نتایج جستجو برای: Dimethyl carbonate

تعداد نتایج: 50906  

Journal: :Bioresource technology 2009
Zul Ilham Shiro Saka

In this study, the non-catalytic supercritical method has been studied in utilizing dimethyl carbonate. It was demonstrated that, the supercritical dimethyl carbonate process without any catalysts applied, converted triglycerides to fatty acid methyl esters with glycerol carbonate and citramalic acid as by-products, while free fatty acids were converted to fatty acid methyl esters with glyoxal....

Journal: :Journal of Synthetic Organic Chemistry, Japan 1993

2016
Zul Ilham Shiro Saka

Conversion of glycerol from biodiesel production to glycerol carbonate was studied by esterification with dimethyl carbonate in a non-catalytic supercritical condition. It was found that in a non-catalytic supercritical condition, glycerol at higher purity gave higher yield of glycerol carbonate at 98 wt% after reaction at 300 °C/20-40 MPa/15 min. The yield of glycerol carbonate was observed to...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2013
xiaojun guo rong zhang li zhang jun yan

so42-/zno-tio2 catalyst was prepared by sulfating zno-tio2 powders with h2so4 solution. the catalyst was characterized by xrd, ir and hammett indicator. the catalyst showed strong acidity(h0 ≦-16.0). the optimum conditions are found that the calcination temperature is 823k and the soaked consistency of h2so4 is 1 mol/dm3. then so42-/zno-tio2 was applied as the catalyst in the catalytic synthesi...

2010
F. J. Lovas

0022-2852/$ see front matter 2010 Elsevier Inc. A doi:10.1016/j.jms.2010.08.006 ⇑ Corresponding author. Fax: +1 301 869 5700. E-mail address: [email protected] (F.J. Lovas). Geometry optimization calculations on 13 members of the C3H6O3 family of organic species have been carried out to determine their relative binding energies. Dimethyl carbonate [(CH3)2CO3] is one of the lower energy species in ...

Journal: :Canadian Journal of Chemistry 1956

2014
Adrián Ochoa-Terán Leticia Guerrero Ignacio A. Rivero

A simple and efficient microwave-assisted methodology for the synthesis of 4-substituted-3-methyl-1,3-oxazolidin-2-ones from amino alcohols catalyzed by a ionic liquid was developed. This novel one-pot and one-step cyclization-methylation reaction represents an easier and faster method than any other reported protocols that can be used to obtain the desired products in good yields and high puri...

2012
Cinzia Chiappe Sunita Rajamani

Glycerol carbonate is a key multifunctional compound used as solvent, additive, and building block in alternative chlorine-free processes. Here, we report the synthesis of glycerol carbonate from renewable materials (glycerol and dimethyl carbonate, DMC) using basic ionic liquids (ILs) as catalysts. After process optimization, it has been possible to isolate pure glycerol carbonate in quantitat...

Journal: :Physical chemistry chemical physics : PCCP 2013
Yongli Shen Qingsen Meng Shouying Huang Jinlong Gong Xinbin Ma

Density functional theory (DFT) calculations have been used to investigate the oxidative carbonylation of methanol on Pd(II)/β zeolite. Activation energies for all the elementary steps involved in the commonly accepted mechanism, including the formation of dimethyl carbonate, methyl formate and dimethoxymethane, are presented. Upon conducting the calculations, we identify that the Pd(2+) cation...

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