甲醇气相羰化合成醋酸的反应机理及本征动力学

Reaction Mechanism and Intrinsic Kinetics of Acetic Acid Synthesized by Methanol Carbonylation in Gas Phase

用浸渍法制备了负载型Ni-Mo-La/AC复合催化剂,并在平推流反应器中对甲醇气相羰基化催化反应进行了动力学数据的测定。实验证明,醋酸甲酯是甲醇气相羰基化反应的中间产物,醋酸显示连串反应最终产物的特征,由醋酸甲酯水解生成;二甲醚通过甲醇脱水生成,碘甲烷和活性炭共同对该反应起催化作用,二甲醚可进一步羰化生成醋酸甲酯;甲烷由甲醇分解后的产物氢气与碘甲烷反应生成。根据反应机理建立了幂函数动力学模型,由实验数据线性回归计算得到了动力学参数。

Complex catalyst Ni-Mo-La/AC was prepared by impregnation method.And kinetic data of acetic acid catalytic synthesized by methanol carbonylation in gas phase were measured in a plug flow reactor.The results indicated that methyl acetate was the first order product of the vapour phase carbonylation of methanol,and acetic acid was the second order product of the sequential reaction by hydrolysis from methyl acetate.The dimethyl ether was obtained through dehydration of methanol.Methyl iodide and activated carbon had the catalysis effect together on this reaction.The dimethyl ether could also produce methyl acetate by carbonlylation;methane was obtained by reaction of methyl iodide and the production of methanol decomposition.On the base of above analysis,a reaction kinetics model was set up and model parameters were obtained by linear regression of data.