Effect of the Polarity of the Medium on the Kinetics of the Radical-Chain Oxidation of Cumene in the Presence of Ascorbic Acid
The inhibition of the initiated oxidation of cumene by oxygen under homophase conditions, where acetonitrile or dimethylsulfoxide are used as the solvent, by ascorbic acid is studied. The kinetics of the oxidation process is investigated via a gas volumetric method at a constant temperature of 348 K and a partial pressure of oxygen of 760 mmHg. It is shown during the investigation of the process of radical-chain oxidation of model systems upon varying the concentration of the inhibitor that the replacement of the solvent noticeably affects the value of the induction period. No significant influence of the medium on the rate of the oxidation process after the induction period is found. Concentration dependences of the kinetic parameters of ascorbic acid-inhibited oxidation of cumene in different media are obtained.