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Method for enabling novel low-eutectic ionic liquid to chemically fix carbon dioxide under normal pressure and temperature condition to synthesize cyclic carbonate

A technology of cyclic carbonates and ionic liquids, applied in chemical instruments and methods, preparation of organic compounds, physical/chemical process catalysts, etc., can solve the problems of harsh reaction conditions and low catalytic activity, and achieve low price and simple synthesis The effect of high efficiency and great development potential

Active Publication Date: 2019-07-05
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently reported catalytic conversion of CO 2 The eutectic ionic liquids for synthesizing cyclic carbonate generally include the following: choline chloride / urea, urea / zinc halide, choline chloride / acetic acid and choline chloride / polyethylene glycol, but there are still catalytic The problems of low activity and harsh reaction conditions have not been found. 2 Report on Synthesis of Cyclic Carbonates

Method used

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  • Method for enabling novel low-eutectic ionic liquid to chemically fix carbon dioxide under normal pressure and temperature condition to synthesize cyclic carbonate
  • Method for enabling novel low-eutectic ionic liquid to chemically fix carbon dioxide under normal pressure and temperature condition to synthesize cyclic carbonate
  • Method for enabling novel low-eutectic ionic liquid to chemically fix carbon dioxide under normal pressure and temperature condition to synthesize cyclic carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The synthesis of embodiment 1 novel deep eutectic ionic liquid

[0025] Prepared by adding tetrabutylphosphonium bromide (TBPB) and m-aminophenol (3-AP) into single-necked flasks at a molar ratio of 1:2, and heating and magnetically stirring at 50°C for 0.5 hours. TBPB / 3-AP was obtained. attached figure 1 The structure of TBPB / 3-AP was characterized by infrared; figure 2 The structure of TBPB / 3-AP was characterized by NMR; image 3 Infrared characterization of TBPB / 3-AP on CO 2 activation.

[0026] Methyltriphenylphosphonium bromide (MTPB) and p-aminophenol (4-AP) were added to a single-necked flask at a molar ratio of 1:3, heated and magnetically stirred at 50°C for 0.5 hours to prepare And get MTPB / 4-AP.

[0027] Allyltriphenylphosphonium bromide (ATPB) and o-aminophenol (2-AP) were added to a single-necked flask at a molar ratio of 1:2, heated and magnetically stirred at 50°C for 0.5 hours, Prepared to obtain ATPB / 2-AP.

[0028] Benzyltriphenylphosphonium br...

Embodiment 2

[0030] Get the catalyst TBPB / 3-AP prepared in Example 1 and the reactant epichlorohydrin and add 100mL successively to connect CO 2 The Schlenk (Schlenk) reaction flask of balloon, wherein, epichlorohydrin 10mmol, TBPB-NHS 0.8mmol, catalyst accounts for epichlorohydrin molar content and is 8mol%, decompression gets rid of the air remaining inside; Reaction flask and CO 2 Balloon connected, at a reaction temperature of 25°C, 0.1MPa CO 2 Under pressure conditions, the reaction continued for 24 hours; after the reaction, the product was quantitatively analyzed by gas chromatography, and the corresponding product yield was 96%, and the selectivity was 99%.

Embodiment 3

[0032] The specific experimental process and detection method are the same as in Example 2, the deep eutectic ionic liquid is changed to the MTPB / 4-AP prepared in Example 1, the catalyst consumption is changed to account for 5mol% of the epichlorohydrin molar content, and the reaction time is changed to 12 hours, the corresponding product yield is 83%, and the selectivity is 99%.

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Abstract

The invention relates to a method for enabling novel low-eutectic ionic liquid to chemically fix carbon dioxide under the normal pressure and temperature condition to synthesize cyclic carbonate. Themethod includes the steps that the carbon dioxide and different substituent epoxy compounds serve as raw materials, the novel low-eutectic ionic liquid formed by synthesizing quaternary phosphonium bromide salt and aminophenol according to the molar ratio of 1:2-1:3 serves as a catalyst, and the corresponding cyclic carbonate is synthesized under the conditions that the use amount of the catalystis 5%-10% of the molar ratio of the epoxy compounds, the reaction pressure is 0.1 MPa, the reaction temperature is 25 DEG C, and the reaction time is 12-24 hours. The novel low-eutectic ionic liquid is simple and efficient in preparation, the raw materials are cheap and easy to obtain, the catalytic performance is excellent, and high-selectivity synthesis of the cyclic carbonate at normal temperature and pressure can be achieved. Meanwhile, use of toxic transition metal, volatile organic solvents and co-catalysts is avoided, the catalyst is easily separated from the product, and the catalyst belongs to environment-friendly catalysts.

Description

technical field [0001] The invention relates to a method for chemically immobilizing carbon dioxide to synthesize cyclic carbonate under the condition of a new deep eutectic ionic liquid at normal temperature and pressure, belonging to CO 2 The field of clean resource utilization. Background technique [0002] Carbon dioxide (CO2) produced by burning fossil fuels is 2 ) of more than 13 billion tons per year, which seriously contributes to the problems of climate change and ocean acidification. The Intergovernmental Panel on Climate Change (IPCC) predicts that by 2100, the global average temperature will rise by 1.9°C. Therefore, it is imperative to reduce global greenhouse gas emissions. At the same time CO 2 It is also an environmentally friendly, abundant, cheap and renewable C1 resource, and the captured CO 2 Synthesizing chemicals with a wide range of uses and high added value through chemical conversion is of great significance from the perspective of environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/36C07D317/46C07F9/54C07C215/76C07C213/08B01J31/02
CPCC07D317/36C07D317/46C07F9/5407C07F9/5442C07C215/76C07C213/08B01J31/0288
Inventor 刘猛帅刘福胜顾永强赵鹏辉辛昊平冉
Owner QINGDAO UNIV OF SCI & TECH
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