PROCESS FOR PRODUCING ETHANOL FROM CORN DRY MILLING
First Claim
1. A process for upgrading the unfermented fraction of corn from a yeast fermentation based corn dry milling ethanol process, comprising:
- a. hydrolyzing an unfermented fraction of corn from a yeast fermentation based corn dry milling ethanol process;
b. separating the hydrolyzed unfermented fraction into a solids fraction and a liquid hydrolyzate;
c. culturing a microorganism in the liquid hydrolyzate; and
d. wherein the solids fraction has an increased protein content compared to the unfermented fraction.
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Abstract
A process for producing ethanol by the conversion of carbohydrates from a corn dry milling process in which the bottoms fraction from distillation of ethanol in a conventional yeast fermentation is used in a process including a combination of biochemical and synthetic conversions. The process results in high yield ethanol production with concurrent production of high value coproducts. An acetic acid intermediate is produced from bottoms fraction, followed by conversion of the acetic acid into ethanol using esterification and hydrogenation reactions. Coproducts of the process include a high protein content solids fraction produced in the fermentation.
240 Citations
22 Claims
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1. A process for upgrading the unfermented fraction of corn from a yeast fermentation based corn dry milling ethanol process, comprising:
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a. hydrolyzing an unfermented fraction of corn from a yeast fermentation based corn dry milling ethanol process; b. separating the hydrolyzed unfermented fraction into a solids fraction and a liquid hydrolyzate; c. culturing a microorganism in the liquid hydrolyzate; and d. wherein the solids fraction has an increased protein content compared to the unfermented fraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A process for upgrading the unfermented fraction of corn from a yeast fermentation based corn dry milling ethanol process, comprising:
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a. hydrolyzing an unfermented fraction of corn from a yeast fermentation based corn dry milling ethanol process, wherein the step of hydrolyzing comprises enzymatic hydrolysis; b. separating the hydrolyzed unfermented fraction into a solids fraction, comprising at least about 35% protein on a dry weight basis and a liquid hydrolyzate; c. culturing a microorganism in the liquid hydrolyzate; and d. wherein the solids fraction has an increased protein content compared to the unfermented fraction. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification