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Effect of Corn Flour Particle Size on Ethanol Yield and Soluble Solids in Thin Stillage in a Dry Grind rocess

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  036067,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14132) @2003
Authors:   Kalpana Naidu, Vijay Singh
Keywords:   Dry-grind, Ethanol, Particle Size, Thin Stillage

The effect of corn flour particle size on ethanol yields and soluble solids in thin stillage in a dry-grind process were studied. Predictably, in a conventional dry grind process, ethanol yields increased approximately by 102% as particle size varied from 1.077 mm to 0.568 mm (mean geometric diameter). The highest ethanol production rates were achieved with a finer particle size (0.569 mm) passing through 2mm screen of the hammer mill. No specific trend was seen in the amount of dry solids in thin stillage. By optimizing flour particle size for maximum ethanol yield and minimum solids in thin stillage, the current study will help in reducing capital/operating costs in drygrind ethanol plants.

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