Catalytic Performance Of Benzyl Chloride Polymer Supported Ionic Liquid For The Addition Reaction Of CO₂

The synthesis of cyclic carbonates is one of the effective methods for chemical immobilization of CO₂. In recent years, it has been widely concerned about the research of catalysts for this kind of chemical reactions.In this paper, Benzyl Chloride Polymer?BCP? was synthesized by the self polymerization reaction of benzyl chloride with nano ?-Fe2O3 as catalyst. The FT-IR, 1H-NMR, EA and GPC were used to characterize the composition and structure, and the mechanism of the polymerization was also speculated. N-methylimidazole immobilized on polymer?BCP? carrier by the covalent bonding to form the imidazolium chloride supported ionic liquid?BCP-IMCl?, and and by ion exchange to get the BCP-IMBr?BCP-IMBF4, and were characterized by FT-IR, 1H-NMR and other methods to determine the compositions and structures. These supported ionic liquid type catalysts to the reaction catalyzed CO₂ and propylene oxide, carbonate synthesis carbonate synthesis of propylene ester ring, supported ionic liquid on the reaction of catalytic performance was evaluated. The results showed that BCP-IMBr performed the excellent performance. And we obtained the best reaction conditions, the amount of the catalyst?BCP-IMBr? was 0.3g, the reaction temperature 140?, the reaction time 5h, the initial pressure of CO₂ was 2.0MPa. Under the optimum conditions, we got the conversion of propylene oxide was 71.4%, TON was 37.0mol/ molIL. And the catalyst can be reused five times, the activity of the catalyst was not found to be reduced, and the recycling performance was good.In addition, the immobilized ionic liquid?BCP-IMBr? was applied to the cyclic addition reaction of carbon dioxide with other epoxy compounds. When the reaction of CO₂ and propylene oxide, we found that when the amount of the catalyst was 0.3g, the reaction temperature was 130?, the reaction time was 4h, the initial pressure of CO₂ was 2.0MPa, were the best reaction conditions of the reaction. Under the optimum conditions, the conversion of propylene oxide was 80.1%. The reaction conditions : the amount of the catalyst?BCP-IMBr? was 0.3g, reaction temperature of 140?, reaction time 5h, the initial pressure of CO₂ 2.0MPa, we let the CO₂ with epoxy ethane, phenyl ethylene oxide and 1,2-epoxy cyclohexane to react respectively. Finally when the substrate was epoxy ethane, reactant conversion rate was higher and reached 82.1%; the substrate was phenyl ethylene oxide, reactant conversion rate was 67.8%; when the substrate was 1,2-epoxy cyclohexane, reaction time was 12 h, the reactant conversion rate was low, only 36.3%.