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Patexia Research

Patent 08008516 - Method of processing ethanol byproducts and related subsystems > Claims

  • 1. A method of recovering oil from thin stillage; the method consisting essentially of, in sequence:nevaporating water from the thin stillage to form a thin stillage concentrate, wherein the thin stillage concentrate has a moisture content of greater than 30% and less than 90% by weight before the recovering step;mechanically processing the thin stillage concentrate to separate oil from the thin stillage concentrate; andrecovering the separated oil.
    • 2. The method of claim 1, wherein the thin stillage concentrate has a moisture content of greater than 60% and less than 85% by weight before the recovering step.
    • 3. The method of claim 1, wherein the thin stillage concentrate has a pH of between about 3 and 6.
    • 4. The method of claim 1, wherein the thin stillage concentrate has a pH of between about 3.5 and 4.5.
    • 5. The method of claim 1, wherein mechanically processing further comprises heating the thin stillage concentrate to a temperature between 150° F. and 212° F.
    • 6. The method of claim 1, wherein mechanically processing further comprises heating the thin stillage concentrate to a temperature between 150° F. and 212° F. and a pH between 3 and 6.
    • 11. The method of recovering oil from thin stillage of claim 1, wherein mechanically processing comprises disc stack centrifuging the thin stillage concentrate.
  • 7. A method of processing whole stillage, comprising, in sequence:nseparating distiller wet grains and thin stillage from the whole stillage, the thin stillage including oil and solids;concentrating the thin stillage including the solids to form a concentrate having a moisture content of greater than 30% and less than 90% by weight; anddisc stack centrifuging oil from the thin stillage concentrate to form a substantially oil free concentrate.
    • 8. The method of claim 7, wherein the concentrating step comprises processing the thin stillage a pH of between about 3 and 6, and a moisture content of less than 90%.
    • 9. The method of claim 7, wherein the recovering and concentrating steps are performed in a continuous fashion.
    • 10. The method of claim 7, further including the step of drying the concentrate after the step of recovering the oil.
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