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本文探讨了二甲苯催化氧化规律。在催化氧化反应中,催化剂的金属离子是主要的活性组份,阴离子则主要影响其溶解性及稳定性,并存在有催化剂的“异常浓度效应。”确定了二甲苯氧化时催化剂中Co的合适浓度为80—150ppm。采用反应与分析相结合的方法,发现对二甲苯合并氧化主要受甲苯甲酸甲酯中对甲酚的抑制,其含量>100ppm 时,对合并氧化起强抑制作用。建议在工业上先将对二甲苯氧化,然后再加入对甲苯甲酸甲酯以部份抵销对甲酚的抑制作用。
This article discusses the xylene catalytic oxidation law. In the catalytic oxidation reaction, the metal ion of the catalyst is the main active component, while the anion mainly affects its solubility and stability, and there is an “abnormal concentration effect” of the catalyst. "The suitability of Co in xylene oxidation catalyst The concentration is 80-150ppm. Using a combination of reaction and analysis, it was found that the para-xylene oxidation was mainly inhibited by p-cresol in methyl toluate. When the content was> 100ppm, the combined oxidation was strongly inhibited. It is advisable to first oxidize p-xylene in the industry and then add methyl p-toluate to partially counteract the inhibition of p-cresol.