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Value added whole stillage by-products from an ethanol production process

  • US 8,735,544 B1
  • Filed: 09/28/2005
  • Issued: 05/27/2014
  • Est. Priority Date: 01/13/1999
  • Status: Active Grant
First Claim
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1. A process for producing a zein protein containing product comprising:

  • a) hydrolyzing and fermenting a carbohydrate containing feedstock to produce an ethanol containing product stream;

    b) distilling the ethanol containing product stream to produce an ethanol containing product and a separated whole stillage;

    c) filtering the separated whole stillage through an ultrafiltration membrane sized and configured to have a molecular weight cut-off between about 10,000 to about 50,000 molecular weight cut-off to form a zein protein containing retentate and a permeate stream; and

    d) drying the zein protein containing retentate to form a zein protein containing product having a water content of less than about 12% by weight.

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