2,6-二甲基萘催化氧化制备2,6-萘二甲酸动力学

摘要

研究了Co-Mn-Br催化体系下,2,6-二甲基萘液相氧化制备2,6-萘二甲酸的动力学规律,分析了各中间产物,建立了氧化反应网络,提出了双曲型反应动力学模型.考察了反应物浓度,温度和催化剂含量对反应速率的影响,并依据实验数据拟合出动力学参数和各步反应的活化能.结果表明,双曲型的动力学模型能够较好地描述反应过程,计算结果与实验数据吻合良好.2,6-二甲基萘液相氧化为典型串联反应过程,两个甲基依次先后氧化为醛和酸,其中2-甲酰基-6-萘酸生成2,6-萘二甲酸的反应是整个反应的控制步骤.%The kinetics of 2,6-dimethylnaphthalene to 2,6-naphthalene dicarboxylic acid catalyzed by Cobalt-Manganese-Bromide in liquid phase was studied.The intermediates were analyzed and the oxidation reaction network was established.The hyperbolic kinetic model was proposed and the effects of reactant concentration,temperature and catalyst content on the reaction rate were investigated.Based on the experimental data,the kinetic parameters and the activation energy data of each step were fitted.The results showed that the hyperbolic kinetic model could well describe the reaction process,and the calculated results were in good agreement with the experimental data.The liquid phase oxidation of 2,6-dimethylnaphthalene was a typical cascade reaction.The two methyl groups were successively oxidized to formacyl and carboxyl groups.The reaction of 2-formyl-6-naphthoic acid to 2,6-naphthalene dicarboxylic acid was the rating-limiting step in the whole series reactions.