99%
623-53-0Relevant academic research and scientific papers
Zeolitic imidazolate framework as efficient heterogeneous catalyst for the synthesis of ethyl methyl carbonate
Zhou, Xi,Zhang, Hong Ping,Wang, Gong Ying,Yao, Zhi Gang,Tang, Ying Ran,Zheng, Shan Shan
, p. 43 - 47 (2013)
A zeolitic imidazolate framework (ZIF-8) was developed as a novel efficient heterogeneous catalyst for the synthesis of ethyl methyl carbonate from dimethyl carbonate and diethyl carbonate. ZIF-8 was characterized by element analysis, X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR), temperature programmed desorption (TPD), N2 adsorption-desorption and thermogravimetric analysis. The effects of catalyst amount, temperature and reaction time on the yield of ethyl methyl carbonate were also tested. The results showed that ZIF-8 performed excellent activity, selectivity and reusability under mild reaction conditions.
Efficient porous carbon-supported MgO catalysts for the transesterification of dimethyl carbonate with diethyl carbonate
Zhao, Guoming,Shi, Jinghui,Liu, Gang,Liu, Yan,Wang, Zhenlu,Zhang, Wenxiang,Jia, Mingjun
, p. 32 - 37 (2010)
Well-dispersed carbon-supported MgO catalysts were prepared using a kind of porous carbon (NC-2) as support and magnesium nitrate solution as MgO precursor by a simple wet impregnation technique. Various characterization techniques, including XRD, N2 sorption, DRIFT, XPS and TPD, were carried out to investigate their physical-chemical properties, the states of MgO species and the interaction between MgO and NC-2 materials. The catalytic properties of MgO/NC-2 catalysts were investigated in the liquid-phase transesterification of dimethyl carbonate (DMC) with diethyl carbonate (DEC). Compared with other kinds of carbon-supported MgO catalysts, MgO/NC-2 shows remarkably higher activity for the formation of ethyl methyl carbonate (EMC). Moreover, the NC-2 supported catalyst possesses very high stability against leaching of active species under test reaction conditions, indicating the truly heterogeneous nature of this catalyst. The presence of relatively rich oxygen-containing surface groups on the NC-2 carbon support should be in favor of the high dispersion of MgO particles, thus being beneficial to the fabrication of active and stable heterogeneous catalysts for the transesterificaiton reaction.
Amorphous mesoporous aluminophosphate as highly efficient heterogeneous catalysts for transesterification of diethyl carbonate with dimethyl carbonate
Shi, Jinghui,Liu, Gang,Fan, Zhiqiang,Nie, Liying,Zhang, Zhihui,Zhang, Wenxiang,Huo, Qisheng,Yan, Wenfu,Jia, Mingjun
, p. 721 - 725 (2011)
The catalytic performance of an amorphous mesoporous aluminophosphate (AlPO) was investigated for the transesterification of diethyl carbonate (DEC) with dimethyl carbonate (DMC) to synthesize ethyl methyl carbonate (EMC). Compared with other solid acid a
Magnesium aluminum spinel as an acid-base catalyst for transesterification of diethyl carbonate with dimethyl carbonate
Wang, Jun,Han, Lu,Wang, Shuping,Zhang, Jingcai,Yang, Yanzhao
, p. 1602 - 1608,7 (2014)
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
Zeolitic imidazole framework-67 as an efficient heterogeneous catalyst for the synthesis of ethyl methyl carbonate
Yang, Lili,Yu, Lin,Sun, Ming,Gao, Cheng
, p. 86 - 90 (2014)
Zeolitic imidazole framework (ZIF)-67, a novel environmentally benign catalyst, was developed for the preparation of ethyl methyl carbonate (EMC) from dimethyl carbonate and diethyl carbonate. EMC was obtained in 83.39% yield using ZIF-67 as the catalyst when compared to that obtained using ZIF-8 catalyst. NH3 and CO2 temperature-programmed desorption methods were used to evaluate the presence of both acidic and basic sites in ZIF-67 catalyst. The lager surface area of ZIF-67 favors for the adsorption of reactants over the solid surface of the catalyst, facilitating the formation of EMC. Moreover, ZIF-67 catalyst exhibited excellent reusability without significant loss in its catalytic activity.
