醋酸甲酯羰基化合成醋酐的工程动力学研究

Studies on Kinetics of Carbonylation of Methyl Acetate to Prepare Acetate Anhydride

以LiI为促进剂的铑一碘液相催化剂体系作催化剂，在170～199℃的温度范围和5MPa压力的实验条件下，对醋酸甲酯羰基化合成醋酐的反应动力学进行了研究。分别用一级不可逆和二级可逆的反应速率模型对实验数据进行处理，得到了一级不可逆反应和二级可逆反应的动力学方程。通过比较，理论计算值与实验值相拟合，证明两种模型都是可用的。一级不可逆和二级可逆反应动力学方程分别为r=dcA/dt=kcA=208×10^7exp（-8.124×10^4/RT）CA和r=dcA/dt=kcA=3.746×10^11exp（-1.246×10^5/RT）cA.

The kinetics of carbonylation of methyl acetate to produce acetate anhydride was studied at 5 MPa and 170～190℃ using a homogenous catalyst based on rhodium promoted by alkali metal. The experimental data was treated by 1^st-order irreversible reaction model and 2ha-order reversible model. The obtained 2^st-order irreversible reaction rate equation is r=dcA/dt=kcA=208×10^7exp（-8.124×10^4/RT）cA, and 2^nd- order reversi-ble reaction rate equation is r=dcA/dt=kcA=3.746×10^11exp（-1.246×10^5/RT）cA,Comparision results of the calculation data with experimental data showed that the two models were reasonable for the reaction.