Reaction System Research In Synthesis Of Dimethyl Carbonate By Transesterification Of Ethylene Carbonate

In this paper,the process of a synthesis of dimethyl carbonate through transesterification of ethylene carbonate and methanol was investigated at first.By analysing the reason of catalyst deactivation,it aimed to find a new alternative catalyst.Three parameters were taken into consideration including catalytic activity,solubility in methanol,and decomposition temperature in screening the catalysts.At last,a suitable catalyst was chosen.By using the new catalyst,the transesterification process of ethylene carbonate reacting with methanol and ethanol respectively was studied in a batch reactor.The effects of different reaction parameters such like reaction temperature,mole ratio of methanol to ethylene carbonate,catalyst concentration,and reaction time on the transesterification reaction were discussed in order to determine the optimum reaction condition.The kinetics and thermodynamics of the two reactions was also studied.By measuring the concentration of each component,the chemical equilibrium constant in different temperatures was obtained.The van’t Hoff equation was obtained from the lnK-1/T plot.In the study of reaction kinetics,the mechanism of the new catalyst was researched and a kinetic model was proposed based on the reaction mechanism.The optimal model parameters were estimated by the Runge-Kutta and least square method.The process of synthesizing methyl triethylammonium methyl carbonate from triethylamine and dimethyl carbonate as raw materials and methanol as solvent was researched.The influences of reaction temperature,mole ratio of triethylamine to dimethyl carbonate,and reaction time was investigated so as to determine the optimum reaction condition.