Blown corn stillage oil

• US 8,765,985 B2
• Filed: 05/21/2010
• Issued: 07/01/2014
• Est. Priority Date: 05/22/2009
• Status: Active Grant

• Current Assignee: Cargill, Inc. (Agricultural Services Division)
• Original Assignee: Cargill, Inc. (Agricultural Services Division)
• Inventors: Hora, Michael John, Lochel, Frank P.
• Primary Examiner(s): Cutliff, Yate K
• Application Number:
  US13/321,768
• Publication Number:
  US 20120065417A1
• Time in Patent Office: 1,502 Days
• US Class Current: 554/183
• CPC Class Codes: C07C 29/76 by physical treatment
• CPC Class Codes: C08L 2555/34 Recycled or waste materials, e.g. reclaimed bitumen, asphalt, roads or pathways, recycled roof coverings or shingles, recycled aggregate, recycled tires, crumb rubber, glass or cullet, fly or fuel ash, or slag
• CPC Class Codes: C08L 2555/64 Oils, fats or waxes based upon fatty acid esters, e.g. fish oil, olive oil, lard, cocoa butter, bees wax or carnauba wax
• CPC Class Codes: C11B 3/02 by chemical reaction C11B3/003 takes precedence
• CPC Class Codes: C11B 3/08 with oxidising agents
• CPC Class Codes: C11B 3/14 with the use of indifferent gases or vapours, e.g. steam
• CPC Class Codes: C11C 3/006 by oxidation

Abstract

Blown corn stillage oils and methods for making blown corn stillage oils are disclosed. In one aspect the corn stillage oils are stripped to reduce the acid value of the resulting blown, stripped corn stillage oil. The method includes heating a corn stillage oil to a temperature of at least 90° C., and passing air through the heated oil to produce a blown corn stillage oil having a viscosity of at least 50 cSt at 40° C. In one aspect, the blown corn stillage oil is stripped to reduce the acid value of the blown, stripped corn stillage oil to 5 mg KOH/gram or less.

Claims

1. A method for producing a high viscosity, low volatiles blown-corn stillage oil, the method comprising the steps of:

(a) obtaining a corn stillage oil;

(b) heating the oil to at least 90°

C.;

(c) passing air through the heated oil to produce a blown-corn stillage oil having a viscosity of at least 50 cSt at 40°

C.; and

(d) stripping the blown-corn stillage oil to reduce the acid value of the blown-corn stillage oil to 5 mg KOH/g or less.

2. The method of claim 1, wherein the blown-corn stillage oil from step (d) exhibits a viscosity at 40°

C. of at least 60 cSt and a viscosity at 100°

C. of at least 11 cSt.

3. The method of claim 1 wherein the blown-corn stillage oil from step (c) exhibits a viscosity at 40°

C. of at least 55 cSt and a viscosity at 100°

C. of at least 11 cSt.

17. The method of claim 1 wherein the oil from step (d) has a pour point of −

13°

C. or less.

18. The method of claim 1, wherein the oil from step (d) has a pour point of −

14°

C. or less.

26. The method of any of claim 1, wherein a time required to pass air through the corn-stillage oil in step (c) to obtain a blown-corn stillage oil having a particular viscosity at 40°

C. is shorter than the time required to manufacture a blown soybean oil having equivalent viscosity under the same temperature and pressure conditions utilizing the same rate of passing air through the blown soybean oil as utilized for the blown corn stillage oil.

27. The method of claim 26, wherein the time required to obtain the blown-corn stillage oil is 25% less than the time to obtain the blown-soybean oil.

28. The method of claim 1, wherein air is sparged through the corn stillage oil in step (c) at a rate of from about 0.009 to 0.011 cubic feet per minute per pound oil.

4. A high viscosity, low volatiles blown, stripped corn stillage oil exhibiting:

a viscosity at 40°

C. of at least 60 cSt;

a viscosity at 100°

C. of at least 12 cSt;

an acid value of 4 mg KOH/gram or less;

a hydroxyl number of from about 10 to about 50; and

a flash point of at least 275°

C.

5. The oil of claim 4, wherein the oil exhibits a flash point of at least 290°

C.

6. A high viscosity, low volatiles blown, stripped corn stillage oil exhibiting:

a viscosity at 40°

C. of at least 700 cSt;

a viscosity at 100°

C. of at least 63 cSt;

an acid value of 3.5 mg KOH/gram or less;

a hydroxyl number of from about 10 to about 50; and

a flash point of at least 310°

C.

7. The oil of claim 6, wherein the oil exhibits:

a viscosity at 40°

C. of at least 730 cSt;

a viscosity at 100°

C. of at least 68 cSt;

an acid value of 3.0 mg KOH/gram or less; and

a flash point of at least 315°

C.

8. The oil of claim 6, wherein the oil exhibits a flash point of at least 320°

C.

9. The oil of claim 6, wherein the oil exhibits an acid value of 2.8 mg KOH/gram or less.

10. A method for producing a high viscosity, low volatiles blown-corn stillage oil, the method comprising the steps of:

(a) obtaining a corn stillage oil;

(b) heating the oil to at least 90°

C.;

(c) passing air through the heated oil to produce a blown-corn stillage oil; and

(d) stripping the blown-corn stillage oil to reduce the acid value of the blown-corn stillage oil to 3.5 mg KOH/gram or less,

wherein, the oil from step (d) has a flash point of at least 310°

C. and exhibits a viscosity of at least 680 cSt at 40°

C. and a viscosity of at least 63 cSt at 100°

C.

11. The method of claim 10, wherein the blown-corn stillage oil from step (c) has a viscosity of at least 650 cSt at 40°

C. and a viscosity of at least 60 cSt at 100°

C.

12. The method of claim 10, wherein the corn stillage oil from step (d) has a viscosity of at least 730 cSt at 40°

C. and a viscosity of at least 68 cSt at 100°

C.

13. The method of claim 10, wherein the oil from step (d) has a flash point of at least 315°

C.

14. The method of claim 10, wherein the oil from step (d) has a flash point of at least 320°

C.

15. The method of claim 10, wherein the oil from step (d) has an acid value of 3.0 mg KOH/gram or less.

16. The method of claim 10, wherein the oil from step (d) has an acid value of 2.8 mg KOH/gram or less.

29. The method of claim 10, wherein the blown-corn stillage oil from step (c) has a viscosity of at least 150 cSt at 40°

C.

30. The method of claim 10, wherein the blown-corn stillage oil from step (c) has a viscosity of at least 200 cSt at 40°

C.

19. A method for producing a high viscosity blown-corn stillage oil, the method comprising the steps of:

(a) obtaining a corn stillage oil;

(b) heating the oil to at least 105°

C.; and

(c) passing air through the heated oil to produce a blown-corn stillage oil having a viscosity of at least 50 cSt at 40°

C.

20. The method of claim 19, wherein the blown corn stillage oil has a viscosity of at least 60 cSt at 40°

C.

21. The method of claim 19, wherein the blown corn stillage oil has a viscosity of at least 130 cSt at 40°

C.

22. The method of claim 19, wherein the blown corn stillage oil has a viscosity of at least 5000 cSt at 40°

C.

23. The method of claim 19, wherein the corn stillage oil comprises from 8 percent by weight to 16 percent by weight free fatty acids and the blown-corn stillage oil has at most 20 relative percent more free fatty acids than the corn stillage oil of step (a).

24. The method of claim 19, wherein the blown-corn stillage oil has at most 10 relative percent more free fatty acids than the corn stillage oil of step (a).

25. The method of claim 19, wherein the blown-corn stillage oil has equivalent free fatty acids as the corn stillage oil of step (a).