| 摘要 |
The invention refers to a process for the oxidation of p-xylene and methylester of p-toluilic acid with gases containing oxygen in the Witten-Hercules process for the obtention of dimethylterephtalate in at least two partial stages carried out one after the other and in the presence of a catalyst. It is characterized in that at least a stage rich in p-xylene is oxidizes a part of the pX, as well as, given the case, cycle products with oxidable portions of following stages from the DMT process in the presence of 5 to 30 percent in mass of methylester of p-toluilic acid referred to the reaction mixture in the partial stage, and/or in at least another partial stage rich in methylester of p-toluilic acid oxidizing methylester of p-toluilic acid and/or p-toluilic acid, as well as, given the case, cycle products in the presence of 2 to 30 percent in mass of p-xylene, referred to the sum of methylester of p-toluilic acid and p-toluilic acid.
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