Abstract
A kinetic study about the bleaching of kraft pulp by hydrogen peroxide in a reaction catalyzed by binuclear manganese complexes is presented. The various kinetic parameters (initial reaction orders, activation energy, and integrated kinetic laws) were determined for various reactions involving the action of the complex on lignin and its regeneration by hydrogen peroxide. The regeneration rate of the oxidized form of the complex is faster than the lignin oxidation rate. The influence of stirring on the rate of the reaction complex/kraft pulp suggested an oxidation process limited by the transport of the complex from the solution into the wood pulp and into the pulp fibers. For low reaction duration, the rate-limiting step is the diffusion of the complex into the pulp fibers, a step unaffected by stirring.
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