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Carboxyl-functionalized pyrazole ionic liquid, synthesis method and method for catalytically synthesizing cyclic carbonate with it

A technology for cyclic carbonates and pyrazoles, applied in the field of ionic liquid synthesis and application, can solve the problems of complex synthesis process, harsh reaction conditions, toxicity and the like, and achieves high catalyst activity, mild catalytic conditions and simple synthesis process. Effect

Active Publication Date: 2021-08-27
HENAN UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve technical problems such as the use of toxic organic solvents, expensive catalysts, complex synthesis processes, and harsh reaction conditions in the existing methods for synthesizing cyclic carbonates, and provides a carboxyl-functionalized pyrazole-based ionic liquid. Method and the method of using it to catalyze the synthesis of propylene carbonate

Method used

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Examples

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Embodiment Construction

[0020] The technical solutions of the present invention will be further described in detail below in conjunction with the examples, but the protection scope of the present invention is not limited thereto.

[0021] The following tests one to four give the carboxyl functionalized pyrazole ionic liquid 1-carboxymethyl-2-methylpyrazole bromide, 1-carboxyethyl-2-methylpyrazole bromide, 1-carboxypropyl Base-2-methylpyrazole bromide, 1-carboxybutyl-2-methylpyrazole bromide, 1-carboxymethyl-2-ethylpyrazole bromide, 1-carboxyethyl-2-ethyl The preparation process of pyrazole bromide, 1-carboxypropyl-2-ethylpyrazole bromide, and 1-carboxybutyl-2-ethylpyrazole bromide.

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Abstract

The present invention relates to a carboxyl functionalized pyrazole ionic liquid, characterized in that the structural formula is as follows: wherein, n = 1, 2, 3 or 4, R 1 =CH 3 or CH 2 CH 3 . The invention also discloses a method for using the ionic liquid to catalyze the synthesis of cyclic carbonates: using epoxy compounds and CO 2 As a raw material, use this kind of pyrazole ionic liquid as a catalyst, and react for 1-24 h under the conditions of 1.0-3.5 MPa and 60-120 ° C. The invention has the advantages of simple synthesis process, high catalyst activity, mild catalytic conditions, environmental protection, no use of other solvents and co-catalysts, no metal in the catalyst, and the like.

Description

technical field [0001] The invention belongs to the technical field of ionic liquid synthesis and application, and in particular relates to a carboxyl-functionalized pyrazole ionic liquid, a synthesis method and a method for catalyzing the synthesis of propylene carbonate with the same. Background technique [0002] The depletion of fossil fuels and the dramatic deterioration of the environment are two critical issues facing the world. CO 2 It is the main gas of greenhouse effect, and its main source is the burning of fossil fuels. With the development and progress of the economy, the excessive use of fossil fuels has caused the adverse effects of the greenhouse effect to expand day by day. How to effectively control CO in the atmosphere 2 To reduce its impact on the greenhouse effect and improve the earth's environment has become one of the major environmental issues that humans need to solve in the new century. In this situation, the effective capture and fixation of C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02C07D317/36
CPCB01J31/0282B01J2231/341C07D317/36
Inventor 任铁钢张景顺张敬来王丽黎桂辉
Owner HENAN UNIVERSITY