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Method for preparing cyclic carbonates from carrying hydroxyl ionic liquid

A cyclic carbonate and ionic liquid technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, organic chemistry, etc., can solve the problem of active components being sensitive to water, low reactivity, easy Churn and other issues

Active Publication Date: 2008-08-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many types of catalysts reported, there are still problems such as low reactivity, long reaction time, and active components are sensitive to water and easy to be lost. Therefore, it is very important to develop a catalytic system with high activity, mild reaction conditions and stability.

Method used

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  • Method for preparing cyclic carbonates from carrying hydroxyl ionic liquid
  • Method for preparing cyclic carbonates from carrying hydroxyl ionic liquid
  • Method for preparing cyclic carbonates from carrying hydroxyl ionic liquid

Examples

Experimental program
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Embodiment 1

[0019]

[0020] Implementation method: in a 100ml stainless steel autoclave, sequentially add 0.5 g of ethanol imidazolium bromide (n=2 in the structural formula) supported by polystyrene resin (D301) (3.0 mmol, 1.5 mol % based on the content of ionic liquid, the following Same), 14ml propylene oxide (1a) (0.2mol), sealed reactor, filled with carbon dioxide of appropriate pressure, controlled temperature by temperature controller to rise slowly to 110 ℃, then controlled reaction pressure to 2.5MPa, reacted for 4.0 hours. After the reaction, the reactor was cooled to 5° C., and excess carbon dioxide was slowly released. After the catalyst was separated by filtration, the obtained product (2a) was analyzed by gas chromatography, and the selectivity was >99.8%, and the yield was 96%.

Embodiment 2

[0022] Same as in Example 1, the catalyst used is 0.4 g (about 3.0 mmol) of ethanol imidazole chloride (n=2 in the structural formula, X=Cl) supported by polystyrene resin, and other conditions are constant, and the selectivity of product (2a) is 98.5 %, the yield is 75%.

Embodiment 3

[0024] Same as Example 1, the catalyst used is 0.5 g (3.2 mmol) of propanol imidazole chloride (n=3 in the structural formula, X=Cl) supported by polystyrene resin (D201), the reaction temperature is 120 ° C, and other conditions are constant , to obtain (2a) with a selectivity of 99% and a yield of 87%.

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Abstract

The invention relates to a method for preparing cyclic carbonic acid esters from load-type hydroxyl ion liquid, characterized in that hydroxyl imidazole ion liquid loaded by polystyrene resin is used as the catalyzer, the amount of the catalyzer is 0.4-5mol% (based on ion liquid content) of epoxides, related cyclic carbonic acid esters are synthesized by catalyzing addition of epoxides and carbon dioxide ring under reaction pressure of 0.1-10.0 MPa, reaction temperature of 40-160 DEG C, and reaction time is 0.3-8 hours. The synthesis method has advantages of high catalyzer activity, low cost, long life time, etc.

Description

Technical field: [0001] The invention relates to a method for preparing cyclic carbonate by cycloaddition of epoxy compound and carbon dioxide. 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, which is widely used in the synthesis of pharmaceutical and fine chemical intermediates. With the recent economic value and industrial demand for the preparation of dimethyl carbonate and the synthesis of ethylene glycol from ethylene carbonate as raw material, more and more attention has been paid to the research in this area. [0003] Most of the currently reported methods for producing cyclic carbonates use binary homogeneous catalysts consisting of Lewis acid metals and Lewis bases, wherein the Lewis metals used include: alkali...

Claims

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Application Information

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IPC IPC(8): C07D317/10B01J31/06
CPCY02P20/584
Inventor 张锁江孙剑成卫国任俊毅孟震英李谦
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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