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Microwave pyrolysis of distillers dried grain with solubles (DDGS) for biofuel production |
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| Authors: | Lei Hanwu Ren Shoujie Wang Lu Bu Quan Julson James Holladay John Ruan Roger |
| Institution: | a Bioproducts, Sciences and Engineering Laboratory, Department of Biological Systems Engineering, Washington State University, Richland, WA 99354-1671, USA b Department of Agricultural and Biological Engineering, South Dakota State University, Brookings, SD 57006, USA c Pacific Northwest National Laboratory, Richland, WA 99354-1671, USA d Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA |
| Abstract: | Microwave pyrolysis of distillers dried grain with solubles (DDGS) was investigated to determine the effects of pyrolytic conditions on the yields of bio-oil, syngas, and biochar. Pyrolysis process variables included reaction temperature, time, and power input. Microwave pyrolysis of DDGS was analyzed using response surface methodology to find out the effect of process variables on the biofuel (bio-oil and syngas) conversion yield and establish prediction models. Bio-oil recovery was in the range of 26.5-50.3 wt.% of the biomass. Biochar yields were 23.5-62.2% depending on the pyrolysis conditions. The energy content of DDGS bio-oils was 28 MJ/kg obtained at the 650 °C and 8 min, which was about 66.7% of the heating value of gasoline. GC/MS analysis indicated that the biooil contained a series of important and useful chemical compounds: aliphatic and aromatic hydrocarbons. At least 13% of DDGS bio-oil was the same hydrocarbon compounds found in regular unleaded gasoline. |
| Keywords: | Microwave pyrolysis DDGS Hydrocarbon GC/MS |
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