383645 Characterization of Aqueous Phase Bio-Oil Derived from Switchgrass Pyrolysis

Wednesday, November 19, 2014: 1:45 PM
M104 (Marriott Marquis Atlanta)
Shoujie Ren, Department of Biosystems Engineering & Soil Science, University of Tennessee, Knoxville, TN, X. Philip Ye, Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN and Abhijeet P. Borole, BioSciences Division, Oak Ridge National Laboratory, Oak Ridge, TN

Bio-oil is carbon based liquid product from biomass pyrolysis. Bio-oil is considered to be a promising substitute of crude oil in the applications as source of chemicals and fuels. However, bio-oil has high water content, high viscosity, low heating value, low pH value, and high oxygen content, leading to poor and inconsistent physicochemical properties. Bio-oil consists of hundreds of chemicals with wide range of molecular weight, some of which are water-soluble. Addition of water to bio-oil results in phase separation. The aqueous phase of bio-oil accounts for about 60% of crude bio-oil and has higher oxygen content. Conventional analytic method of GC-FID or HPLC only can quantify a small portion of the aqueous phase bio-oil as it contains volatile and non-volatiles compounds. The lack of adequate norms and standards for bio-oil and the bio-oil aqueous phase analysis have inhibited their industrialized production and application. In this study, the physical properties of bio-oil and aqueous phase from swichgrass pyrolysis were investigated and a combination technique of organic solvent extraction, GC/MS, GC-FID and HPLC-PDA was used to identify and quantify chemicals in aqueous phase bio-oil in order to comprehensively understand the chemical distribution in aqueous phase bio-oil. Three organic solvents, hexane, ethyl acetate, and chloroform were investigated as solvent to extract chemicals from aqueous phase and extracted chemicals were identified by GC/MS. The main chemicals in aqueous phase were classified into 7 categories including acids, aldehydes, ketones, furans, phenols, ethers, and alcohols.The aqueous phase bio-oil was analyzed by both GC-FID and HPLC-PDA at the wave length range of 190nm to 350nm. At least 2 predominant chemicals were quantified in GC-FID and HPLC-PDA using external standard chemicals.

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See more of this Session: Thermochemical Conversion of Biomass II
See more of this Group/Topical: 2014 International Congress on Energy (ICE)