The synthesis of ethyl methyl carbonate(EMC)by transesterification of dimethyl carbonate(DMC)and diethyl carbonate(DEC)in the presence of alkaline ionic liquids as catalysts was studied,in which alkaline ionic liquid 1-butyl-3-methylimidazolium butyrate([C4mim][CH3(CH2)2COO])was selected due to its good catalytic performance compared with other alkaline ionic liquids.The effects of reaction time,temperature,catalyst loading and molar ratio of reactants on the conversion of the DEC were examined.Under the su...