Abstract
The kinetics of acrylic acid oxidation in the presence of iron ions \( (T = 333K,_{P_{O_2 } } = 1 atm) \) has been investigated by measuring the oxygen uptake. The reaction has an induction period τ, after which the O2 uptake is described by the parabolic kinetic law δ[O2]0.5 = b(t − τ). The parameter b characterizing the catalytic oxidation of acrylic acid has been calculated. Upon the introduction of an initiator (azobisisobutyronitrile), the oxidation has no induction period, but the autoacceleration of the reaction is still observed. A mechanism is suggested for the process. This mechanism includes initiation due to the interaction of the resulting peroxide and hydroperoxide groups with Fe2+ and Fe3+ ions and chain termination via the reaction R· + Fe3+, where R· is an acrylic acid macroradical.
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