Corn stillage oil derivatives
Corn stillage oil derivatives having values for Gardner color of 10 or less and methods for making the corn stillage oil derivatives are disclosed. In one aspect, the corn stillage oil derivative comprises a heat bleached corn stillage oil. Preferably, the heat bleached corn stillage oil has a value for Gardner color of from 4 to 8. In another aspect, the corn stillage oil derivative comprises a blown corn stillage oil. Preferably, the blown corn stillage oil has a value for Gardner color of from 5 to 8.
1. A method for producing a blown corn stillage oil, the method comprising:
(a) obtaining a corn stillage oil having a viscosity of from 25 to 35 cSt at 40° C.;
(b) heating the corn stillage oil to at least 90° C. for a sufficient period of time to obtain a corn stillage oil derivative; and
(c) passing air through the corn stillage oil derivative to produce a blown corn stillage oil.
2. The method of claim 1 , wherein the blown corn stillage oil has a viscosity of at least 50 cSt at 40° C.
3. The method of claim 1 , wherein the blown corn stillage oil exhibits a viscosity at 100° C. of at least 8 cSt.
4. The method of claim 1 , wherein the blown corn stillage oil has a viscosity less than 250 cSt at 40° C.
5. The method of claim 1 , wherein the blown corn stillage oil has a Gardner color of 5 to 8.
6. The method of claim 1 , wherein step (c) comprises passing air through the corn stillage oil derivative for from 3 hours to 12 hours.
7. The method of claim 1 , wherein the corn stillage oil of step (a) comprises from 9 wt % to 15 wt % free fatty acids.
8. The method of claim 7 , wherein the blown corn stillage oil has at most 10 relevant percent more free fatty acids than the corn stillage oil of step (a).
9. A method for producing a blown-corn stillage oil, the method comprising:
(a) obtaining a vacuum distilled corn stillage oil having a viscosity of from 25 to 35 cSt at 40° C.;
(b) heating the corn stillage oil to at least 90° C. for a sufficient period of time to obtain a corn stillage oil derivative; and
(c) passing air through the corn stillage oil derivative to produce a blown corn stillage oil.
10. The method of claim 9 , wherein the blown corn stillage oil has a viscosity of at least 50 cSt at 40° C.
11. The method of claim 9 , wherein the blown corn stillage oil exhibits a viscosity at 100° C. of at least 8 cSt.
12. The method of claim 9 , wherein the blown corn stillage oil has a viscosity less than 250 cSt at 40° C.
13. The method of claim 9 , wherein the blown corn stillage oil has a Gardner color of 5 to 8.
14. The method of claim 9 , wherein step (c) comprises passing air through the corn stillage oil derivative for from 3 hours to 12 hours.
15. The method of claim 9 , wherein the corn stillage oil comprises from 9 wt % to 15 wt % free fatty acids.
16. The method of claim 15 , wherein the blown corn stillage oil has at most 10 relevant percent more free fatty acids than the corn stillage oil.
17. A method for producing a blown-corn stillage oil, the method comprising:
(a) obtaining a corn stillage oil having a Gardner color of at least 12;
(b) heating the corn stillage oil to at least 90° C. for a sufficient period of time to obtain a corn stillage oil derivative; and
(c) passing air through the corn stillage oil derivative to produce a blown-corn stillage oil having a Gardner color of from 5 to 8.
18. The method of claim 17 , wherein the blown corn stillage oil has a viscosity of at least 50 cSt at 40° C.
19. The method of claim 17 , wherein the corn stillage oil is vacuum distilled corn stillage oil.
20. The method of claim 17 , wherein the corn stillage oil is pressure distilled corn stillage oil.