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Method of synthesizing circularity carbonic acid ester containing water or moisture architecture

A technology of cyclic carbonate and synthesis method, applied in clean catalysis and green fields, can solve the problems of low catalytic activity, harsh reaction conditions, low stability, etc.

Active Publication Date: 2008-01-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] Currently reported catalysts for the production of cyclic carbonates include: alkali metal halides, alkaline earth metal halides, organic bases, quaternary ammonium salts, imidazolium salts, solid bases (such as metal oxides), transition metal complexes, tetradentate Schiff base metal complexes, crown ethers, molecular sieves, etc., these catalytic systems have more or less problems such as low catalytic activity, low stability, and reaction conditions Harshness, use of highly toxic organic solvents, high cost of catalysts, etc., and most of the reaction systems are anhydrous conditions

Method used

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  • Method of synthesizing circularity carbonic acid ester containing water or moisture architecture
  • Method of synthesizing circularity carbonic acid ester containing water or moisture architecture
  • Method of synthesizing circularity carbonic acid ester containing water or moisture architecture

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Experimental program
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Effect test

Embodiment 1

[0029]

[0030] Implementation method: In a 100ml stainless steel autoclave, add potassium iodide 0.058mmol, 1,2-dimethyl imidazolium bromide 0.7mmol, 3.9g water in sequence, and finally add 15ml propylene oxide (1a), seal the reaction kettle, and fill it with For carbon dioxide with an appropriate amount of pressure, the temperature is slowly raised to 120°C by a temperature controller, and then the pressure of carbon dioxide is controlled to 2.0MPa, reacted for 1.0 hour, cooled to room temperature, unloaded, and the excess carbon dioxide is absorbed with saturated sodium carbonate solution, and the obtained liquid is reduced. Products (2a) and (3a) were obtained by pressure distillation. According to gas chromatography analysis, the selectivity of product (2a) was 98.0%, and the yield was 85.0%.

Embodiment 2

[0032] Same as in Example 1, the catalyst used is 0.7 mmol of 1,2-dimethyl imidazolium bromide, and the others remain unchanged, to obtain (2a) with a selectivity of 98.5% and a yield of 80.0%.

Embodiment 3

[0034] Same as in Example 2, the catalyst used is 0.7 mmol of 1,2-ditriphenylphosphine bromide, and the others remain unchanged, to obtain (2a) with a selectivity of 99.0% and a yield of 86.0%.

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Abstract

The invention relates to a synthetic method of the cyclic carbonate with water system, which is characterized in that: in the water system with water content 0 per cent to 60.0 per cent of the weight of the epoxy compound and water, the epoxy compound and the carbon dioxide work as the raw materials and the ionic liquid with double teeth and alkali metal salt (capable of excluding) are used as the catalysts during reaction and the cyclic carbonate is synthesized under the condition of reaction pressure of 0.1MPa to 10.0MPa, temperature of 313.15K to 483.15K and the reaction time of 0h to 6h. Compared with the traditional method, the synthetic method has the advantages of friendly environment, moderate reaction condition, stable catalyst heat, low cost, easy synthesis, high selectivity, repeated use and high activity maintenance and has strong industrial application prospect.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, in particular to a method for synthesizing carbonate from carbon dioxide and epoxy compounds through cycloaddition reaction in an aqueous system. Background technique: [0002] Carbon dioxide is a greenhouse gas and an inexhaustible C1 resource. Its effective fixation has become one of the most challenging issues in this century, and the synthesis of cyclic carbonates 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. In particular, the economic value and industrial demand for the preparation of dimethyl carbonate and the synthesis of ethylene glycol from ethylene carbonate as raw materials are increasing. In recent years, research in this area has received more and more attention. [0003] The currently reported catalysts for the production of cyclic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/26B01J31/02B01J27/236B01J27/053B01J27/06B01J27/08
Inventor 张锁江孙剑成卫国孟震英李增喜王蕾
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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