Methyl Ethyl Carbonate Synthesized By Alumina And Aluminum Magnesium

Ethyl Methyl Carbonate (EMC) is an environmentally and green benign asymmetric carbonic ester. There are methoxy (CH3O-), carbonyl (-CO-) and ethoxy (-CH3CH2O) in the molecular of EMC. In this case, the chemical property of EMC is very active, which was widely used as chemical intermediate. In addition, it’s physical property such as low viscosity, high dielectric constant and good solubility of lithium salts are attribute to improving the battery energy density, discharge capacity, safety performance and life span of lithium batteries. So far EMC has been used to be battery electrolyte. However, the product used as electrolyte solvent is mostly from abroad since its low purity in the domestic market. Therefore, the research of synthesis of EMC is very important and meanly.In the first part of this paper, we summarized all the roads to synthesis EMC and the catalysts involved, and we chose the reaction of catalyzing dimethyl carbonate (DMC) and diethyl (DEC) to synthesis EMC as our research contents after comparing all the articles published. We also analyzed the review of published catalysts, and we are working on preparing a good catalyst with excellent activity.First, we prepared the AI2O3 based catalyst materials, and AlCl36H2O, ammonium hydroxide and nitric acid are used as raw materials, we take advantage of oil ammonia column molding method preparing the granularity catalyst, which grain size is 1-2 mm. This material has good catalyst performance, and good selectivity. In this experiment catalyst types and dosages, feeding molar ratio, reaction time are studied and discussed, ultimately determine the synthesis process of methyl ethyl carbonate and optimized the related parameters of this synthesis process.In addition, we also prepared another catalyst which showed excellent catalyst performance, Mesoporous MgAl2O4 spinel (MAO), prepared via one-pot evaporation induced self-assembly strategy, was reported here as an acid-base bifunctionalization catalyst for the reaction for ethyl methyl carbonate from dimethyl carbonate and diethyl carbonate. The physical/chemical properties of MgAl2O4 were characterized by X-ray powder diffraction, N2 adsorption-desorption, tem-perature programmed desorption and Fourier transform infrared. The effects to the reaction by adjusting the cata-lyst amount and reaction time were tested. The transesterification induced by MAO is much faster, and meantime, the thermal stability of MAO is much higher. Moreover, the catalyst can be used directly after filtration without drying and reused for at least five times with only 1.2% loss in catalytic activity.