System for extracting protein from a fermentation product

1. A system configured to process feedstock into a fermentation product and bioproducts including ethanol and meal, the system comprising:

a mill for processing the feedstock into a starch-containing component so that a slurry comprising the starch-containing component can be formed;

a vessel configured to contain the slurry and for fermentation of a fermentable component of the starch-containing component into the fermentation product, wherein the fermentation comprises liquefaction;

a distillation system that recovers ethanol from the fermentation product and separation of wet solids matter from the fermentation product to be dried into meal; and

an extraction system that extracts a bioproduct comprising a zein composition from the fermentation product wherein' the fermentation product comprises a protein component and the zein composition comprises at least a portion of the protein component of the fermentation product, wherein the zein composition comprises, by weight of zein in the zein composition, alpha zein in a percentage of at least 68 and beta zein and gamma zein in a combined percentage of at least 17 and no more than 25.9.

2. The system of claim 1 , wherein the meal comprises distillers grains and the system for extracting extracts the zein composition from the distillers grains.

3. The system of claim 1 , wherein the fermentation product comprises beer and the zein composition is extracted from the beer.

4. The system of claim 1 , wherein the fermentation product comprises a liquid component and a solids component and the zein composition is extracted from the solids component.

5. The system of claim 1 , wherein the wet solids matter comprises wet cake.

6. The system of claim 1 , wherein the extraction system further extracts the zein composition from the distillers meal by applying a solvent composition to the fermentation product and separating the fermentation product with the solvent composition.

7. The system of claim 6 , further comprising a separator supplied with the fermentation product and the solvent composition.

8. The system of claim 1 , wherein the fermentation product comprises fermentation solids and the system for extracting is configured to mill the fermentation solids and wherein the fermentation solids are supplied to a vessel and treated with a solvent composition.

9. The system of claim 8 , wherein the solvent composition comprises sodium hydroxide and treated fermentation solids that are separated into a liquid component and a treated solids component, the system further cpmprises a filtration system for separating the treated solids component wherein the filtration system comprises a micro filter is configured to retain matter having a particle size of 0.5 to 2 micrometers.

10. The system of claim 8 , wherein the solvent composition comprises sodium hydroxide and treated fermentation solids that are separated into a liquid component and a treated solids component the system further comprises a filtration system for separating the treated solids component wherein the filtration system comprises a membrane filter configured with a 10,000 molecular weight cutoff.

11. The system of claim 1 , further comprising a filtration system for producing a retentate supplied to a dryer and a permeate.

12. The system of claim 1 , wherein the extraction system extracts the bioproduct in a single step extraction.