离子液体催化CO_(2)与环氧丙烷合成碳酸丙烯酯反应动力学研究

Study on reaction kinetics of synthesizing propylene carbonate from carbon dioxide and propylene oxide catalyzed by ionic liquids

利用自制烷基功能化催化剂催化环氧丙烷(PO)与CO_(2)环加成生成碳酸丙烯酯(PC),对催化剂用量,反应温度,反应压力及反应时间进行优化,推导了该催化剂催化PC合成的反应机理并建立了动力学方程,讨论了不同温度下PO转化率和PC生成速率随时间变化的规律。实验结果表明,当催化剂用量为0.8%(w)、反应温度140℃、反应压力4.0 MPa、反应时间2.0 h时,PO转化率可达99.61%,PC收率达99.25%。PC合成反应速率与PO的浓度呈线性关系,并遵循一级反应动力学规律。

The self-made alkyl functionalization catalyst was prepared and applied in the cycloaddition reaction of propylene oxide(PO)and CO_(2) to propylene carbonate(PC).The catalyst amount,the reaction temperature,the reaction pressure and the reaction time were optimized.The reaction mechanism was derived.The kinetic equation was established.And the relationship of PO conversion and PC yield with time at different temperatures was discussed.The experimental results show that the PO conversion and the PC yield can reach 99.61%and 99.25%respectively when the catalyst amount is 0.8%(w),the reaction temperature is 140℃,the reaction pressure is 4.0 MPa,and the reaction time is 2.0 h.The reaction rate of PC synthesis exhibits a linear relationship with the concentration of PO and follows the first-order reaction kinetics law.