623-96-1Relevant academic research and scientific papers
Synthesis of dipropyl carbonate over calcined hydrotalcite-like compounds containing la
Ma, Qingxiang,Zhao, Tiansheng,Wang, Ding,Niu, Wenqi,Lv, Peng,Tsubaki, Noritatsu
, p. 142 - 148 (2013)
Dipropyl carbonate (DPC) was selectively synthesized via transesterification of dimethyl carbonate (DMC) and n-propanol over Mg-Al composite oxide containing La catalysts. The catalysts were prepared by calcining the precursors of hydrotalcite-like compounds (HTLcs) from co-precipitation method. The effect of La content (nMg:n Al:nLa = 3:1:x) in the catalyst on the synthesis of DPC was investigated. And the catalyst exhibited the highest catalytic activity when x was tuned to 0.7. Under the optimized reaction conditions, the DMC conversion and DPC selectivity were 98.4% and 95.4%, respectively. These catalysts were characterized by thermogravimetry differential thermal analysis (TG-DTA), X-ray diffraction (XRD), nitrogen adsorption-desorption, Fourier transform infrared (FT-IR), temperature programmed desorption with CO2 (CO 2-TPD) and scanning electron micrograph (SEM). It was clarified that the amount of basic sites of moderate strength, formed by chelating bidentate carbonate, was enhanced with the La content increasing until x = 0.7, which were the catalytically-active sites for this reaction. But when La content x reached 1.0, these sites were transformed to bridging bidentate carbonate, leading to a loss of the catalytic activity to some extent. These findings indicated that La content controlled the catalytic performance of the composite oxides catalysts via structure change of the basic sites. The catalyst was easily prepared and handled, easily separated from the reaction medium and could be reused many cycles.
METHOD FOR PRODUCING CARBONATE ESTERS, AND CATALYTIC STRUCTURE FOR PRODUCING CARBONATE ESTERS
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Paragraph 0148-0149; 0179-0180, (2021/09/17)
Provided are a method for producing carbonate esters, and a catalytic structure for producing carbonate esters, whereby solid catalyst powder formation and detachment are suppressed and superior carbonate ester reaction efficiency is yielded when a catalytic structure constituted by a sufficient quantity of a cerium-oxide-containing solid catalyst supported on a substrate is used. The method for producing carbonate esters includes reacting a monohydric alcohol and carbon dioxide in the presence of a catalytic structure and a hydrating agent. The catalytic structure includes a substrate and a catalytic layer that is formed on at least a portion of the surface of the substrate and contains a solid catalyst and an inorganic binder. The solid catalyst contains cerium oxide. The supported quantity of the solid catalyst is 15 g/m2 to 200 g/m2, inclusive. The inorganic binder contains silica and/or alumina.
Boosting the methanolysis of polycarbonate by the synergy between ultrasound irradiation and task specific ionic liquids
D'Anna, Francesca,Sbacchi, Maria,Infurna, Giulia,Dintcheva, Nadka Tz.,Marullo, Salvatore
supporting information, p. 9957 - 9967 (2021/12/24)
In an attempt to perform polycarbonate chemical recycling in a more sustainable way, we took into consideration the combined use of ultrasound irradiation and task specific ionic liquids. Towards this aim, the methanolysis of polycarbonate, into dimethylcarbonate and bisphenol A, was carried out in the presence of cholinium-based ionic liquids featuring anions derived from amino acids and other eco-friendly species. The target process was optimized in terms of both energy and material amounts as well as in terms of the nature of the catalysts used. The proposed protocol allowed high conversion and yields of bisphenol A to be obtained, under milder conditions compared to the ones so far reported in the literature, perfectly fulfilling green chemistry principles. The best performing catalyst can be reused without significant loss in performance and the methodology can be successfully applied to post-consumer polycarbonate samples. This journal is
Method for synthesizing organic carbonate from carbon dioxide, alcohol and brominated alkane under mild conditions
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Paragraph 0016-0017; 0018-0020; 0022; 0024, (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.