Binary Mg-Fe oxide as a highly active and magnetically separable catalyst for the synthesis of ethyl methyl carbonate
Wang, Peixue,Liu, Shimin,Ma, Xiangyuan,He, Yude,Alshammari, Ahmad S.,Deng, Youquan
, p. 25849 - 25856 (2015)
Magnetic binary Mg-Fe oxides were prepared by a co-precipitation method, characterized and tested in the synthesis of ethyl methyl carbonate (EMC) from di methyl carbonate (DMC) and diethyl carbonate (DEC). The obtained results showed that the Mg/Fe oxide catalyst with a 1:1 molar ratio and calcined at 400 °C exhibited superior catalytic activity. The yield of EMC could reach 66% (at 100 °C for 1.5 h) with a TOF of 220 mmol h-1 gcat-1. The prepared catalysts could be magnetically separated, and reused for ten runs without noticeable deactivation. XRD and M?ssbauer spectra revealed that there was a synergistic effect between Mg and Fe oxides in the catalysts, which was consistent with the results of TPR, i.e. the introduction of the Mg component favored the reduction of the Fe2O3. XPS and IR characterizations indicated that there were a large number of accessible Fe-OHs on the surface of MgFe-400, and combining the Fe-OHs with the basic MgO may be related to the highly catalytic performance.
Mg and Al dual-metal functionalized mesoporous carbon as highly efficient heterogeneous catalysts for the synthesis of ethyl methyl carbonate
Cui, Yunzuo,Hao, Xiyun,Lin, Yanan,Liu, Chunling,Shi, Jinghui,Wang, He,Xue, Xiangxin,Zhang, Zhihui
, p. 21199 - 21205 (2021/12/09)
Mg and Al dual-metal functionalized nanoscale porous carbon materials (MgAl@NC) with highly ordered mesoporous structures and mixed active sites were successfully prepared using a simple one-pot synthesis method. The catalytic properties of the resultant MgAl@NC catalysts were investigated for the synthesis of ethyl methyl carbonate (EMC) in a fixed bed reactor. The catalysts exhibited remarkably high activity, selectivity and stability for the transesterification of diethyl carbonates (DEC) with dimethyl carbonates (DMC) even under high LHSV conditions. A 50.0% DEC conversion and a 99.2% EMC selectivity could be obtained at 103 °C and an LHSV = 7.8 h-1. The catalyst maintained a high product yield with almost no decrease in catalytic performance after 360 h. The well-dispersed magnesium aluminate spinel and α-cristobalite formed neighboring acid-base sites, while the synergistic catalytic effects of the mixed active sites should be critical for activation of the reactants. It may also be the reason for the efficient production of EMC under very high LHSV conditions.
Room temperature and normal pressure preparation method of organic carbonate
-
Paragraph 0064-0066, (2020/07/15)
The invention relates to the technical field of organic synthesis, and provides a room temperature and normal pressure preparation method of organic carbonate. The method comprises the following steps: introducing carbon dioxide into an imidazole ionic liquid to obtain a mixture; mixing the obtained mixture with alcohol and halogenated hydrocarbon, and carrying out addition-substitution reactionsto obtain organic carbonate. The whole reaction process is carried out at a room temperature under a normal pressure. The activation energy of the reaction is reduced by using imidazole ionic liquid and halogenated hydrocarbon, and finally, organic carbonate is prepared from CO2 at a room temperature under a normal pressure.
Method for synthesizing organic carbonate from carbon dioxide, alcohol and brominated alkane under mild conditions
-
Paragraph 0016-0017; 0021, (2020/06/02)
The invention discloses a method for synthesizing organic carbonate from carbon dioxide, alcohol and brominated alkane under mild conditions, belonging to the field of chemical synthesis. According tothe method, carbon dioxide, alcohol and brominated alkane are used as raw materials, 1,8-diazabicycloundec-7-ene (DBU) is used as an activating agent, and acetonitrile is used as a solvent to preparethe organic carbonate. The target product, namely the organic carbonate with excellent yield can be obtained under optimized reaction conditions. The method is mild in reaction conditions, simple andconvenient to operate and high in yield, and is an excellent system for preparing the organic carbonate.
Method for synthesizing aryl pyrazonitrile and by-producing carbonic acid diester
-
Paragraph 0008; 0029; 0032-0033, (2020/05/01)
The invention discloses a method for synthesizing aryl pyrazonitrile and by-producing carbonic acid diester. The method comprises the steps: taking 2,6-dichloro-4-trifluoromethylaniline, 2,3-dicyanopropionate and nitrite as main raw materials, carrying out diazotization and coupling reaction in a solvent containing fatty alcohol, adding a reaction terminating agent after coupling, and then carrying out alcoholysis and cyclization under an alkaline condition to generate aryl pyrazonitrile and carbonic acid diester. Different raw materials and process conditions are selected, the quality and theyield of the aryl pyrazonitrile are not influenced, and the generated by-product is purposefully controlled, so that after the cyclization liquid for synthesizing aryl pyrazonitrile is distilled andseparated, the distillate is subjected to multi-stage rectification, and solvents (methanol, ethanol or propanol and the like) can be recycled; meanwhile, carbonic acid diester of which the quality meets the industrial standard is obtained, and reduction and resource utilization of aryl pyrazonitrile synthesis waste liquid are realized.
