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Wet ethanol production process yields more ethanol and more co-products
Date:11/9/2009

URBANA Using a wet ethanol production method that begins by soaking corn kernels rather than grinding them, results in more gallons of ethanol and more usable co-products, giving ethanol producers a bigger bang for their buck by about 20 percent.

"The conventional ethanol production method has fewer steps, but other than distillers dried grains with soluble, it doesn't have any other co-products," said University of Illinois Agricultural Engineer Esha Khullar. "Whereas in both wet and dry fractionation processes, the result is ethanol, distillers dried grains with soluble, as well as germ and fiber. Corn fiber oil for example can be extracted from the fiber and used as heart-healthy additives in buttery spreads that can lower cholesterol."

In comparing the wet and dry fractionation methods, Khullar's research team found that when using the wet fractionation method, the result is even higher ethanol concentrations coming out of the fermenter and better quality co-products than the dry method.

In the wet process, the corn kernels are soaked, washing the germ, which Khullar says is a cleaner separation. "There's not a lot of starch sticking to the germ. That's why you get higher oil concentrations."

After the kernels are soaked they are ground to produce a slurry. The slurry is soaked with enzymes so that it raises the specific gravity to a point where the germ starts floating and can be fished out from the top.

Khullar explained that in the dry fractionation method, the kernel is crushed, flattening out the germ. "The germ is still attached to a certain part of the endosperm and you still have a few starch pieces sticking to it. You have a very high starch content germ from the dry fractionation and that lowers the oil content. That's why there's a big difference in the wet process versus the dry process."

Dry and wet fractionation methods have been developed to separate out the germ and pericarp fiber befor
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Contact: Debra Levey Larson
dlarson@illinois.edu
217-244-2880
University of Illinois at Urbana-Champaign
Source:Eurekalert

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