The yieldsoftheHTL products obtainedat350 °Cand a reaction time
of 15 min are presented in Table 2. The mass balance closures range between 92.5 and 99.2 wt.% of the total organic mass loaded to thereactor,
indicating a good quality of the mass balances. The highest biocrude oil
yield is 28.1 ± 1.1 wt.% for A. esculenta, beinglower for the other species
(20.9 ± 0.8 wt.% for L. saccharina and 22.0 ± 0.9 wt.% for F. vesiculosus).
The ANOVA analysis showed that the differences within strains for the
various product yields were statistically different (at α = 0.05).
L. saccharina shows the highest degradation of all the species tested, as
it leaves behind only 7.7 ± 0.8 wt.% of solid residue. However, this
high degradation does not result in a higher biocrude oil yield, but rather in the increase of water soluble and gas products. F. vesiculosus leads
to a yield of solids of 24.5 ± 1.2 wt.%, more than three times higher. For
all the species, the main gas compound produced (N95%) was CO2
(probably coming from decarboxylation reactions) followed by small
quantities of hydrogen, methane and C2–C3 gases