Systematic studies on the liquid-phase catalytic oxidation of cyclohexane to adipic acid by oxygen in a single stage using acetic acid as the solvent and cobalt acetate as the catalyst were carried out in the temperature range 90-140 °C under a pressure of 5 atm in a semicontinuous stirred reactor. Cyclohexanone to an extent of 1 % was used as the initiator. The reaction was found to be first-order with respect to cyclohexane. The effects of the various operating parameters, viz., temperature, catalyst concentration, solvent concentration, stirrer speed, and pressure of oxidation, on the overall reaction rate constant were assessed. The influence of mass transfer on the overall rate was deciphered. The mass-transfer coefficients were computed on the basis of penetration theory by employing the linearization approximation technique. The results were compared with those predicted by simple expressions in the literature.The liquid-phase oxidation of cyclohexane is an industrially important process for making cyclohexanol, cyclohexanone, and adipic acid. Adipic acid is extensively used
The kinetics of the reaction between 10-undecenoic acid and hydrogen bromide solution in toluene initiated by benzoyl peroxide was studied in a batch reactor in the temperature range 0-30 °C. The effects of temperature, initiator concentration, and initial mole ratio of HBr to 10-undecenoic acid on the yield of 11-bromoundecanoic acid and reaction rates were experimentally investigated. This reaction was found to exhibit "limiting conversion" behavior in the range of variables studied. A plausible explanation in the form of a mechanistic scheme for the overall reaction is provided. On the basis of the kinetic results, a free-radical chain reaction mechanism for the formation of 11bromoundecanoic acid from hydrogen bromide and 10-undecenoic acid has been postulated.
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