The
instability of hydrothermal liquefaction (HTL) biocrude has
impeded the broader utilization of fuel and chemical feedstock. In
this paper, we investigated the storage stability of biocrude produced
from HTL of microalgae. The biocrude showed good stability in phase
homogeneity and water content, whereas the viscosity and average molecular
weight increased by 48.4 and 41.9%, respectively, after storing for
12 months. Thermogravimetric analysis (TGA) and asphaltene content
analysis indicated more high-boiling-point fraction, and asphaltene
fraction appeared in biocrude during storage. Further elemental analysis
and increased total acid numbers (TANs) demonstrated that oxidization
acidic-compound-forming reactions occurred, and the gas chromatography–mass
spectrometry (GC–MS) results evidenced this guess. However,
the mechanism of biocrude storage instability still needs further
analysis. The current biocrude assuredly requires stabilization refining
for future applications.
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