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Catalyst for preparing propylene carbonate and application thereof

A technology of propylene carbonate and catalyst, applied in the field of catalyst for preparing propylene carbonate, can solve the problems of high catalyst preparation cost, unfavorable industrial production application and the like, and achieve the effects of less catalyst dosage, easy separation and high purity

Inactive Publication Date: 2010-07-21
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] 0.12×10 -3 Moles of main catalyst Ru(py) 4 Cl 2 And 0.12×10 -3 Moles of co-catalyst cetyltrimethylammonium bromide was put into a pre-dried 100mL stainless steel autoclave, vacuum dried, the air in the kettle was replaced with a high-purity nitrogen device, and 16mL of purified propylene oxide (0.228 Mol), heating to 80°C, introducing carbon dioxide to 3MPa, reacting for 4 hours, and cooling to stop the reaction. The reaction liquid was transferred to a vacuum distillation device, and vacuum distillation was performed to collect the 76-78°C / 3mmHg fraction, which is propylene carbonate, weighing 23.0 grams, and the yield was 98.6%. The distillation residue is transferred to the autoclave to be used as a catalyst for the next catalytic reaction.

Embodiment 2

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

Embodiment 3

[0028] Using the same equipment as in Example 1, under the same conditions, the co-catalyst replaced cetyltrimethylammonium bromide with tetrabutylammonium bromide, and the reaction was carried out. The temperature was raised to 100°C and carbon dioxide was introduced. To 2.5MPa, react 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 the main greenhouse gas. The preparation of cyclic carbonates by 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 an excellent high-boiling point, aprotic organic solvent and organic synthesis intermediate. It is used in fine chemical synthesis, transesterification to produce dimethyl carbonate, and ring-opening polymerization to prepare polymers Compounds, urea decarburization, gas separation, battery electrolyte and metal extraction are widely used in fields. [0003] The catalysts that have been reported to catalyze the reaction of carbon dioxide and propylene oxide to prepare propy...

Claims

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Application Information

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