Organic base catalyst and method for catalyzing alcoholysis of polycaprolactone by using organic base catalyst

A polycaprolactone and organic base technology, applied in organic compound/hydride/coordination complex catalysts, organic chemistry, chemical instruments and methods, etc., can solve the problem of high temperature, metal residue, long reaction time, etc. problem, achieve the effect of reducing energy loss, saving cost and shortening production cycle

Active Publication Date: 2022-07-29
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems that the existing catalysts catalyze the depolymerization of polyε-caprolactone with long reaction time, high temperature and metal residue caused by the use of metal catalysts, and provides an organic base catalyst and its catalyzed alcoholysis of polycaprolactone Methods

Method used

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  • Organic base catalyst and method for catalyzing alcoholysis of polycaprolactone by using organic base catalyst
  • Organic base catalyst and method for catalyzing alcoholysis of polycaprolactone by using organic base catalyst
  • Organic base catalyst and method for catalyzing alcoholysis of polycaprolactone by using organic base catalyst

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Experimental program
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Effect test

Embodiment 1

[0028] The reaction process of the present embodiment is as follows:

[0029]

[0030] The specific operation process of this embodiment is as follows:

[0031] Take a 25mL Schlenk bottle, bake it and replace the argon gas, add 1.14g polyε-caprolactone (M n =10.7kg / mol, ), then added 13.9 mg of TBD catalyst, 10 mL of toluene solvent, 5 mL of methanol was added outside the glove box, and the reaction was stirred at 80 °C. After the reaction for 2 h, the reaction system was detected by nuclear magnetic resonance. The conversion rate of the polymer was 92%. - Methyl hydroxycaproate.

[0032] Among them, TBD is

Embodiment 2

[0034] The reaction process of the present embodiment is as follows:

[0035]

[0036] The specific operation process of this embodiment is as follows:

[0037] Take a 25mL Schlenk bottle, bake it and replace the argon gas, add 1.14g polyε-caprolactone (M n =10.7kg / mol, ), then 13.9 mg of TBD catalyst was added, 5 mL of methanol was added outside the glove box, and the reaction was stirred at 80 °C. After the reaction for 0.5 h, the reaction system was detected by nuclear magnetic resonance. The conversion rate of the polymer was 93%, and the obtained product was 6-hydroxyhexane methyl acid. figure 1 To obtain methyl 6-hydroxyhexanoate 1 H NMR nuclear magnetic spectrum.

Embodiment 3

[0039] The reaction process of the present embodiment is as follows:

[0040]

[0041] The specific operation process of this embodiment is as follows:

[0042] Take a 25mL Schlenk bottle, bake it and replace the argon gas, add 1.14g polyε-caprolactone (M n =10.7kg / mol, ), then 11.75 mg of t-BuP was added 1 Catalyst, 10 mL of toluene solvent, 5 mL of methanol was added outside the glove box, and the reaction was stirred at 80 °C. After 5 hours of reaction, the reaction system was detected by nuclear magnetic resonance. The conversion rate of the polymer was 94%, and the obtained product was methyl 6-hydroxyhexanoate.

[0043] Among them, t-BuP 1 for where R is methyl.

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Abstract

The invention discloses an organic base catalyst and a method for catalyzing polycaprolactone alcoholysis by using the organic base catalyst, and belongs to the technical field of polycaprolactone depolymerization. The invention solves the problems of long reaction time and high required temperature of the existing catalyst for catalyzing the depolymerization of poly (epsilon-caprolactone) and metal residues caused by the use of a metal catalyst. According to the method, the organic base is adopted as a catalyst adopted by a polycaprolactone degradation system, efficient depolymerization of polycaprolactone can be achieved under the mild condition, the small-molecule product methyl 6-hydroxyhexanoate with the high additional value is obtained, and cyclic utilization of waste poly epsilon-caprolactone is achieved. The method is simple to operate, the process is green and environment-friendly, efficient depolymerization of polycaprolactone can be realized by adopting the organic base catalyst, meanwhile, depolymerization can be smoothly carried out under a solvent-free condition, the use of an organic solvent is avoided, and the recycling of a polycaprolactone material is really realized.

Description

technical field [0001] The invention relates to an organic base catalyst and a method for catalyzing polycaprolactone alcoholysis, belonging to the technical field of polycaprolactone depolymerization. Background technique [0002] As one of the most important materials in contemporary society, petroleum-based plastics are widely used in all aspects of life such as clothing, food, housing, and transportation. While bringing convenience to human daily life, it also brings serious environmental problems. According to relevant data, from 1950 to 2017, the global cumulative production of plastic was about 9.2 billion tons. It is expected that by 2050, the cumulative global plastic production will increase to 34 billion tons, while the annual plastic waste generation is about 300 million tons, but only 10% is recycled, about 12% is incinerated, and more than 70% is discarded into the soil, air and ocean. With the increasing depletion of petroleum resources and the proposal of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07C67/03C07C69/675
CPCB01J31/0235B01J31/0255B01J31/0271C07C67/03C07C69/675
Inventor 王庆刚徐广强董炳喆
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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