(729i) Production of Bio-Diesel Additives from Dairy Manure in Supercritical Ethanol Conference: AIChE Annual MeetingYear: 2015Proceeding: 2015 AIChE Annual MeetingGroup: Innovations of Green Process Engineering for Sustainable Energy and EnvironmentSession: Conversion of Solid Wastes to Energy and/or Product Time: Thursday, November 12, 2015 - 5:15pm-5:30pm Authors: Lu, M., University of Nevada, Reno Yang, X., University of Nevada, Reno Lin, H., University of Nevada, Reno Production of Bio-diesel Additives from Dairy Manure in Supercritical Ethanol Xiaokun Yang1, Mi Lu1, Marcus Vinicius Pereira1, Simon Poulson3, Charles Coronella1, and Hongfei Lin1* 1Chemical Engineering and Materials Science Department, 2Agriculture, Biotechnology & Natural Resources Department, 3Geological Sciences & EngineeringDepartment, University of Nevada, Reno, NV, U.S 89557 E-Mail: HongfeiL@unr.edu Dairy manure is regarded as a waste material that needs substantial waste management. However, as the biomass feedstock it contains lipid, protein, lignin, hemicellulose, and cellulose, which can be used to produce value-added chemicals. Herein, dried dairy manure was converted in ethanol and ethanol-water solutions at near supercritical conditions. The highest conversion of manure reached to 72% (ash free) under supercritical ethanol at 245°C. In the presence of solid Lewis acid catalysts, Zr-KIT-6 or hydrated niobia, ethyl esters from cellulose, hemicellulose and lignin were the main products, which can be used as biodiesel additives. It was found that adding 5-10 % water in ethanol enhanced the decomposition of recalcitrant cellulose and lignin, and thus increased the manure conversion and the overall yields of ethyl esters. Various process conditions including temperature, pressure, biomass-to-catalyst ratio, water-to-ethanol ratio, etc. were examined and optimized. High-loading amounts of manure were used in this process which makes the catalytic process promising for future's scale-up to industrial scale. Lastly, the possible reaction mechanism based on Lewis acid catalysis in supercritical ethanol-water solvents was discussed.