The oxidation of aqueous phenol by oxygen has been studied at elevated temperature and pressure by use of the stopped flow technique. High performance liquid chromatography has been used to identify the oxidation products and estimate their concentrations. A detailed reaction mechanism is proposed.

The kinetics of the reaction of oxygen with sodium sulphite in aqueous solution without and with a catalyst of cobaltous sulphate have been studied by a flow thermal method. The rate of reaction of oxygen and sodium sulphite was found to be first‐order with respect to oxygen and variable order with respect to sulphite, and the promoting effect of cobaltous catalyst was proportional to its concentration. A reaction mechanism has been proposed and a rate expression derived which is in good agreement with the experimental data.

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The influence of reactant segregation and of the rate of reactant mixing on fast homogeneous chemical reaction rates is considered and a computer model presented to simulate the effect of mixing within a tubular reactor fed by two segregated but miscible streams. Results obtained from use of the model are discussed.