Using The Immobilized Ionic Liquid Heterogeneous Catalysis Epoxy Ethane Synthesis Of Ethylene Carbonate And Carbon Dioxide And Its Research Process

Carbon dioxide, the main greenhouse gases, has manyadvantages f.e. large reserves, safe and inexpensive et.al. Synthesis ofcyclic carbonate is a successful and typical resource utilization ofcarbon dioxide. Ethylene carbonate (EC), an organic chemical withimportant applications, could be synthesized by catalytic cyclizingaddition reaction with ethylene oxide (EO) and carbon dioxide asmaterials, which is a eco-friendly and atom economic process route.Ionic liquid appears much advantages, such as low vapor pressure, lowtoxicity, good thermal stability, non-combustion, non-explosion anddistinvtive solubility, therefore, it has been played more attention toused in synthesize cyclic carbonates recently. A novel polymer ionicliquid (PMHS-HEVIMBr) was synthesized with bromide1-hydroxyethyl-3-vinyl imidazole, sodium methacrylate,2-hydroxyethylacrylate and styrene as monomers, and its structure was confirmed byFT-IR,1H-NMR, XPS, TG and elemental analysis. Solid particle catalystwas prepared by immobilizing the copolymer ionic liquid on themolecular sieve, and its surface characteristics analysised by BET andFESEM. The adsorption kinetics of PMHS-HEVIMBr on molecular sieve wascarried out, it is show that the molecular sieve had a lot of microporousand functional groups on the surface with a good adsorptivecapacity,while its mean size was0.7mm, the adsorption ofPMHS-HEVIMBr on molecular sieve in aqueous solution reachedequilibrium after24h at30℃, and the maximum adsorption amountreached400mg/g. Ethylene carbonate was synthesized byheterogenerous catalyst reaction of ethylene oxide and carbondioxide, using the solid partical catalyst and without organic solvents.Ethylene oxide conversion rate and ethylene carbonate selectivitywere evaluated by single-variable method, as functions of reaction time， temperature, pressure, catalyst concentration. The resultindicated that ethylene oxide conversion rate was95%and ethylenecarbonate selectivity was98%in the optimal conditions of reaction time4h, pressure2.5MPa, temperature130℃and catalyst mass ratio toethylene oxide9%. After ten times of recycle, the activity of the catalystwas no significant loss and ethylene carbonate selectivity was close to100%. The catalytic reaction process was researched by kinetic andthermodynamic method， and the kinetic equation were obtain,r=-dCEO/dt=9.872×104e-52.00/RTCEO, by means of regressing theexperimental results.