The oxidation of para-xylene in acetic acid catlayzed by Co~2+, Mn~2+ and Br is investigated, The experiments involving various levels of oxygen concentration, catalyst concentration and reactant/solvent ratio are conducted in an isothermal semi-batch reactor. Novel designs are carried out in sampling device to avoid components distribution deforming and dead zone. Among all the reaction condition factors, the most interesting phenomena is that the reduce of ractant/solvent ratio plays the greatest role in reaction rate acceleration.
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