Room temperature and normal pressure preparation method of organic carbonate
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Paragraph 0082-0084, (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 of manufacturing Dialkyl carbonate using carbon dioxide
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Paragraph 0073-0079; 0088; 0149-0151, (2019/08/12)
In the embodiment of the present invention consists of a carbon dioxide using the d alkyl car this [thu [thu] which it sees a manufacturing method is provided other [...] number one, alcohol, imidazolium cation and bicarbonate mixing negative catalyst and bases the solvent to form a mixture, said mixture by mixing said reactants including injecting carbon dioxide for generating an agitating the manufacturing method characterized in that the d alkyl car this [thu [thu] which it sees a number [...] substrate. (by machine translation)
Method for catalytic synthesis of dipropyl carbonate by electrode induction of carbon dioxide
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Paragraph 0012; 0028-0040, (2018/07/30)
The invention relates to a method for catalytic synthesis of dipropyl carbonate by electrode induction of carbon dioxide, and belongs to the field of new energy materials and green manufacturing. Thepurpose of the invention is to solve the problem of high equipment investment and low yield in the prior art. The method comprises the following steps: trapping and sealing carbon dioxide in a carbon-fixing solvent, carrying out electrode induction on the carbon dioxide on a copper electrode in a carbon-fixing solution by an electrode mode, then placing the induced and activated carbon dioxide into a reactor, adding n-propanol, carrying out a reflux reaction at 40-95 DEG C for 2-4 hours under the action of a catalyst, and carrying out separating and drying to obtain the dipropyl carbonate. Themethod can be used to reduce the emission of greenhouse gas in a large scale, is one of the most economical and feasible methods for slowing down global warming, and has the characteristics of environmental protection, non-toxicity, low requirements for production equipment and the like; high-pressure conditions or anti-corrosion conditions are not needed; and production safety is guaranteed.
Ureas as safe carbonyl sources for the synthesis of carbamates with deep eutectic solvents (DESs) as efficient and recyclable solvent/catalyst systems
Dindarloo Inaloo, Iman,Majnooni, Sahar
, p. 13249 - 13255 (2018/08/21)
A simple, efficient and eco-friendly one-pot synthesis of primary, N-mono- and N-disubstituted carbamates is developed from ureas. The corresponding carbamates were produced at 120 °C, within 18 h, and in the presence of a deep eutectic solvent as a recyclable catalytic system. The catalyst can be reused for several runs without any reduction in its activity. To demonstrate the utility of this approach, a wide variety of alcohols and phenols were studied to find a vast range of carbamate derivatives in moderate to high yields.
Method for preparing dialkyl carbonate by alcoholysis of urea
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Paragraph 0045, (2018/09/08)
The invention relates to a method for preparing dialkyl carbonate by alcoholysis of urea, belonging to the field of chemical synthesis. More specifically, the invention relates to preparation of dialkyl carbonate. The method comprises the following step: subjecting urea and alkyl monohydric alcohol to a reflux reaction under stirring for 6 to 30 hours under the condition of normal pressure or reduced pressure at a reaction temperature of 70 to 150 DEG C by using one or more selected from the group consisting of metal magnesium, calcium, aluminum, chromium, manganese, iron, cobalt, nickel, copper or zinc as a main catalyst and one or more compounds containing donor atom nitrogen, phosphorus, oxygen or sulfur as an auxiliary catalyst so as to prepare the dialkyl carbonate. The preparation method provided by the invention has the following advantages: the dialkyl carbonate is prepared with high selectivity and high yield at a low reaction temperature under the condition of normal pressureor reduced pressure; simple operation, high safety and low cost are achieved in the processing process; and good industrial application prospects are obtained.
Synthesis of Ditetrahydrofurfuryl Carbonate as a Fuel Additive Catalyzed by Aminopolycarboxylate Ionic Liquids
Huang, Wei,Tao, Duan-Jian,Chen, Feng-Feng,Hui, Wei,Zhu, Jia,Zhou, Yan
, p. 1347 - 1354 (2017/08/29)
Abstract: A new series of aminopolycarboxylate ionic liquids were designed, synthesized, and applied for efficient and selective synthesis of ditetrahydrofurfuryl carbonate (DTC). Tetraethylammonium nitrilotriacetate ([N2222]3[NTA]) was demonstrated to show the best catalytic performance, in which DTC could be obtained at a yield of 80% under optimum conditions. Graphical Abstract: [Figure not available: see fulltext.].
