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Method for preparing cyclic carbonate by reacting normal pressure carbon dioxide with epoxide

A cyclic carbonate, carbon dioxide technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, chemical/physical processes, etc., can solve problems such as high pressure and easy yellowing of products

Inactive Publication Date: 2015-04-08
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of method that utilizes normal pressure carbon dioxide and epoxide reaction to prepare cyclic carbonate for the high pressure in the existing cyclic carbonate production process, the product is easy to turn yellow etc., and this method uses Salen- Metal complexes and quaternary ammonium salts are used as catalysts to realize the preparation of carbonates under normal pressure; the catalyst synthesis steps are simple, the raw materials are cheap and easy to obtain, and the catalytic efficiency is high, which can be widely used in industrial production fields

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] A method for preparing cyclic carbonates by reacting carbon dioxide under normal pressure with epoxides, using propylene oxide as a substrate, propylene carbonate as a solvent, zinc bis-salicylaldehyde ethylenediamine acetal (Cat. 1) and Tetraethylammonium bromide is a two-component catalyst, which is reacted under normal pressure carbon dioxide to prepare cyclic carbonate, and the preparation steps are as follows:

[0024] 1) Mix propylene oxide, propylene carbonate, ethylenediamine zinc disalicylaldehyde (Cat. 1) and tetraethylammonium bromide in a sealed container, propylene oxide, propylene carbonate, salicyl The molar ratio of ethylenediamine zinc aldehyde (Cat. 1) to tetraethylammonium bromide is 1:1:0.001:0.01, and then carbon dioxide at normal pressure is introduced to react at a temperature of 150°C for 60 minutes.

[0025] The synthesis method of the zinc bis-salicylaldehyde ethylenediamine acetal (Cat. 1) has the following steps:

[0026] Dissolve 2.5 g of e...

Embodiment 2

[0030]A method for preparing cyclic carbonates by reacting carbon dioxide under normal pressure with epoxides, using propylene oxide as a substrate, propylene carbonate as a solvent, and condensing cyclohexanediamine zinc with disalicylaldehyde (Cat. 2) and tetraethylammonium bromide are two-component catalysts, and react under normal pressure carbon dioxide to prepare cyclic carbonates. The preparation steps are as follows:

[0031] 1) Mix propylene oxide, propylene carbonate, bisalicylaldehyde cyclohexamethylene diamine zinc (Cat. 2) and tetraethylammonium bromide in a sealed container, mix propylene oxide, propylene carbonate, dihydrate The molar ratio of zinc phenylaldehydecyclohexanediamine (Cat. 2) to tetraethylammonium bromide is 1:1:0.001:0.01, and then carbon dioxide at normal pressure is introduced into the reaction at 150 °C for 60 min to obtain reaction product.

[0032] The synthesis method of zinc bis-salicylaldehyde ethylenediamine acetal (Cat. 2) is basically ...

Embodiment 3

[0036] A method for preparing cyclic carbonates by reacting carbon dioxide and epoxides at atmospheric pressure, using propylene oxide as a substrate, propylene carbonate as a solvent, and zinc bis-salicylaldehyde acetal o-phenylenediamine (Cat. 3) and tetraethylammonium bromide are two-component catalysts, and react under normal pressure carbon dioxide to prepare cyclic carbonates. The preparation steps are as follows:

[0037] 1) Mix propylene oxide, propylene carbonate, zinc bis salicylaldehyde o-phenylenediamine (Cat. 3) and tetraethylammonium bromide in a sealed container, propylene oxide, propylene carbonate, dihydrate The molar ratio of salicylic aldehyde o-phenylenediamine zinc (Cat. 3) to tetraethylammonium bromide is 1:1:0.001:0.01, and then carbon dioxide is introduced into atmospheric pressure, and the temperature is 150°C for 60 minutes to obtain the reaction product.

[0038] The synthesis method of zinc bis-salicylaldehyde o-phenylenediamine acetal (Cat. 3) is ...

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Abstract

The invention relates to a method for preparing cyclic carbonate by reacting normal pressure carbon dioxide with epoxide. Propylene carbonate or ethylene carbonate is prepared by reaction under normal pressure carbon dioxide by taking epoxypropane or ethylene oxide as a substrate, corresponding propylene carbonate or ethylene carbonate as a solvent and Salen-Zn and tetraethyl ammonium bromide as a dual component catalyst, wherein the Salen-Zn is bissalicylaldehyde ethylenediamine-Zn, salicyladehyde cyclohexanediamine-Zn or bis-salicylaldehyde o-phenylenediamine-Zn. The method provided by the invention has the advantages that the catalyst is convenient to prepare, low in cost and less in use level; by using the product as the solvent, posttreatment is convenient; the method is low in reaction pressure, great in rate, safe to operate and suitable for scaled industrial production.

Description

technical field [0001] The invention relates to a preparation method of a cyclic carbonate, in particular to a method for preparing a cyclic carbonate by reacting carbon dioxide under normal pressure with an epoxide. Background technique [0002] Carbon dioxide is one of the important components of the atmosphere and an important part of the natural carbon cycle. However, with the extensive use of fossil fuels, the concentration of carbon dioxide rises rapidly and becomes a major greenhouse gas, causing a series of environmental and ecological problems. At the same time, carbon dioxide is an ideal carbon resource that is widely distributed, abundant in reserves, cheap and easy to obtain, renewable, non-toxic and non-flammable. No matter from the perspective of environmental protection or the utilization of renewable resources, the study of carbon dioxide fixation and chemical conversion is of great significance. The synthesis of organic carbonates from carbon dioxide is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/36C07D317/38B01J31/22
CPCB01J31/2282B01J2531/26C07D317/36C07D317/38
Inventor 郭春祥刘晓放何良年张洪学
Owner NANKAI UNIV
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