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1. (WO2018226343) METHOD AND SYSTEM FOR SEPARATING ONE OR MORE AMINO ACIDS FROM A WHOLE STILLAGE BYPRODUCT PRODUCED IN A CORN DRY MILLING PROCESS
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What is claimed is:

1. A method for separating one or more amino acids from a whole stillage byproduct produced in a starch-containing grain dry milling process for making biofuel and/or a biochemical, the method comprising:

separating the whole stillage byproduct into an insoluble solids portion and a thin stillage portion, including protein, amino acids, and free oil;

separating the thin stillage portion into a water soluble solids portion, including the free oil, and a protein and amino acids portion, including the protein and the amino acids;

separating the protein and amino acids portion into a protein portion and an amino acids portion, which includes one or more of the amino acids; and

recovering the amino acids portion.

2. The method of claim 1, further comprising drying the separated amino acids portion to define an amino acid product.

3. The method of claim 1, further comprising drying the separated protein portion to define a protein product.

4. The method of claim 3, wherein the protein product is a high protein corn meal that includes at least 40 wt % protein on a dry basis.

5. The method of claim 1, wherein separating the protein and amino acids portion into a protein portion and an amino acids portion comprises separating the protein and amino acids portion via membrane filtration, electrophoresis, ion adsorption, or a combination thereof.

6. The method of claim 1, wherein separating the protein and amino acids portion into a protein portion and an amino acids portion comprises separating the protein and amino acids portion via a microfiltration membrane, an ultrafiltration membrane, or a combination thereof.

7. The method of claim 1, further comprising, prior to separating the protein and amino acids portion into a protein portion and an amino acids portion, chemically processing the protein and amino acids portion to aid the separation of the amino acids portion from the protein portion.

8. The method of claim 7, wherein chemically processing the protein and amino acids portion includes adding one of a strong acid, an alkaline solution, an alcohol, or a catalyst to the protein and amino acids portion.

9. The method of claim 1, further comprising stabilizing the separated amino acids portion.

10. The method of claim 9, wherein stabilizing the separated amino acids portion includes adding a stabilizer that includes a salt, a carbohydrate, cellulose, a dextrin component, or a combination thereof to the separated amino acids portion.

11. The method of claim 1, further comprising, prior to separating the protein and amino acids portion into the protein portion and the amino acids portion, dewatering the separated protein and amino acids portion.

12. The method of claim 1, further comprising dewatering the separated protein portion.

13. The method of claim 1, further comprising, after separating the whole stillage byproduct into an insoluble solids portion and a thin stillage portion and before separating the thin stillage portion into a protein portion and a water soluble solids portion, separating fine fiber from the thin stillage portion.

14. The method of claim 13, wherein separating fine fiber from the thin stillage portion comprises separating the fine fiber via a pressure screen, paddle screen, decanter, or filtration centrifuge.

15. The method of claim 1, further comprising separating soluble solids from the water soluble solids portion to provide a soluble solids portion.

16. The method of claim 1, further comprising separating the free oil from the water soluble solids portion to provide an oil portion.

17. The method of claim 1, further comprising processing the separated amino acids to be used as or in animal feed or human food applications.

18. The method of claim 1, wherein the amino acids portion includes one or more of lysine, methionine, cysteine, threonine, tryptophan, valine, isoleucine, or leucine.

19. A system for separating one or more amino acids from a whole stillage byproduct produced in a starch-containing grain dry milling process for making biofuel and/or a biochemical, the system comprising:

a first apparatus that receives the whole stillage byproduct and separates the whole stillage byproduct into an insoluble solids portion and a thin stillage portion, including protein, amino acids, and free oil;

a second apparatus that is situated after the first apparatus, the second apparatus receives the thin stillage and separates the thin stillage portion into a water soluble solids portion, including the free oil, and a protein and amino acids portion, including the protein and the amino acids; and

a third apparatus that is situated after the second apparatus, the third apparatus receives the protein and amino acids portion and separates the protein and amino acids portion into a protein portion and an amino acids portion, which includes one or more of the amino acids.

20. The system of claim 19, further comprising a drying apparatus that is situated after the third apparatus and that dries the amino acids portion received from the third apparatus to define an amino acid product.

21. The system of claim 19, wherein the protein portion defines a high protein corn meal that includes at least 40 wt % protein on a dry basis.

22. The system of claim 19, wherein the first apparatus is selected from a filtration centrifuge, a pressure screen, or a paddle screen and the second apparatus is selected from a nozzle centrifuge or a cyclone apparatus.

23. The system of claim 19, wherein the third apparatus is configured to separate the protein and amino acids portion via membrane filtration, electrophoresis, ion adsorption, or a combination thereof.

24. The system of claim 19, wherein the third apparatus is selected from a microfiltration membrane, an ultrafiltration membrane, or a combination thereof.

25. The system of claim 19, further comprising a dewatering apparatus that is situated after the second apparatus to dewater the protein and amino acids portion or that is situated after the third apparatus to dewater the protein portion.

26. The system of claim 18, further comprising an oil recovery centrifuge to separate the free oil from the water soluble solids portion to provide an oil portion.

27. The system of claim 19, further comprising a drying apparatus that is situated after the third apparatus and that dries the protein portion received from the third apparatus to define a protein product.

28. A system for separating one or more amino acids from a whole stillage byproduct produced in a starch-containing grain dry milling process for making biofuel and/or a biochemical, the system comprising:

a first apparatus that receives the whole stillage byproduct and separates the whole stillage byproduct into an insoluble solids portion and a thin stillage portion, including protein, amino acids, and free oil;

a second apparatus that is situated after the first apparatus, the second apparatus receives the thin stillage and separates the thin stillage portion into a water soluble solids portion, including the free oil, and a protein and amino acids portion, including the protein and the amino acids;

a chemical processing system that is situated after the second apparatus, the chemical processing system receives and chemically processes the protein and amino acids portion to aid in separation of the protein and amino acids portion; and

a third apparatus that is situated after the chemical processing system, the third apparatus receives the chemically processed protein and amino acids portion and separates the protein and amino acids portion into a protein portion and an amino acids portion, which includes one or more of the amino acids.