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Effects of Varying CDS, Drying and Cooling Temperatures on Glass Transition Temperature of DDGS

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

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008603.(doi:10.13031/2013.29964)
Authors:   Rumela Bhadra, Kurt A Rosentrater, K Muthukumarappan
Keywords:   Caking, Distillers wet grains, Drying, Flowability

Distillers dried grains with solubles (DDGS), a co product of the corn-based fuel ethanol industry, is used widely as an animal feed. Due to increased demand for DDGS in livestock markets it has become essential to transport DDGS over long distances. Flowability problems in DDGS, due to particle caking, often create nuisance in storage and transportation. Materials above the glass transition temperature (Tg) can exist in a rubbery state, this condition can often be responsible for structural collapse, particle agglomeration, and caking of materials. This study investigated the effects of varying CDS (10, 15, and 20%, wb), drying (100, 200, and 300C), and cooling temperature (-12 and 35C) levels on the Tg of DDGS. Tg was found to range from 34 to 58C and 41 to 59C for cooling temperatures of -12C and 35C, respectively. Results indicated that there were significant differences due to the levels of CDS, drying, and cooling temperatures, individually as well as simultaneously. There were also significant interaction effects. Response surface regression yielded a predictive model with R2 of 0.74 and SEM of 3.16. Using this regression equation, optimum ranges for drying and cooling temperatures were determined for various ambient conditions. These may be used to avoid flow problems.

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