Synthesis of cyclic carbonic ester

A technology of cyclic carbonate and synthesis method, which is applied in clean catalysis and green fields, can solve the problems of harsh reaction conditions, low stability, and low catalytic activity, and achieve convenient preparation, good thermal stability, and high catalytic activity. Effect

Inactive Publication Date: 2006-08-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The currently reported catalysts for the production of cyclic carbonates mainly include: alkali metal halides, alkaline earth metal halides, organic bases, quaternary ammonium salts, imidazolium salts, metal oxides, transition metal complexe

Method used

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  • Synthesis of cyclic carbonic ester
  • Synthesis of cyclic carbonic ester
  • Synthesis of cyclic carbonic ester

Examples

Experimental program
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Effect test

Example Embodiment

[0026] Example 1

[0027]

[0028] Implementation method: In a 100ml stainless steel autoclave, add 0.0875mmol of zinc bromide, 0.35mmol of 1,2-bis(methylimidazole)ethane bromide, and finally add 20ml of propylene oxide (1a), and seal the reaction vessel. , Fill in the right amount of carbon dioxide, control the temperature by the temperature controller to slowly increase the temperature to 120℃, then control the carbon dioxide pressure to 1.5MPa, react for 1 hour, cool to room temperature, unload the kettle, and wait for the excess carbon dioxide to be absorbed with saturated sodium carbonate solution. The obtained liquid was distilled under reduced pressure to obtain the product propylene carbonate (2a), which was weighed and the yield was calculated. After color mass spectrometry and nuclear magnetic analysis, the purity of the product is greater than 99.0%, the separation yield is preferably 98.0%, and the selectivity is greater than 99.0%.

Example Embodiment

[0029] Example 2

[0030] As in Example 1, the binary catalyst system used was zinc chloride and 1,2-bis(methylimidazole)ethane bromide to obtain propylene carbonate (2a). The selectivity was 99.0% and the yield was 96%.

Example Embodiment

[0031] Example 3

[0032] As in Example 1, the binary catalyst system used was zinc iodide and 1,2-bis(methylimidazole)ethane bromide to obtain propylene carbonate (2a). The selectivity is 99.0% and the yield is 99.5%.

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Abstract

Synthesis of cyclic carbonic acid ester is carried out by taking epoxide and carbon dioxide as raw materials without organic solvent, utilizing binary catalyst with transition metal salt and bidentate ionic liquid, cycloaddition reacting at 313.15-483.15K and 0.1-5.0Mpa and synthesizing cyclic carbonic acid ester. It is simple and clean, has higher recovery rate and selectivity and can be re-used.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, in particular to a method for synthesizing carbonates by cycloaddition reaction of carbon dioxide and epoxy compounds. Background technique: [0002] Carbon dioxide is a greenhouse gas and an inexhaustible C1 resource. The effective fixation of carbon dioxide has become one of the most challenging issues in this century, and the synthesis of cyclic carbonate is one of the best ways to fix it. . Cyclic carbonate is a very good polar solvent, and it has been widely used in the synthesis of pharmaceutical and fine chemical intermediates. Especially recently, the economic value and industrial demand of using ethylene carbonate as raw material to prepare carbonic acid diester and reacting with water to synthesize ethylene glycol by transesterification with methanol are increasing. In recent years, research on this aspect has received more and more attention. [0003] The currentl...

Claims

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Application Information

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IPC IPC(8): C07D317/34B01J31/02
Inventor 张锁江孙剑张香平成卫国李增喜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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