Selective Synthesis of Ethyl Methyl Carbonate via Catalytic Reactive Distillation over Heterogeneous MgO/HZSM‐5

Abstract

Ethyl methyl carbonate is selective synthesized from dimethyl carbonate and ethanol via catalytic reactive distillation ( RD) over heterogeneous MgO/HZSM‐5. It is shown that 2.3%MgO/HZSM‐5 catalyst has high catalytic activity with 99.4% conversion of ethanol ( EtOH) and 98.1% selectivity to EMC, in a RD column. The prepared catalysts is characterized by XRD, SEM, N2 adsorption‐desorption CO2‐TPD and NH3‐TPD. The high performance of this catalyst is attributed to high basicity. According to the results of CO2‐TPD, this catalyst total basicity is 1.72 mmol/g. In order to optimize the catalytic reaction, the reaction conditions, such as amount of catalyst, reflux ratio and EtOH LHSV were studied.

One‐Pot Synthesis of Organic Carbonate from Alcohol and Alkyl Bromide under Low CO2 Pressure

“…Besides, transesterification of DMC with ethanol or DMC with diethyl carbonate (DEC) is considered a promising method for the synthesis of EMC. Therein, various homogeneous and heterogeneous catalysts have been developed, including ionic liquid, [24] TiO 2 nanofibers, [25] metal complex Co 2 (CO) 8 /W(CO) 6 , [26] KF/Al 2 O 3 , [27] carbonate phosphonium salts, [28] DBU, [29] MgO/HZSM-5, [30] Ti(OBu) 4 , Ti(OPh) 4 , Bu 2 SnO and BuSnCl 3 , [31] ZnÀ Co@N-doped carbon materials, [32] amorphous mesoporous aluminophosphate, [33] nitrogen-doped carbon/ ZnO [34] etc. However, these methods usually encounter with high reaction temperature, long reaction time, low production efficiency, poor atom economy, and challenge in the separation of products.…”