wherein the alkyl group is methyl or ethyl.

8. The method of claim 1 wherein the C₅ -C₈ olefin is a C₅ -C₆ olefin.

9. The method of claim 8 wherein the olefin is cyclopentene or cyclohexene.

10. The method of claim 1 wherein said cyclopentane is dimethyl cyclopentane.

11. A jet fuel composition comprising:

decalins present as at least about 35% of the composition; and

alkylated single ring naphthenes present as at least about 4% of the composition.