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Depolymerization method of caprolactone oligomer

A technology of caprolactone oligomers and caprolactone, which is applied in the field of organic waste, especially the treatment of caprolactone oligomers, to achieve obvious environmental benefits, good depolymerization effect, and easy acquisition

Active Publication Date: 2015-01-21
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of depolymerization method of caprolactone oligomer, solves the problem that produces caprolactone oligomer in caprolactone production process and caprolactone polymerization process, uses this method to reduce caprolactone Depolymerize polymers into caprolactone, turn waste into treasure, improve economic benefits, and solve environmental problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put 100g of caprolactone oligomer in a 500ml glass three-necked bottle, then add 1g of calcium oxide into it, seal the three-necked bottle, put it on the heating mantle, and connect the gas phase condenser on the three-necked bottle, then turn on the machine Stirring device, evacuated to 5kPa (absolute pressure), then heated the three-neck flask to 200°C for depolymerization, collected depolymerization condensate after depolymerization, obtained 80g of crude caprolactone, and 8.5g of residue at the bottom of the bottle. Through analysis by gas chromatography, the weight percentage of caprolactone in the condensate was 90.4%. The depolymerization rate of caprolactone oligomers was 91.5%, and the yield of caprolactone was 72.3%.

Embodiment 2

[0022] Put 100g of caprolactone oligomer in a 500ml glass three-necked bottle, then add 3g of magnesium oxide to it, seal the three-necked bottle, put it on the heating mantle, and connect the gas phase condenser on the three-necked bottle, then turn on the machine Stirring device, evacuated to 10kPa (absolute pressure), then heated the three-neck flask, raised the temperature to 200°C, and depolymerized. After the depolymerization was completed, the depolymerization condensate was collected to obtain 76g of crude caprolactone, and the residue at the bottom of the bottle was 9.6g. Through gas chromatography analysis, the weight percentage of caprolactone in the condensate was 88.4%, the depolymerization rate of caprolactone oligomers was 90.4%, and the caprolactone acquisition rate was 67.2%.

Embodiment 3

[0024] Put 100g of caprolactone oligomer in a 500ml glass three-necked bottle, then add 4g of alumina to it, seal the three-necked bottle, put it on the heating mantle, and connect the gas phase condenser to the three-necked bottle, then turn on the mechanical stirring device, evacuated to 15kPa (absolute pressure), then heated the three-necked bottle, and raised the temperature to 200°C for depolymerization. After the depolymerization was completed, the depolymerization condensate was collected to obtain 78.2g of crude caprolactone, and 9.2g remained at the bottom of the bottle. Through gas chromatography analysis, the weight percentage of caprolactone in the condensate was 89.3%, the depolymerization rate of caprolactone oligomers was 90.8%, and the caprolactone acquisition rate was 69.8%.

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Abstract

The invention discloses a depolymerization method of a caprolactone oligomer. In the method, at a temperature of 100-500 DEG C and under an absolute pressure of 0.5-80 kPa, the caprolactone oligomer is depolymerized into caprolactone and other organic by-products by a depolymerization agent. By means of the method, a depolymerization ratio of the caprolactone oligomer is higher than 84.9% and a yield of the caprolactone is higher than 65%. The method has a significant economic benefit. In addition, by means of the depolymerization agent, the caprolactone oligomer is depolymerized into the caprolactone, thereby turning waste into resources. The method has a significant environmental-protective benefit.

Description

technical field [0001] The invention relates to the technical field of processing organic wastes, especially caprolactone oligomers, in particular to a depolymerization method for caprolactone oligomers. Background technique [0002] ε-caprolactone (ε-CL) is an important organic synthesis intermediate, mainly used for the synthesis of polycaprolactone and for the copolymerization or blending modification of other esters, because of its good biocompatibility Non-toxic, biodegradable and good drug penetration, it has been widely used in degradable plastics and biomedicine. In addition, since caprolactone is a temperature-sensitive substance, it is easy to self-polymerize into 2-10 molecular oligomers at high temperature, and in the production process of ε-caprolactone, the temperature of the rectification process is relatively high, and ε-caprolactone Lactone self-polymerizes to a certain extent to produce caprolactone oligomers, resulting in increased waste and increased pro...

Claims

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Application Information

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IPC IPC(8): C07D313/04
CPCC07D313/04
Inventor 刘洪武黎树根高伟李勇军
Owner CHINA PETROLEUM & CHEM CORP