Method for co-catalyzing ring-opening polymerization of carbon dioxide and alkylene oxide by organic base and hemicellulose

A technology of co-catalyzing carbon dioxide and hemicellulose, applied in the direction of organic chemistry, etc., can solve the problem of immature use methods, and achieve the effect of easy disposal and wide applicability

Inactive Publication Date: 2017-05-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the development and utilization of hemicellulose resources have been paid enough attention by researchers, their use is still not mature enough, resulting in the failure of this excellent renewable resource to fully exploit its value.

Method used

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  • Method for co-catalyzing ring-opening polymerization of carbon dioxide and alkylene oxide by organic base and hemicellulose
  • Method for co-catalyzing ring-opening polymerization of carbon dioxide and alkylene oxide by organic base and hemicellulose
  • Method for co-catalyzing ring-opening polymerization of carbon dioxide and alkylene oxide by organic base and hemicellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of the blend: Add 0.075g of hemicellulose, 2mL of dichloromethane, 5mL of propylene oxide, and organic base 1,8-diazabicycloundecone into a 25mL polytetrafluoroethylene substrate Carb-7-ene (DBU) 0.368mL (DBU:hemicellulose=5:1(w:w)), stir well.

[0026] (2) Catalytic reaction: fix the polytetrafluoroethylene substrate with the blend in the reactor, feed carbon dioxide gas to discharge the air in the reactor, continue to feed carbon dioxide to make the pressure inside the reactor reach 3MPa; adjust the temperature To 120°C, react for 4h.

[0027] (3) Post-treatment of the reaction: cool the reacted reactor to room temperature, add a certain amount of ethyl acetate to extract the product after the reaction, and rotary steam; utilize the developing agent prepared by petroleum ether and ethyl acetate (1:1~ 5:1) to separate by column chromatography to obtain propylene carbonate.

[0028] By adjusting the above-mentioned catalyst composition DBU: the mass ra...

Embodiment 2

[0030] (1) Preparation of the blend: Add 0.075g of hemicellulose, 2mL of dichloromethane, 5mL of epibromohydrin, and organic base 1,8-diazabicyclodeca into a 25mL polytetrafluoroethylene substrate Des-7-ene (DBU) 0.368mL; Stir well.

[0031] (2) Catalytic reaction: fix the polytetrafluoroethylene substrate with the blend in the reactor, feed carbon dioxide gas to discharge the air in the reactor, continue to feed carbon dioxide to make the pressure inside the reactor reach 3MPa; adjust the temperature To 120°C, react for 4h.

[0032] (3) post-processing of the reaction: the reaction kettle after the reaction is cooled to room temperature, a certain amount of ethyl acetate is added to extract the product after the reaction, rotary evaporation, and column chromatography separation to obtain the product

Embodiment 3

[0034] (1) Preparation of the blend: Add 0.075g of hemicellulose, 2mL of dichloromethane, 5mL of methyl propylene oxide, and organic base 1,8-diazabicyclo to a 25mL polytetrafluoroethylene substrate Undec-7-ene (DBU) 0.368mL; Stir well.

[0035] (2) Catalytic reaction: fix the polytetrafluoroethylene substrate with the blend in the reactor, feed carbon dioxide gas to discharge the air in the reactor, continue to feed carbon dioxide to make the pressure inside the reactor reach 3MPa; adjust the temperature To 120°C, react for 4h.

[0036] (3) post-processing of the reaction: the reaction kettle after the reaction is cooled to room temperature, a certain amount of ethyl acetate is added to extract the product after the reaction, rotary evaporation, and column chromatography separation to obtain the product

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Abstract

The invention belongs to the technical field of catalytic materials and discloses a method for co-catalyzing ring-opening polymerization of carbon dioxide and alkylene oxide by organic base and hemicellulose. The method comprises the following steps: the hemicellulose, the organic base, alkylene oxide and an organic solvent are stirred and mixed uniformly, the mixture is placed in a closed reactor, then carbon dioxide is introduced into the reactor, pressure in the reactor reaches 1-5 MPa, the temperature is increased to 100-180 DEG C, the mixture reacts for 1-5 h, and a product is obtained. According to the method, a heterogeneous catalysis system constituted by the hemicellulose and the organic base is used for catalytically converting carbon dioxide, and one novel method is provided for follow-up development of green catalysts on the basis of reasonable use of biomass resources.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a method for co-catalyzing the ring-opening polymerization reaction of carbon dioxide and alkylene oxide with an organic base and hemicellulose. Background technique [0002] With the use of fossil energy such as oil, coal, and natural gas, the environmental problems caused by the massive emissions of greenhouse gases such as carbon dioxide have become increasingly prominent. It is impractical to alleviate the content of carbon dioxide in the atmosphere by reducing the consumption of fossil fuels in a short period of time. Therefore, carbon capture and storage (CCS, carbon capture and storage) is one of the effective measures to reduce carbon dioxide emissions. In addition, carbon dioxide is also an abundant, non-toxic, cheap and non-combustible carbon resource. By developing green, efficient and cheap methods to convert carbon dioxide into high value-add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/36C07D317/46
CPCC07D317/36C07D317/46
Inventor 彭新文周秋生钟林新杜帆周静卓浩
Owner SOUTH CHINA UNIV OF TECH
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