468121 Composition of Bio-Crude Oils from Hydrothermal Liquefaction of Algae in Batch Reactor

Thursday, November 17, 2016: 3:35 PM
Franciscan B (Hilton San Francisco Union Square)
Zheng Cui1, Feng Cheng2, Travis Le-Doux2, Kwonit Mallick3, Carolina Herrera2, Graham Hoffman1, Jacqueline Jarvis4, Neil Paz4, Tanner Schaub4, Nagamany Nirmalakhandan5 and Catherine E. Brewer1, (1)Department of Chemical & Materials Engineering, New Mexico State University, Las Cruces, NM, (2)Department of Chemical & Materials Engineering, New Mexico State University, (3)Civil & Environmental Engineering, New Mexico State University, Las Cruces, NM, (4)Chemical Analysis and Instrumentation Laboratory, College of Agricultural, Consumer and Environmental Science, New Mexico State University, (5)Civil & Environmental Engineering, New Mexico State University

Due to the limitations of food, farmland, and weather, novel biofuels produced from hydrothermal liquefaction of biomass has attracted much attention. Algae-derived oils from hydrothermal liquefaction are promising because of high algae growth rates, strong CO2-mitigation potential, and avoidance of drying requirements. In hydrothermal liquefaction, water at subcritical states (270-350°C and 80-173 bar) catalyzes depolymerization of lipids, proteins and carbohydrates in algae, leading to relatively high yields of bio-crude oil that can be valorized to transportation fuels. In this study, we investigated the influences of operating conditions (temperatures of 310-350 °C, residence times of 5-60 min, and solid algae contents of 5-10 wt.%) on the composition of bio-crude oil from hydrothermal liquefaction of Nannochloropsis salina and Galdieria sulphuraria using a variety of analytical methods. Organic molecules with molecular masses of ~150-700 Da were observed by Fourier transform ion cyclotron resonance mass spectroscopy (FT-ICR/MS) for comprehensive qualitative compositional description that employed three complimentary ionization methods. Free fatty acids in the HTL oil were quantitated by gas chromatography mass spectroscopy (GC/MS). Higher heating values and CHNS elemental content were also measured by bomb calorimeter and elemental analysis to obtain information about energy recovery relative to previous studies. Bio-crude oil characterization results will be used to optimize hydrothermal liquefaction operating conditions in a 1.8 L batch reactor and to select initial conditions for a pilot scale, continuous flow reactor.

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See more of this Group/Topical: Catalysis and Reaction Engineering Division