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ARS Home » Plains Area » Brookings, South Dakota » Integrated Cropping Systems Research » Research » Publications at this Location » Publication #245654
Title: Measurement and Comparison of Glass Transition and Sticky Point Temperatures for DDGS as Affected by CDS and Drying Temperature Levels

Author
item BHADRA, RUMELA - South Dakota State University
item MUTHUKUMARAPPAN, M - South Dakota State University
item Rosentrater, Kurt

Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/17/2009
Publication Date: 9/17/2009
Citation: Bhadra, R., Muthukumarappan, M., Rosentrater, K.A. 2009. Measurement and Comparison of Glass Transition and Sticky Point Temperatures for DDGS as Affected by CDS and Drying Temperature Levels. 2009 ASABE Annual International Meeting, Reno NV, June 21-24, 2009.

Interpretive Summary: Distillers dried grains with solubles (DDGS) is the main coproduct of the fuel ethanol industry; and has significantly impacted the livestock feeds market in recent years. It must often be transported over long distances to meet market demands both domestically and internationally. Particle agglomeration during storage and transport of DDGS, exhibited by flowability problems, is often a hindrance, a nuisance, and expensive. Several studies have previously examined physical, chemical, and flow properties of DDGS. But this paper will aim at characterizing the glass transition temperature (Tg) and sticky point temperature (Ts) of DDGS samples prepared using varying CDS levels (10, 15, and 20%, wb) and drying temperatures (100, 200, and 300°C), and its implication on flowability of DDGS. Distillers wet grains (DWG) is combined with specified levels of CDS and dried in convection type laboratory oven to produce DDGS. To determine Tg (°C), a differential scanning calorimeter (DSC) was used and Ts (°C) was determined with a rheometer. Results included correlations between Ts and Tg (R2 = 0.87) and a global model for predicted Tg (R2 = 0.74). Stickiness of DDGS increased with an increase in moisture content indicating flow problems due to excessive moisture. It was found out that drying temperatures and CDS levels each had significant effects on Tg and Ts.

Technical Abstract: Distillers dried grains with solubles (DDGS) is the main coproduct of the fuel ethanol industry; and has significantly impacted the livestock feeds market in recent years. It must often be transported over long distances to meet market demands both domestically and internationally. Particle agglomeration during storage and transport of DDGS, exhibited by flowability problems, is often a hindrance, a nuisance, and expensive. Several studies have previously examined physical, chemical, and flow properties of DDGS. But this paper will aim at characterizing the glass transition temperature (Tg) and sticky point temperature (Ts) of DDGS samples prepared using varying CDS levels (10, 15, and 20%, wb) and drying temperatures (100, 200, and 300°C), and its implication on flowability of DDGS. Distillers wet grains (DWG) is combined with specified levels of CDS and dried in convection type laboratory oven to produce DDGS. To determine Tg (°C), a differential scanning calorimeter (DSC) was used and Ts (°C) was determined with a rheometer. Results included correlations between Ts and Tg (R2 = 0.87) and a global model for predicted Tg (R2 = 0.74). Stickiness of DDGS increased with an increase in moisture content indicating flow problems due to excessive moisture. It was found out that drying temperatures and CDS levels each had significant effects on Tg and Ts.