“…With a high enough concentration of organic aqueous solution as well as the temperature above the autoignition temperature, it is possible to generate hydrothermal flames in SCWO processes. This phenomenon occurred due to the autoignition temperature of organic compound reduced under high pressure conditions (Cabeza et al, 2011(Cabeza et al, , 2013Hirosaka et al, 2007;Narayanan et al, 2008;Queiroz et al, 2013Queiroz et al, , 2015SierraPallares et al, 2009). Ignition can happen easily as the organic feeds were gaseous fuels, alcohols or other flammable organic compounds, while auxiliary fuel was required to form hydrothermal flames as with recalcitrant compounds.…”