离子液体中裂解C_5馏分二烯烃聚合反应动力学

Dimerization kinetics of C_5 fraction dienes in ionic liquid

用离子液体1-丁基-3-甲基咪唑六氟磷酸盐作为裂解C5馏分中混合二烯烃的反应介质和催化剂,考察了其对混合二烯烃二聚反应的影响。在温度303.15—343.15 K、离子液体质量分数0.3—0.8范围内,采用封管实验方法测定了C5混合二烯烃的动力学数据。在相同温度范围内,测定了离子液体介质中环戊二烯无限稀释状态下的动力学数据。将催化剂影响因数引入Arrhen ius方程,确定了离子液体介质中二烯烃聚合反应动力学模型。用墨森数值积分和非线性最小二乘法拟合求取了各反应速率常数,得到了模型参数和各聚合反应对于催化剂质量分数的反应级数,动力学模型预测值与实验值吻合良好。

Ionic liquid of 1-butyl-3-methyl imidazolium hexafluorophosphate was used as a reaction medium and catalyst for dimerization of mixed dienes in C5 fraction, and their influences on dimerization were investigated. The kinetic data of dimerization were determined by sealed-tube method at temperature of 303.15-343.15 K and ionic liquid mass fraction of 0.3-0.8. In the same temperature scope and infinite dilution conditions of cyclopentadiene in ionic liquid, the kinetic data of cyclopentadiene dimerization were also determined. In the evaluation of kinetic model of dienes dimerization, catalytic effect of ionic liquid was introduced into the Arrhenius equation and model parameters and reaction orders of polymerization for catalyst mass fraction were obtained. Reaction rate constants were calculated through Mexson numerical integration and Least Square methods. The model prediction agreed well with the experimental data.