Thermochemical liquefaction of pig manure: Factors influencing on oil

This study used thermochemical liquefaction technology to prepare bio-oil from pig manure with ethanol as liquefaction solvent. The work investigated the effects of liquefaction temperatures (T), solid-liquid rates (R-1) and solvent filling rates (R-2) on the yield, composition and property of bio-oil. The yield of bio-oil enhanced initially and then declined slightly with the enhancement of T and R-2, nevertheless, the yield of bio-oil decreased constantly with the increase of R-1, and the topmost yield of bio-oil in this experiment was 35.56% when the solid-liquid rate was 5%. The work studied the properties of bio-oil generated by pig manure under different liquefaction temperatures. The results of gas chromatography-mass spectroscopy analysis revealed that the dominating composition of bio-oil from pig manure were esters, long-chain hydrocarbons, ketones, ethanol, organic acids and nitrogen compounds. The heating value of bio-oil (34.39 similar to 37.03 MJ/kg) obtained by thermochemical liquefaction of pig manure was close to the heating value of gasoline (46 MJ/kg). Electronic scanning of liquefaction residue has also been reported.