Method for synthesizing cricoid carbonate by addition reaction of carbon dioxide and epoxy compound ring

Abstract

The invention discloses a method for synthesizing cyclic carbonate by a cycloaddition reaction of carbon dioxide and epoxy-compound. The catalyzer is composed of metal-salt, ion liquid and quaternary ammonium salt. The cyclic carbonate is produced by catalyzing the carbon dioxide and epoxy-compound for a cycloaddition reaction under a reaction temperature of 30-200 DEG C, and a carbon dioxide pressure of 0.5-10 MPa. The reaction progress doesn't add any organic solvent. The purified cyclic carbonate by a simple purification may achieve a high purity more than 98%. The catalyzer can be reused and keeps an invariable activity. The catalyzer system has a high activity and low cost. The method can synthesize the cyclic carbonate quickly and highly selectively in a simple operation so than it will be a perfect industrial prospect.

Description

technical field [0001] The invention relates to a method for synthesizing cyclic carbonate from carbon dioxide and epoxy compound through cycloaddition reaction. Background technique [0002] Cyclic carbonate is an organic solvent with high boiling point and high polarity with excellent performance. It is used in desulfurization and decarbonization (CO 2 ) are widely used in the field. In recent years, the market demand for cyclic carbonates as intermediates of transesterification has surged. In particular, it was found that cyclic carbonate can be used as an excellent medium for high-energy batteries and capacitors, and the market demand for this alone is as high as 2-3 million tons. [0003] The synthesis methods of cyclic carbonates mainly include phosgene method, transesterification method and cycloaddition of carbon dioxide and epoxy compounds. Among them, the method for synthesizing cyclic carbonates by using carbon dioxide and epoxy compounds under the action of a ...

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Problems solved by technology

[0006] Chinese patent CN1432557A discloses a method of using tetraethylammonium bromide to catalyze the synthesis of ethylene carbonate. The method is above 130°C and the pressure of carbon dioxide is above 3MPa, and the conversion rate of ethylene oxide is above 95%. However, This method requires a large amount of ethylene carbonate as a reaction medium

[0010] However, these catalyst systems have more or less problems such as high cost, low activity, harsh reaction conditions, use of highly toxic organic solvents, and difficulty in separating the product from the catalyst.

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