“…In conclusion, the total energy required for the hydrothermal reaction with conventional heating for all possible film temperature values will be higher than the energy consumption in a microwave-heated reactor. In our best effort approach, an intermediate film temperature was assumed and the obtained results are comparable to (or even lower than) other literature reports (Afolabi et al, 2020;González-Arias et al, 2022;Kang et al, 2021;Shao et al, 2020;Śliz and Wilk, 2020)…”