Method of and system for producing oil and valuable byproducts from grains in dry milling systems with a back-end dewater milling unit
A method of and system for producing oil and valuable byproducts from grains, such as corn, in dry mills are disclosed. The method and system include dewater milling process after fermenting. Further, the method and system are able to produce oil without evaporating. Moreover, the method and system include one or more of the germ processing units, emulsion processing units, fiber processing units, high value protein producing units, and glycerol and inorganic salt producing units, such that high value byproducts are able to be generated.
1. A method of producing oil using a dry milling system comprising:
a) separating a whole stillage into a solid portion and a liquid portion after fermenting; and
b) grinding the solid portion after the separating to release a first oil from germs and release the starch from grit in kernels of grains; and
c) separating a second oil and protein in the liquid portion.
2. The method of claim 1 , wherein the grinding comprises dewater milling.
3. The method of claim 2 , wherein the first oil is recovered at oil recovering after fermenting.
4. The method of claim 1 , wherein the liquid portion contains the protein, the second oil and a soluble solid.
5. The method of claim 1 , wherein the separating the second oil and the protein separates the liquid portion into an oily part and a protein part.
6. The method of claim 5 , further comprising protein dewatering generating protein meal from the protein part.
7. The method of claim 5 , further comprising fiber and protein dewatering generating DDG from the protein part.
8. The method of claim 7 further comprising recycling the overflow from the fiber/protein dewatering as part of a back-set fluid.
9. The method of claim 5 , further comprising recovering the second oil from the oily part from the oil and protein separating.
10. The method of claim 9 , wherein the recovering oil is performed without evaporating.
11. The method of claim 9 , wherein the recovering oil is performed before evaporating.
12. The method of claim 9 , further comprising generating syrup having dry solid higher than 60%.
13. The method of claim 1 , wherein the grains comprises corn.
14. The method of claim 1 , wherein the first or the second oil comprises corn oil.