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Structural Analysis of Bio-oils from Supercritical Ethanol Liquefaction of Swine Manure

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

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008727.(doi:10.13031/2013.29712)
Authors:   Shuangning Xiu, Abolghasem Shahbazi
Keywords:   Swine manure; Supercritical liquefaction; FTIR; Bio-oil

Swine manure was converted to bio-oils by using ethanol in an autoclave in the reaction temperature range of 240-360 oC without any catalyst. The experimental results show that the yield of the liquefaction products was significantly influenced by the reaction temperature. The maximum oil yield of 26.7% (of dry matter) with low content of oxygen (11.48%) and heating value of 33.98 MJ/kg was obtained at reaction temperature of 300 oC. The Bio-oil obtained at different reaction temperature was analyzed by Fourier transform infrared spectroscopy (FTIR), elemental analyses, heating values, water content analyses, ash content, and solids content. A low content of carbonyl and aliphatic groups and a high aromaticity in the bio-oil were found in the bio-oils from high temperature as determined by FTIR. The elemental composition of the bio-oil samples changes with reaction temperature. However, no particular trends in the elemental composition were found within the range of reaction temperature used.

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