Fuels as solvents for the conduct of enzymatic reactions

• US 5,697,986 A
• Filed: 04/12/1996
• Issued: 12/16/1997
• Est. Priority Date: 04/12/1996
• Status: Expired due to Fees

• Current Assignee: United States Department Of Health And Human Services
• Original Assignee: United States Department Of Agriculture
• Inventors: Haas, Michael J.
• Primary Examiner(s): Johnson, Jerry D.
• Application Number:
  US08/631,497
• Time in Patent Office: 613 Days
• Field of Search: 44/307, 44/308, 44/376, 44/377, 44/386, 44/388
• US Class Current: 44/308
• CPC Class Codes: C10L 1/00 Liquid carbonaceous fuels

Abstract

The present invention describes a method of producing biofuels by carrying out the enzymatic transesterification of fatty acid-containing materials directly in automotive fuels.

Claims

1. A method for producing biofuel, said method comprising

a) forming a reaction mixture of automotive or related fuel, fatty acid-containing substances, alcohol and lipase, all in amounts effective for a reaction to occur, and water in an amount sufficient to confer enzymatic activity,

b) incubating the reaction mixture for a time and at a temperature sufficient for transesterification between the fatty acid-containing substance and the alcohol to occur,

c) separating the by-products from the biofuel portion of the mixture.

2. The method of claim 1, wherein said fatty acid-containing substances are triglycerides, phospholipids, fatty acid esters, or esters which are substrates for the lipase.

3. The method of claim 2, wherein said fatty acid-containing substances are triglycerides or phospholipids.

4. The method of claim 1, wherein said alcohol is normal-, iso- or cyclo-series of alkyl alcohol.

5. The method of claim 4, wherein said alcohol is ethanol, propanol, isopropanol, 1-butanol, 2-butanol or isobutanol.

6. The method of claim 1, wherein said lipase is any lipase produced by plants, bacteria, fungi or higher eukaryotes.

7. The method of claim 1, wherein said automotive fuel is diesel fuel or gasoline.

8. The method of claim 1, wherein said incubation temperature is from about room temperature to about 60°

C.