Energize New Mexico
National Science Foundation
Hydrothermal liquefaction (HTL) of high-lipid microalgae Nannochloropsis salina (N. salina) and low-lipid microalgae Galdieria sulphuraria (G. sulphuraria) were run under subcritical conditions (310-350 Â°C and 10-17 MPa) in a 1.8 L batch autoclave system. HTL mass and energy balances for both species were compared for under different reaction operating conditions to predict the optimum reaction conditions for new algae strains based on their feedstock composition. Bio-crude oils and chars were characterized by bomb calorimetry, elemental analysis, inductively coupled plasma optical emission spectrometry (ICP-OES), and thermogravimetric analysis (TGA). Under the optimized conditions, 59 wt.% and 31 wt.% of the bio-oil yields were obtained from HTLs of N. salina and G. sulphuraria, respectively. Meanwhile, 85% and 59% of the feedstock energy was partitioned into N. salina-derived and G. sulphuraria-derived bio-crude oils, respectively. More favorable energy balances were related to shorter reaction times and higher algal solid contents.
Brewer, Catherine. "High Lipid Low Lipid Algae HTL Mass Energy Balances." (2018). https://digitalrepository.unm.edu/energizenm/674