Protonated alkylpyrazole ionic liquid and method for catalytically synthesizing cyclic carbonate using it

Abstract

The invention relates to protonated alkylpyrazole ionic liquid with a structural formula as shown in the description, wherein n is equal to 1, 2, 3 or 4, and X is Cl, Br or I. The invention further discloses a method for synthesizing cyclic carbonate by using the protonated alkylpyrazole ionic liquid; the protonated alkylpyrazole ionic liquid and an epoxy compound are added into a high-pressure reaction kettle according to a molar ratio of 1 : (25 to 300), CO2 is introduced until pressure is 1-3 MPa, and constant-temperature constant-pressure reaction is performed for 1-5 hours at a temperature of 100-150 DEG C, and post-treatment is performed after reaction is ended, thus obtaining the cyclic carbonate. The method solves the problems that CO2 activation is difficulty, a catalyst is dear, a poisonous organic solvent is used, a synthesis process is complex, reaction conditions are harsh and the like in an existing method. The advantages of simple synthesis process, high catalyst activity, environmental friendliness, low cost and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a protonated alkylpyrazole ionic liquid and a method for catalyzing and synthesizing a cyclic carbonate using it. Background technique [0002] Today, CO 2 The large amount of gas emissions has had a huge impact on the earth's environment, so the control of CO in the atmosphere 2 content, accelerate the CO 2 Effective use of research and ultimately mitigating its impact on climate change is one of the major challenges facing humanity in the new century. Therefore, in this situation, effective capture, fixation and conversion of CO 2 has become the current effective use of CO 2 research hotspots. [0003] CO 2 As a cheap and abundant renewable resource, the synthesis of cyclic carbonates via cycloaddition reaction and conversion of epoxides is one of the most promising approaches. Moreover, the reaction belongs to the "atom economy" type reaction, and ...

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Problems solved by technology

[0004] The purpose of the invention is in order to solve the CO existing in the method for existing synthetic carbonate 2 Difficult activation, low catalyst activity, expensive catalyst, complex synthesis process, use of toxic organic solvents, complex synthesis process and harsh reaction conditions and other technical problems provide a protonated alkylpyrazole ionic liquid and its catalytic Method for Synthesizing Cyclic Carbonates

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