(452b) Fast Pyrolysis of Lignocellulosic Biomass to Produce Biooil and Biochar: Parameter Optimization and Physicochemical Analysis of Them

In this study, yellow poplar wood (Liriodendron tulipifera) was pyrolyzed using a fluidized bed reactor under different temperature range and residence time. The reaction temperature ranged from 400?aC to 550?aC and the residence time was controlled between 1.2sec and 7.7sec by inert nitrogen gas flow. The mass balances of three main thermal degradation products (biooil, biochar and gases) were determined in every run and the physical and chemical properties of the biooils were characterized. The mass balances of biooil, biochar and gases produced during pyrolysis were closely influenced with pyrolysis temperature and residence time. The yield of biooil was gradually increased with increasing temperature up to 500?aC as well as shortening the residence time, while char formation was retarded. The maximum yield of biooil was determined to ca. 68.5 wt% at 500?aC and 1.9sec. Biochar yield was varied from 7.9% to 28.9%. Biochar was composed more than 80% of carbon and higher heating value was estimated to ca. 28MJ/kg. According to XRF analysis a considerable amount of inorganic metals was detected in the biochar. Among diverse inorganic metals, K, P, Ca and Mg as important plant mineral nutrients were highly concentrated in the biochar. The physical properties of biooil - pH value, water content and viscosity - were also varied with the pyrolysis condition. Biooil was quite acidic (pH 2-3) and contained 20 - 30% of water. The viscosity of biooil at 40?aC was estimated to 10 - 20cSt. Chemical composition of biooil was analyzed by Gaschromatographic method equipped with FID and MS detector. More than 70 peaks appeared on the chromatogram. Among them 30 compounds were identified by comparison of mass spectra of each peak with those of authentic compounds in a mass spectra library (NIST). 2(5H)-furanone, 3,4-dihydro-2H-pyran-one and 2-hydroxy-3-methyl-2-cyclopenten-1-one as degradation compound derived from cellulose and vanillin, 2-methoxy-4-(1-propenyl) phenol, 2,6-dimethoxy phenol, 2,6-dimethoxy-3-(propenyl) phenol from lignin polymer were identified in the biooil.