The reaction progress in supercritical water oxidation (SCWO) of methanol i
s simulated in terms of a detailed chemical kinetics model for the two idea
l reactors, plug flow reactor (PFR) and continuous stirred tank reactor (CS
TR). The reaction has an induction time and a character of first order reac
tion against the methanol concentration in PFR. The reaction does not appre
ciably depend on the oxygen concentration as far as the methanol conversion
is concerned. In CSTR, the dependence of methanol conversion X on residenc
e time t can be described using a simple first order relation applicable to
CSTR, taking into account the induction time tau phenomenologically, that
is, X/(1 - X) = k(t - tau). Conversion in the CSTR increases very rapidly a
gainst the residence time, compared with that in the PFR, and corresponding
ly the induction time is much shorter. The dependence of concentrations of
intermediates, i.e., CH2O and CO, against the residence time in CSTR is wea
ker than that in PFR, which is also the case for radical species, in partic
ular, HO2 and OH. Relevant elementary reactions are discussed.