Catalyzed synthesis of propylene carbonate from CO2 and propylene oxide by microinterface reaction intensification technique
The microinterface intensified batch and continuous processes for synthesis of propylene carbonate from CO2 and propylene oxide were established by using ionic liquid catalyst.The type of ionic liquid catalyst was optimized,and the gas-liquid system characteristic parameters of MIR(microinterface intensified reactor)and BCR(bubble column reactor)were observed by online measuring and imaging system.The reaction efficiency of the two reactors under different reaction conditions was compared,and the effect of mass transfer enhanced on PC yield was discussed.The results show that compared with BCR,MIR can control gas-liquid interface scale of the reaction system from mm-cm level to μm level,which greatly improves the phase interface areas and mass energy transfer efficiency,resulting in a 77％increase in reaction rate and a 40％increase in CO2 utilization under the same batch reaction condition.Under relatively mild conditions(110℃,2 MPa),catalyst dosage(molar fraction)0.375％,space time 3.3 h,n(CO2)∶n(PO)=1.25∶1,the PC yield is stable above 98％.The research results provide data support for the application of microinterface intensification reaction technology in the industrial production of PC.
microinterface intensified reactorpropylene carbonateCO2gas-liquid system characteristicsmass transfer intensification
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