酸离子液体中制备生物柴油组分酯化反应动力学

Kinetic study on esterification of biodiesel component prepared in acidic ionic liquids

以4类不同含氮官能团及不同阴离子的B酸离子液体为催化剂,研究了油酸甲酯的酯化反应动力学。通过反应动力学实验,利用Matlab程序,将实验数据回归拟合,确定反应动力学参数,建立动力学模型,并对不同离子液体催化剂活性进行评价。结果表明,不同酸离子液体催化剂作用下,油酸甲酯酯化反应动力学方程为:r=k(c_(A0)-x)^(1.72)(c_(B0)-x)^(2.01)-k_(-1)x^(1.85)。9种离子液体催化体系的正向反应速率常数k顺序为:[MPy]HSO_4>[Py]HSO_4>[Et_3NH]HSO_4>[MPy]H_2PO_4>[Py]H_2PO_4>[Et_3NH]H_2PO_4>[HMIm]HSO_4>[HMIm]H_2PO_4>[MPy]NO_3。

Four kinds of BrФnsted acidic ionic liquids with nitrogen chemical groups and different anions were synthesized. The kinetics of estrification of methyl oleate was studied using BrФnsted acidic ionic liquids as the catalysts. Through experiments of kinetics and by Matlab programs and regression of the experimental data, the reaction dynamics parameters were determined and the reaction dynamic model was set up. The catalytic activities of ionic liquids were investigated. The results that showed under the coaction of anions and cations, the kinetic equation of esterification was as follows ： r = k （ CA0 = X ） 1.72 （ CB0 - x ） ^2.01 - k - ix^1.85, and the sequence of reaction rate constants k of nine kinds of ionic liquids in catalyst system were as follows： [ MPy ] HSO4 〉 [ Py ] HSO4 〉 [Et3 NH ] HSO4 〉 [ MPy ] H2 PO4 〉 [ Py ] H2PO4 〉 [Et3 NH ] H2 PO4 〉 [ HMIm] HSO4 〉 [ HMIml H2PO4 〉 E MPy ] NO3.