Abstract
An in-situ dehydrating system built in a continuous flow fixed-bed bubbling reactor for direct synthesis of dimethyl carbonate (DMC) was designed. 3A molecular sieve (MS) was selected as the ideal dehydrating agent and the water trapping efficiency was studied. The effect of dehydrating agent/catalyst ratio, the dehydrating temperature and pressure, as well as the space velocity on the direct DMC synthesis catalyzed by K2O-promoted Cu–Ni was further investigated. These results demonstrated that 3A MS could effectively dehydrate the reaction system at the optimal conditions of 120 °C and 1.0 MPa with gas space velocity (GHSV) of 600 h−1, thereby greatly shifting the reaction equilibrium toward high DMC yield. Higher DMC yield of 13% was achieved compared with undehydrated reaction. Moreover, the catalyst can be highly stabilized by 3A MS dehydration with stable performs over 22 h.
Highlights
The environment-friendly dimethyl carbonate has aroused great interest in fuel additives, polar solvents, and methylating and carbonylating agents [1,2,3]
Summarize, theDehydration optimal condition is that of thethe mass ratio of 3/1 (3A molecular sieve (MS) and 15CN2K/diatomite), 2.3.4.To
The main reason for the deactivation of the catalyst is that the chemical environment of the active species on the surface of the catalyst changes after a period of catalytic reaction, which means that the active site of the catalyst is gradually deactivated during the reaction, resulting in a decrease in the yield of dimethyl carbonate (DMC)
Summary
The environment-friendly dimethyl carbonate has aroused great interest in fuel additives, polar solvents, and methylating and carbonylating agents [1,2,3]. 2, and molecular sieves due to high utilize physical absorption agents of water such as zeolites, CaCl the formed DMC, the high bond energy of CO2 , the reversible nature of the reaction, and the inability operating temperatures andagents pressures, butsuch no as report hadCaCl addressed these problems. The reaction dehydrating agent can enhance the yield of DMC by shifting the equilibrium toward higher is nonspontaneous (Equation (1)) and the reaction equilibrium is quickly established, the dehydrating yields.can enhance the yield of DMC by shifting the equilibrium toward higher DMC yields For batch such as trimethyl orthoacetate [21], [21], 2,2For batch reaction, reaction, the thedehydrating dehydratingadditives additives such as trimethyl orthoacetate dimethoxypropane [22], acetonitrile [23], butylene oxide [24], and a recyclable dehydrating tube.
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