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Catalyst for preparing propylene carbonate and application thereof

A technology of propylene carbonate and catalyst, which is applied in the field of catalysts for preparing propylene carbonate, can solve the problems of high catalyst preparation cost, unfavorable industrial production application, etc., and achieve the effects of less catalyst consumption, easy separation and high purity

Inactive Publication Date: 2012-03-14
HENAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to literature reports, ruthenium porphyrin complexes (Acta Catalytica Sinica, 2007, 28, 287) and 2,2'-bipyridyl ruthenium complexes (J.Mol.Catal.A: Chem., 2007, 277, 35) are in In the presence of a cocatalyst, it has high catalytic activity for the cycloaddition reaction of carbon dioxide and epoxy compounds, and can catalyze the synthesis of propylene carbonate under milder reaction conditions, but the catalyst preparation cost is high, which is not conducive to industrial production and application

Method used

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  • Catalyst for preparing propylene carbonate and application thereof
  • Catalyst for preparing propylene carbonate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] will be 0.12×10 -3 Moles of main catalyst Ru(py) 4 Cl 2 and 0.12×10 -3 A mole of cocatalyst cetyltrimethylammonium bromide is put into a pre-dried 100mL stainless steel autoclave, vacuum-dried, and the air in the kettle is changed with a high-purity nitrogen device, and 16mL of purified propylene oxide (0.228 mol), heated up to 80°C, introduced carbon dioxide to 3MPa, reacted for 4 hours, and then cooled down to stop the reaction. The reaction solution was transferred to a vacuum distillation device, and the fraction at 76-78°C / 3mmHg was collected, which was propylene carbonate, weighing 23.0 grams, and the yield was 98.6%. The distillation residue is transferred to an autoclave to be used as a catalyst for the next catalytic reaction.

Embodiment 2

[0026] The residue of distilling propylene carbonate in Example 1 is transferred to the same autoclave as in Example 1, and is recycled as a catalyst, and 16 ml of purified propylene oxide is added again to react, and the reaction conditions are the same as in Example 1 , 22.9 grams of propylene carbonate were obtained, and the yield was 98.3%.

Embodiment 3

[0028] In the same equipment used in Example 1, under the same conditions, tetrabutylammonium bromide is used as the cocatalyst instead of hexadecyltrimethylammonium bromide, and the reaction is carried out, and the temperature is raised to 100 ° C, and carbon dioxide is introduced to 2.5 MPa, and reacted for 6 hours to obtain 22.4 grams of propylene carbonate with a yield of 96.1%.

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Abstract

The invention relates to a catalyst for preparing propylene carbonate through the reaction of carbon dioxide and propylene oxide and the application thereof. The catalyst comprises a main catalyst ruthenium pyridine compound and an auxiliary catalyst quaternary. The molar ratio of the main catalyst to the auxiliary catalyst is 1:1 to 2, and the molar ratio of the main catalyst to the is 1:800 to 10000. The catalyst is used to catalyze the reaction of the carbon dioxide and the propylene oxide, so as to synthesize the propylene carbonate with high yield and high selectivity. The catalyst can be reused.

Description

technical field [0001] The invention relates to a catalyst for preparing propylene carbonate and its application as a catalyst for preparing propylene carbonate by reacting carbon dioxide and propylene oxide. Background technique [0002] Carbon dioxide is a major greenhouse gas, and the preparation of cyclic carbonates through the reaction of carbon dioxide and epoxy compounds is a low-pollution, environmentally friendly and effective way to fix carbon dioxide. Propylene carbonate (PC) prepared from carbon dioxide is a high-boiling point, aprotic organic solvent and organic synthesis intermediate with excellent performance. Compounds, urea decarburization, gas separation, battery electrolyte and metal extraction have been widely used. [0003] The catalysts that have been reported to be used to catalyze the reaction of carbon dioxide and propylene oxide to prepare propylene carbonate are mainly quaternary ammonium salts, phosphine salts, alkali metal salts, Mg-Al composite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/36B01J31/22
CPCY02P20/584
Inventor 卜站伟杨立荣王志强任铁钢杜风光崔元臣
Owner HENAN UNIVERSITY