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Dual-function catalyst for preparing cyclic carbonates through cycloaddition of CO2 and epoxy compound and preparation method thereof

A bifunctional catalyst and epoxy compound technology, which is applied in the field of environmental science and fine organic chemical industry, can solve problems such as the greenhouse effect, and achieve the effects of simple preparation, high catalytic activity, and mild reaction conditions

Active Publication Date: 2016-06-15
湖州优研知识产权服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] carbon dioxide (CO 2 ) is a non-toxic, cheap gas, and is a renewable C1 resource with abundant reserves, but a large amount of CO 2 emissions lead to the greenhouse effect
[0004] In order to solve the above problems, the present invention uses tetrabromotoluene and Salen-Co compound as precursors to prepare bifunctional catalysts to catalyze the synthesis of cyclic carbonates. This method has not been reported yet.

Method used

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  • Dual-function catalyst for preparing cyclic carbonates through cycloaddition of CO2 and epoxy compound and preparation method thereof
  • Dual-function catalyst for preparing cyclic carbonates through cycloaddition of CO2 and epoxy compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Diethylamine and 4-diethylamino salicylaldehyde were added to 30mL ethanol solvent according to the molar ratio of 1:2, and after reflux and stirring for 24h, the mixture was lowered to room temperature and allowed to stand for 48h, the yellow crystals were filtered out, and washed with ethanol Washing three times, drying in vacuo at 50°C for 24 hours to obtain the Salen ligand, then adding the Salen ligand and cobalt acetate tetrahydrate to 30 mL of a mixed solvent of toluene and methanol in a molar ratio of 1:1 (volume ratio of 1:1), After the above mixed solution was stirred at 60°C for 24h, tetrabromotoluene was added thereto (1 / 2 of the molar weight of the Salen ligand), and the stirring was continued for 24h, the solid product was filtered out, washed twice with ethyl acetate, and then heated at 60°C Dry under vacuum for 24 hours to obtain the bifunctional catalyst TBB-Salen-Co. For its synthetic route, see figure 1 , Infrared characterization spectrum see figu...

Embodiment 2

[0017] Propylene oxide and catalyst TBB-Salen-Co were added into the miniature autoclave according to the mass ratio of 20:1, CO 2 The pressure was 1 MPa, and the reaction was stirred at 70° C. for 6 h to obtain a mixture containing cyclic carbonate products. According to gas chromatographic analysis, the conversion rate of propylene oxide is 95%, and the selectivity of cyclocarbonate product is 100%.

Embodiment 3

[0019] Add epichlorohydrin and catalyst TBB-Salen-Co into the miniature autoclave according to the mass ratio of 20:1, CO 2 The pressure was 1 MPa, and the reaction was stirred at 80° C. for 8 h to obtain a mixture containing cyclic carbonate products. According to gas chromatographic analysis, the conversion rate of epichlorohydrin is 90%, and the selectivity of cyclocarbonate product is 95%.

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Abstract

The invention discloses a dual-function catalyst for preparing cyclic carbonates through cycloaddition of CO2 and an epoxy compound and a preparation method thereof. Tetrakisbenzene and Salen-Co complexes are adopted as a precursor to be subjected to a reaction to obtain the dual-function catalyst containing bromine negative ions and metal cobalt atoms. The dual-function catalyst has the advantages that the preparation method of the catalyst is simple and easy to implement, the production cost is low, the catalytic activity and selectivity are high, no solvent or auxiliaries need to be added into a reaction system, reaction conditions are mild, and the preparation method is expected to become a clean CO2 cycloaddition technological path with the huge competitiveness.

Description

technical field [0001] The present invention relates to CO 2 The invention discloses a bifunctional catalyst for preparing cyclocarbonate by cycloaddition with epoxy compounds and a preparation method thereof, belonging to the technical fields of environmental science and fine organic chemical industry. Background technique [0002] carbon dioxide (CO 2 ) is a non-toxic, cheap gas, and is a renewable C1 resource with abundant reserves, but a large amount of CO 2 emissions lead to the greenhouse effect. will CO 2 Converted into a variety of chemical products through organic synthesis, which can not only realize CO 2 The effective use of resources can reduce the impact of the greenhouse effect. Among them, CO 2 It is an important class of biomedical precursors, aprotic polar solvents, and raw materials for engineering plastics to generate corresponding cyclocarbonates through cycloaddition reactions with epoxy compounds. Therefore, this reaction becomes CO 2 Hotspots in...

Claims

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Application Information

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IPC IPC(8): B01J31/22C07D317/36C07D317/50
CPCB01J31/2217B01J2231/324B01J2531/0213B01J2531/845C07D317/36C07D317/50
Inventor 冷炎卢丹蒋平平
Owner 湖州优研知识产权服务有限公司
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