化学
甲醇
碳酸丙烯酯
卤化物
碱金属
催化作用
dBc公司
碳酸二甲酯
环氧丙烷
无机化学
18-冠-6
产量(工程)
有机化学
物理化学
离子
电化学
共聚物
聚合物
环氧乙烷
电极
物理
材料科学
相位噪声
光学
冶金
作者
Lei Li,Shikai Shi,Li Song,Liping Guo,Yifei Wang,Hongxia Ma,Jie Hou,Haidong Wang
标识
DOI:10.1016/j.jorganchem.2015.07.010
摘要
Crown ethers (i.e. [2,4]-dibenzo-18-crown-6 (DBC), 18-crown-6, 15-crown-5 and 12-crown-4) show obvious co-catalytic effect for alkali halides catalyzing one-step synthesis of dimethyl carbonate (DMC) from CO2, propylene oxide and methanol. Especially, the DMC yield of KCl catalyst promoted by DBC can increase by more than five times and reach about 40% under mild reaction conditions (i.e., low mole ratio of methanol and epoxieds: 7:3, low initial pressure of CO2: 1.5 MPa, reaction temperature: 140 °C, time: 10 h). The optimized molar ratio of KCl to DBC is 2: 1. Due to the good complexing ability between DBC and K+, KCl and DBC formed an organometallic complex. Actually, DBC can not only promote the reaction rate and equilibrium of cycloaddition and transesterification reactions, but also prevent side reaction. Importantly, DBC can conveniently achieve high recovery ratio and show excellent reusability.
科研通智能强力驱动
Strongly Powered by AbleSci AI