分子氧常压氧化制备间苯二甲酸的研究

以分子氧为氧化剂，在气液两相条件下研究了间二甲苯氧化制备间苯二甲酸的反应，考察了各因素对反应的影响，确定了适宜的反应条件。在间二甲苯0.5 mL、乙酸钴催化剂用量0.05 g、促进剂溴化钠用量0.02 g、冰乙酸溶剂20 mL、反应温度90 ℃、反应时间8 h、氧气流速100 mL/min的条件下，间二甲苯转化率达到100%，间苯二甲酸收率达到98.36%。

STUDY ON THE PREPARATION OF m-TOLUIC ACID BY OXIDATION WITH OXYGEN UNDER ATMOSPHERIC PRESSURE

Gas-liquid phase oxidation of m-xylene under atmospheric pressure to prepare m-toluic acid was studied using oxygen as oxidant,cobalt acetate as catalyst and acetic anhydride as solvent.The effect of reaction conditions on the conversion of m-xylene and the yield of m-toluic acid was investigated and optimum conditions were obtained.It was found that under the optimum conditions of a m-xylene amount of 0.5 mL,a catalyst dosage of 0.05 g,a NaBr promoter dosage of 0.02 g,a solvent amount of 20 mL,an oxygen flow rate of 100 mL/min,a reaction temperature of 90℃ and a reaction time of 8 h,the conversion of m-xylene and the yield of m-toluic acid reached 100% and 98.36%,respectively.