Method for degrading aliphatic polyester and recovering low polyester or monomer

A technology for degrading fat and low-polyester, which is applied in fermentation and other directions, can solve the problems that biodegradable materials cannot be recycled and reused, and achieve the effects of low recycling cost, simple operation and energy saving

Active Publication Date: 2011-11-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiency that the above-mentioned biodegradable materials cannot be recycled and reused, the present invention provides a method of using immobilized lipase to degrade aliphatic polyesters to recover oligoesters or monomers, which has the advantages of simple operation, energy saving, and resource recycling. Utilization, enzymes can be recycled repeatedly and low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for degrading aliphatic polyesters to reclaim low polyesters or monomers, comprising the following steps:

[0015] First, 0.5 g of polybutylene succinate (PBS), 0.03 g of immobilized lipase, 30 ml of tetrahydrofuran, and 2 ml of distilled water were placed in a three-necked flask at a reaction temperature of 50° C. for 12 hours.

[0016] Next, add 15ml of toluene, 0.03g of immobilized lipase, stir at a low speed of 60r / min, react at a reaction temperature of 50°C under normal pressure for 20h, and recover the lipase to obtain the degradation product.

[0017] Through GPC analysis, the PBS with a number average molecular weight Mn of 100,000 is degraded into oligomers with an Mn of 300.

Embodiment 2

[0019] A method for degrading aliphatic polyesters to reclaim low polyesters or monomers, comprising the following steps:

[0020] First, 0.6g of polybutylene succinate-co-diglycolate (PBS-co-DGA) copolymer, 0.03g of immobilized lipase, 30ml of tetrahydrofuran, and 4ml of distilled water were placed in a three-necked flask, and the reaction temperature 50°C, the reaction time is 8h.

[0021] Next, add 15ml of toluene, 0.03g of immobilized lipase, stir at a low speed of 90r / min, react at a temperature of 55°C under normal pressure for 15h, and recover the lipase to obtain the degradation product.

[0022] Through GPC test analysis, the PBS-co-DGA copolymer with a number average molecular weight Mn of 50000 is degraded into an oligomer with a number average molecular weight Mn of 600.

Embodiment 3

[0024] A method for degrading aliphatic polyesters to reclaim low polyesters or monomers, comprising the following steps:

[0025] First, 0.5 g of polybutylene succinate-co-1,4 cyclohexanediol ester (PBS-co-1,4-CHDM) copolymer, 0.04 g of immobilized lipase, 30 ml of toluene, and 5 ml of distilled water were placed In a three-neck flask, keep the temperature at 80°C, stir at a constant speed, and the reaction time is 10 hours.

[0026] Next, add 15ml of toluene, 0.04g of immobilized lipase, stir at a low speed of 120r / min, react at 80°C under normal pressure for 20h, and recover the lipase to obtain the degradation product.

[0027] Through GPC analysis, the PBS-co-1,4-CHDM copolymer with a number average molecular weight Mn of 100,000 degrades into an oligomer with a number average molecular weight Mn of 410.

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Abstract

The invention discloses a method for recovering an oligoester or a monomer by degrading aliphatic polyester by immobilized lipase, which comprises the following steps: firstly, 0.1 to 5g of aliphatic polyester and 0.01 to 0.5g of immobilized lipase are placed into a three-mouth flask, 10 to 80ml of tetrahydrofuran or methylbenzene and 1 to 5ml of distilled water are added into the mixture, the reaction temperature is between 30 and 80 DEG C, and the reaction time is between 4 and 16h; and secondly, the methylbenzene and the immobilized lipase are added into reactants, the volume ratio of the methylbenzene to the tetrahydrofuran to the distilled water is 10-30: 10-80: 1-5ml, 0.01 to 0.5g of immobilized lipase is added into the mixture, the stirring is performed at a low speed of between 60and 120r / min, a reaction is performed for 20 to 30h under normal pressure at a temperature of between 30 and 80 DEG C, and lipase is recovered after the reaction is finished to obtain a degradation product. The method has the advantages of simple operation, energy conservation, recycled resource, and low recovery cost.

Description

technical field [0001] The invention belongs to the technical field of degrading aliphatic polyesters by biodegradation methods, in particular to a method for degrading aliphatic polyesters with immobilized lipase and recovering oligoesters or monomers. Background technique [0002] At present, due to the shortage of oil resources, countries around the world have taken energy conservation, emission reduction and resource recycling as an important indicator in the green chemical industry, especially in the field of petrochemicals, due to the high feasibility of plastic recycling, and this can To save a lot of organic carbon and energy resources, green chemical recycling polymer materials are being actively developed and applied. However, due to the defect of poor high temperature resistance of biodegradable plastics, its large-scale application in industry is limited. From the standpoint of saving limited carbon resources and energy consumption, using biocatalysts to catalyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/62
Inventor 张敏丁明亮
Owner SHAANXI UNIV OF SCI & TECH
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