Using Raman spectroscopy and a fused quartz tube reactor to study the oxidation of o-dichlorobenzene in hot compressed water.

Graphical abstract Highlights • O 2 and CO 2 were quantitatively and qualitatively analyzed by Raman spectroscopy. • The mineralization rate of o-DCB was evaluated with Raman peak height of CO 2. • O 2 demand and consumption were described during the reaction process. • The kinetic analysis was performed on the oxidation process of o-DCB. Abstract A fused quartz tube reactor (FQTR) and Raman spectroscopy were employed to investigate the decomposition of H 2 O 2 and o-dichlorobenzene (o-DCB) in hot compressed water (HCW). The results showed that o-DCB can be effectively degraded in HCW, and exhibited applicability as a powerful tool to quantitatively and qualitatively analyze O 2 and CO 2 using Raman spectroscopy combined with an FQTR. The decomposition rate of H 2 O 2 reached 95.4% at 8 min, and it completely decomposed after 23 min at 400 °C in the closed heating system. When the oxygen stoichiometric ratio (OSR) increased from 50% to 200% after 90 min at 400 °C, the degradation rate of o-DCB significantly increased from 67.5% to 100%. The conversion data for the kinetic analysis of o-DCB indicated that the reaction followed pseudo first-order kinetics and exhibited reaction rate constants of k 0.5 = 0.00782 s−1, k 1.0 = 0.01412 s−1, k 1.5 = 0.02675 s−1, and k 2.0 = 0.03509 s−1, respectively. [ABSTRACT FROM AUTHOR]