Oil composition and method of recovering same
The present invention generally relates to oil compositions and methods of producing such oil compositions. More particularly, the present invention relates to an oil composition recovered from a fermentation product as well as methods of recovering such oil compositions for use in various processes such as bio-diesel production as well as in various edible applications.
1. A method of recovering an oil composition comprising the steps of:
fermenting a starch composition to form a fermented product comprising an oil fraction and a first aqueous portion;
removing moisture from the fermented product to form a concentrated fermented product;
separating the concentrated fermented product into an oil fraction emulsion phase and a first aqueous portion by applying a first centrifugal force, wherein the oil fraction emulsion phase comprises the oil composition and includes 20 to 70% oil and wherein the first aqueous portion includes up to 10% oil;
treating the oil fraction emulsion phase to separate the oil composition from the emulsion forming a mixture;
separating the mixture into the oil composition and a second aqueous portion by applying a second centrifugal force, wherein the oil composition includes 80 to 100% oil and wherein the second aqueous portion includes 50% or less oil; and
recovering the oil composition.
2. The method of claim 1 , wherein the oil fraction emulsion phase comprises from 10% to 60% moisture w/w based on the total weight of the separated oil fraction emulsion phase.
3. The method of claim 1 , wherein the oil composition comprises no greater than about 2% moisture w/w and a free fatty acid content of no greater than 15% w/w based on the total weight of the oil composition.
4. The method of claim 1 , wherein the treating is a pH adjustment to a range of about 3 to about 7.
5. The method of claim 4 , wherein the pH is adjusted to a range of about 3.5 to about 6.
6. The method of claim 1 , wherein the treating is adjusting pH by adding a base.
7. The method of claim 6 , wherein the base comprise an organic base or inorganic base.
8. The method of claim 7 , wherein the inorganic base comprises monovalent hydroxide base comprising a metal from Group I.
9. The method of claim 8 , wherein the inorganic base comprises KOH or NaOH.
10. The method of claim 7 , wherein the organic base comprise ammonia or urea.
11. The method of claim 6 , wherein the pH is adjusted to a range of about 7 to about 10.
12. The method of claim 11 , wherein the pH is adjusted to a range of about 7.5 to about 8.5.
13. The method of claim 12 , wherein the oil composition comprises a free fatty acid content of no greater than 15% w/w based on the total weight of the oil composition.
14. The method of claim 13 , wherein the free fatty acid content is no greater than 5% w/w based on the total weight of the oil composition.
15. The method of claim 14 , wherein the free fatty acid content is no greater than 2% w/w based on the total weight of the oil composition.
16. The method of claim 11 , wherein the pH is adjusted to a range of about 8 to about 10.
17. The method of claim 16 further comprising recovering soap from the oil composition.
18. The method of claim 1 further comprising degumming the oil composition.
19. The method of claim 18 further comprising clay bleaching, heat bleaching, transesterifying, or a combination of two or more thereof.
20. The method of claim 1 further comprising cooking the starch composition or adding an enzyme composition before forming the fermented product.
21. The method of claim 1 , wherein the starch composition is not cooked before providing forming the fermented product.
22. The method of claim 1 , wherein the fermented product has a moisture content of 60% to 95%.
23. The method of claim 1 , wherein the concentrated fermented product is a syrup.