(38e) Effects of Process Conditions on Metal Content in Biocrude from Hydrothermal Liquefaction of Microalgae
We hydrothermally treated microalgae using different processing conditions (isothermal reaction vs. rapid heating, different temperatures and reaction times, different reactor loadings) and determined the amounts of thirteen different metals in the biocrude oil as well as in the other product phases. The metal content in biocrude oil undergoes dramatic change within the first 5 minutes of HTL reaction. Generally, lighter elements are transferred into bio-oil faster than heavier metals. Iron in bio-oil behaves differently than many of the other metals, and is the target metal to be removed due to its abundance. As the reaction conditions become more severe, less iron resides in bio-oil phase. Optimum reaction conditions could be identified in terms of a high bio-oil yield and low metal concentration in the bio-oil. The results from this study provide the first glimpse into how and whether HTL process conditions can be used to manipulate metal content in algae biocrude.
 Jarvis, Jacqueline M., et al. "Impact of iron porphyrin complexes when hydroprocessing algal HTL biocrude." Fuel 182 (2016): 411-418.