Ultrasonic Process Intensification During the Preparation of Dimethyl Carbonate Based on the Alcoholysis of Ethylene Carbonate and the Kinetics Behaviors of Dimethyl Carbonate

2021 ◽  
Author(s):  
Yueyue He ◽  
Huaigang Cheng ◽  
Zihe Pan ◽  
Fangqin Cheng
Keyword(s):  
Heterogeneous Catalysis ◽  
Dimethyl Carbonate ◽  
Ethylene Carbonate ◽  
Process Intensification ◽  
Ultrasonic Process

The use of ultrasonic process intensification in the preparation of dimethyl carbonate (DMC) by alcoholysis of ethylene carbonate can make up for several disadvantages of heterogeneous catalysis, such as low...

scholarly journals Electrokinetic and Impedimetric Dynamics of FeCo-Nanoparticles on Glassy Carbon Electrode

Nano Hybrids ◽  
2013 ◽  
Vol 3 ◽  
pp. 1-23 ◽  
Author(s):  
Chinwe O. Ikpo ◽  
Njagi Njomo ◽  
Kenneth I. Ozoemena ◽  
Tesfaye Waryo ◽  
Rasaq A. Olowu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Transfer Process ◽  
Dimethyl Carbonate ◽  
Electrochemical Impedance ◽  
Ethylene Carbonate ◽  
Carbon Electrode ◽  
Electron Transfer Process ◽  
Feco Nanoparticles

The electrochemical dynamics of a film of FeCo nanoparticles were studied on a glassy carbon electrode (GCE). The film was found to be electroactive in 1 M LiClO4 containing 1:1 v/v ethylene carbonate dimethyl carbonate electrolyte system. Cyclic voltammetric experiments revealed a diffusion-controlled electron transfer process on the GCE/FeCo electrode surface. Further interrogation on the electrochemical properties of the FeCo nanoelectrode in an oxygen saturated 1 M LiClO4 containing 1:1 v/v ethylene-carbonate-dimethyl carbonate revealed that the nanoelectrode showed good response towards the electro-catalytic reduction of molecular oxygen with a Tafel slope of about 120 mV which is close to the theoretical 118 mV for a single electron transfer process in the rate limiting step; and a transfer coefficient (α) of 0.49. The heterogeneous rate constant of electron transfer (ket), exchange current density (io) and time constant (τ) were calculated from data obtained from electrochemical impedance spectroscopy and found to have values of 2.3 x 10-5 cm s-1, 1.6 x 10-4 A cm-2 and 2.4 x 10-4 s rad-1, respectively.

The preparation and efficacy of SrO/CeO2 catalysts for the production of dimethyl carbonate by transesterification of ethylene carbonate

Fuel ◽  
2018 ◽  
Vol 220 ◽  
pp. 706-716 ◽  
Author(s):  
Praveen Kumar ◽  
Ramanpreet Kaur ◽  
Shilpi Verma ◽  
Vimal Chandra Srivastava ◽  
Indra Mani Mishra
Keyword(s):  
Dimethyl Carbonate ◽  
Ethylene Carbonate

Computer simulation study of the solvation of lithium ions in ternary mixed carbonate electrolytes: free energetics, dynamics, and ion transport

2018 ◽  
Vol 20 (45) ◽  
pp. 28649-28657 ◽  
Author(s):  
Youngseon Shim
Keyword(s):  
Computer Simulation ◽  
Ion Transport ◽  
Simulation Study ◽  
Dimethyl Carbonate ◽  
Ethylene Carbonate ◽  
Lithium Ions ◽  
Computer Simulation Study ◽  
Mixed Carbonate

A ternary mixed carbonate electrolyte composed of ethylmethyl carbonate, dimethyl carbonate, ethylene carbonate, and Li+PF6− salt.

Benzo-Fused 1,4-Heterocycles via Dialkyl Carbonate Chemistry

Synthesis ◽  
2019 ◽  
Vol 51 (08) ◽  
pp. 1770-1778 ◽  
Author(s):  
Manuele Musolino ◽  
Fabio Aricò
Keyword(s):  
Dimethyl Carbonate ◽  
Ethylene Carbonate ◽  
Product Formation ◽  
Ring Closure ◽  
Organic Base ◽  
Reaction Conditions ◽  
Strong Base ◽  
Dialkyl Carbonates ◽  
Dialkyl Carbonate ◽  
Halogen Free

A novel halogen-free synthesis of benzo-fused six-membered 1,4-heterocycles through the chemistry of dialkyl carbonates is reported. Commercially available catechol, 2-aminophenol, and 2-amino­thiophenol were reacted first with ethylene carbonate in an autoclave to give O-hydroxyethyl, N-hydroxyethyl, and S-hydroxyethyl derivatives respectively, through a BAl2 mechanism. Then 2-(2-hydroxyethoxy)phenol and 2-(2-hydroxyethylamino)phenol were cyclized in excellent yields by reaction with dimethyl carbonate (DMC) and DABCO as a bi­cyclic organic base to give the corresponding benzodioxine and benzoxazine derivative, respectively. Moreover, 2-(2-aminophenylthio)ethanol afforded the benzothiazine derivative in good yield by reaction with DMC with an excess of a strong base such as NaH. The investigation on the cyclization reaction has highlighted that several equilibria are involved leading to the formation of carbonate and carbamate intermediates through BAc2 mechanisms. Depending on the reaction conditions employed, these intermediates may undergo either kinetic-controlled ring closure by a BAl2 mechanism or by-product formation.

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