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Efficient Purification of the Glycolysis Monomer of Polyester Enabled by Its Unique Phase Transition Property
增强出版- ACTA POLYMERICA SINICA Vol. 54, Issue 3, Pages: 346-355(2023)
- 作者机构：
1.纤维材料改性国家重点实验室 东华大学材料科学与工程学院 上海 201620
2.浙江佳人新材料有限公司 绍兴 312000
- 作者简介：
Long Chen, E-mail: happyjack@dhu.edu.cn
Wei-wei Zuo, E-mail: zuoweiwei@dhu.edu.cn
- 基金信息：
DOI：10.11777/j.issn1000-3304.2022.22286
CLC：Published：20 March 2023，
Published Online：16 November 2022，
Received：22 August 2022，
Accepted：17 October 2022
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鲍青青,孙海钰,陈卓等.涤纶化学降解单体产物的高效结晶提纯研究[J].高分子学报,2023,54(03):346-355.
Bao Qing-qing,Sun Hai-yu,Chen Zhuo,et al.Efficient Purification of the Glycolysis Monomer of Polyester Enabled by Its Unique Phase Transition Property[J].ACTA POLYMERICA SINICA,2023,54(03):346-355.
鲍青青,孙海钰,陈卓等.涤纶化学降解单体产物的高效结晶提纯研究[J].高分子学报,2023,54(03):346-355. DOI： 10.11777/j.issn1000-3304.2022.22286.
Bao Qing-qing,Sun Hai-yu,Chen Zhuo,et al.Efficient Purification of the Glycolysis Monomer of Polyester Enabled by Its Unique Phase Transition Property[J].ACTA POLYMERICA SINICA,2023,54(03):346-355. DOI： 10.11777/j.issn1000-3304.2022.22286.
摘要
为了解决废旧涤纶(PET)纺织品乙二醇醇解法循环利用中存在的醇解产物对苯二甲酸二乙二醇酯(BHET)纯化困难的问题，通过研究BHET晶体的独特的相变性质，发展了BHET纯化新技术. 实验结果表明，对结晶的、醇解反应产物BHET使用减压升华操作，在1.33 kPa，130 ℃的条件下，可获得纯度达99.7%，收率达86.4%，白度(
L
*
值)达99.8的纯化BHET. 回收所得的BHET可再缩聚制备再生PET. 该再生PET在相同条件下与由石油基BHET缩聚所制得的PET具有类似的性质，包括白度、分子量及分子量分布等. 本文还验证了该种醇解法回收废旧涤纶纺织品的技术的普适性：考察各种含有不同成分及颜色的涤纶纺织品样品的醇解行为及产物分离纯化效果. 所研究的BHET纯化方法步骤短、产物纯度高、不额外使用有毒化学试剂，并有效地克服了粉末状BHET在加热纯化时容易发生缩聚的关键难题，为高品质回收废旧涤纶纺织品提供了一种新的路径.
Abstract
To overcome the difficulties of purification and decolorization of bis(2-hydroxyethyl) terephthalate (BHET) that is associated with the recycling of wasted polyester (PET) textiles
this work studies the unique phase transition behavior of crystalline BHET in hope to find new and efficient purification strategies of the glycolysis product monomer of PET. With sublimation in vacuum
pure and decolorized BHET can be obtained with yield of up to 86.4%
purity of up to 99.7% and whiteness (
L
*
value) of up to 99.8
respectively. Re-polymerization of the obtained purified BHET afforded recycled PET
which possessed similar properties with respective to the PET derived from petroleum-based BHET
including molecular weight
the distribution of molecular weight and whiteness
respectively. The effectiveness of this recycling strategy of wasted polyester textile was also verified by evaluating a series of PET samples
including PET textile blends and the real wasted polyester textiles that were picked from waste bins. This purification strategy of BHET requires less purification steps
affords high purity of the product
obviates the uses of toxic chemicals
avoids the high propensity of BHET powders to polycondensation under the commonly purification conditions and will provide a new strategy for high-quality recycling of waste polyester textiles.
关键词
废旧涤纶纺织品回收对苯二甲酸二乙二醇酯纯化废旧涤纶脱色乙二醇醇解法
Keywords
Recycling of waste polyester textilesPurification of bis(2-hydroxyethyl) terephthalateDecolorization of waste polyesterGlycolysis
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