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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 complexes, and tetradentate Schiff alkali metal complexes. However, these catalyst systems have more or less problems such as low catalytic activity, low stability, harsh reaction conditions, use of highly toxic organic solvents, and high catalytic costs.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]

[0028] Implementation method: In a 100 ml stainless steel autoclave, add 0.0875 mmol of zinc bromide and 0.35 mmol of 1,2-bis(methylimidazolium) ethane bromide in sequence, and finally add 20 ml of propylene oxide (1a), and seal the reaction vessel , fill in carbon dioxide with an appropriate amount of pressure, and the temperature is slowly raised to 120°C controlled by the temperature controller, and then the pressure of carbon dioxide is controlled to 1.5MPa, reacted for 1 hour, cooled to room temperature, and unloaded. After the excess carbon dioxide is absorbed with saturated sodium carbonate solution, The resulting liquid was distilled under reduced pressure to obtain the product propylene carbonate (2a), which was weighed to calculate the yield. Through chromatography-mass spectrometry and NMR analysis, the product purity is greater than 99.0%, the separation yield is preferably 98.0%, and the selectivity is greater than 99.0%.

Embodiment 2

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

Embodiment 3

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