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A kind of preparation method for the solid catalyst of synthetic propylene carbonate

A solid catalyst, propylene carbonate technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problems of difficult catalyst recovery and high cost, and achieve solid Good loading effect, reduced preparation cost, and high catalytic activity

Inactive Publication Date: 2017-10-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is aimed at defects such as difficulty in catalyst recovery and high cost in the current synthesis of propylene carbonate

Method used

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  • A kind of preparation method for the solid catalyst of synthetic propylene carbonate
  • A kind of preparation method for the solid catalyst of synthetic propylene carbonate
  • A kind of preparation method for the solid catalyst of synthetic propylene carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add graphene oxide into toluene, wherein the mass ratio of toluene to graphene oxide is 100:1, stir magnetically for 30 minutes, heat up to 30°C, add 1,2-dibromoethane dropwise, wherein 1,2-dibromoethane The mass ratio of ethane to graphene oxide is 1:1, and the reaction is continued for 4h; triethylamine is then added dropwise to the above reaction system, and the molar ratio of triethylamine to 1,2-dibromoethane is 1:1, Continue to react for 2 hours after the drop; after the reaction, it is centrifuged, washed with toluene, and dried. The resulting catalyst was designated CAT-1.

Embodiment 2

[0020] Add graphene oxide into toluene, wherein the mass ratio of toluene to graphene oxide is 100:1, stir magnetically for 30 minutes, heat up to 60°C, add 1,2-dibromoethane dropwise, wherein 1,2-dibromo The mass ratio of ethane to graphene oxide is 1:1, and the reaction is continued for 4h; triethylamine is then added dropwise to the above reaction system, and the molar ratio of triethylamine to 1,2-dibromoethane is 1:1, Continue to react for 2 hours after the drop; after the reaction, it is centrifuged, washed with toluene, and dried. The resulting catalyst is designated CAT-2.

Embodiment 3

[0022] Add graphene oxide into toluene, wherein the mass ratio of toluene to graphene oxide is 100:1, stir magnetically for 30 minutes, heat up to 50°C, add 1,2-dibromoethane dropwise, wherein 1,2-dibromo The mass ratio of ethane to graphene oxide is 1:1, and the reaction is continued for 8h; triethylamine is then added dropwise to the above reaction system, and the molar ratio of triethylamine to 1,2-dibromoethane is 1:1, Continue to react for 6 hours after the drop; after the reaction, it is centrifuged, washed with toluene, and dried. The resulting catalyst was designated CAT-3.

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Abstract

The invention relates to a preparation method of a solid catalyst used in the process of synthesizing propylene carbonate. The method uses graphene oxide as a carrier, 1,2-dibromoethane and triethylamine as raw materials, and can be obtained by one-step reaction A solid catalyst for the synthesis of propylene carbonate by the cycloaddition reaction of carbon dioxide and propylene oxide. The method is simple to operate, and the obtained solid catalyst can be continuously recycled after simple treatment, has a long service life, is pollution-free, and greatly reduces production costs. When the catalyst is used in the synthesis of propylene carbonate, the catalytic activity is very high, the highest yield of cyclic carbonate can reach 84.2%, and the selectivity is 97.5%.

Description

technical field [0001] The invention relates to the field of preparation of solid catalysts, in particular to a solid catalyst for synthesizing propylene carbonate through cycloaddition reaction of carbon dioxide and propylene oxide and a preparation method thereof. Background technique [0002] Propylene carbonate (PC) is an important organic chemical widely used in organic synthesis, gas separation, electrochemistry, polymer synthesis, printing and dyeing, plastics and other fields. The traditional synthesis methods of propylene carbonate mainly include phosgene method, transesterification method, urea alcoholysis method, propylene oxide and carbon dioxide cycloaddition method. The phosgene method is banned because the phosgene in the raw material is highly toxic, causing serious harm to people and the environment; the transesterification method is generally not used in industrial production because the catalyst used is poisonous and the raw material is expensive; the urea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02C07D317/36
CPCY02P20/584
Inventor 薛冰柳娜李永昕许杰
Owner CHANGZHOU UNIV
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