Oxidation of alkyl aromatic hydrocarbon is an important chemical process. Acomprehensive research program was carded out in this paper to understand themechanism and kinetics of alkyl aromatic hydrocarbon oxidation catalyzed by MC(Mid-Century) process, which proceeds in acetic acid and catalyzed by Co/Mn/Btternary system. The work and results are outlined as follows. Firstly, The mechanism of MC process was studied. A comprehensive radicalchain mechanism for oxidation of methyl aromatics hydrocarbon was proposed, fromwhich the kinetic model with hyperbolic form for the main and side reactions werederived. A lot of experiments were carried out to verify the model. Both experimentaland industrial results provide the evidences to support the model. Experiments forkinetic study of toluene, p-xylene m-xylene oxidation were carded out, influences oftemperature, catalyst concentration, Co/Mn ratio, under various process conditionswere investigated, the database and models were obtained. Secondly, synergetic effects of the catalytic additives, such as N-oxidizes,diamines, guanidines and pyridine derivative were investigated experimentally. Theresults reveal that with addition of stable nitrogenous compounds, Co/Mn/Br/Nquaternary catalyst system has higher activity and selectivity than Co/Mn/Br temarysystem. New catalyst additives such as N-oxidizes, Diamine and Guanidine are foundfirstly. Among the catalyst additives, N-oxidizes exhibits the highest activity, whichcan match up to Bromide. The replacement of 50﹪ Bromide by equal massN-oxidizes shows no difference in catalysis activity. Finally, the liquid phase oxidation degradation of polystyrene was investigatedexperimentally. Two methods for degradation of polystyrene-waste to producebenzoic acid were suggested. One is co-oxidizing PS with toluene, and PSMC-catalysis oxidation is another method. The results show that these methods fordegradation of polystyrene-waste are feasible.