Solubility determination and thermodynamic modeling of bis-2-hydroxyethyl terephthalate (BHET) in different solvents

doi:10.1016/j.cjche.2021.03.024

中国化学工程学报 ›› 2022, Vol. 45 ›› Issue (5): 294-300.DOI: 10.1016/j.cjche.2021.03.024

• • 上一篇

Solubility determination and thermodynamic modeling of bis-2-hydroxyethyl terephthalate (BHET) in different solvents

Haoyu Yao^1,2, Dongxia Yan^1,2, Xingmei Lu^1,2,3,4, Qing Zhou^1,2,4, Yinan Bao⁵, Junli Xu^1,2

1 Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Sino Danish College, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China;
5 College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

收稿日期:2021-01-18 修回日期:2021-03-09 出版日期:2022-05-28 发布日期:2022-06-22
通讯作者: Xingmei Lu,E-mail:xmlu@ipe.ac.cn;Qing Zhou,E-mail:qzhou@ipe.ac.cn
基金资助:
This work was financially supported by the National Key Research and Development Program of China (2019YFC1908204), the National Natural Scientific Fund of China (No. 21878292, 21776289, 21908232, and 21978291), Innovation Academy for Green Manufacture, Chinese Academy of Sciences (No. IAGM2020C12, IAGM2020C21 and IAGM-2019-A06), and K. C. Wong Education Foundation (No. GJTD-2018-04).

Solubility determination and thermodynamic modeling of bis-2-hydroxyethyl terephthalate (BHET) in different solvents

Haoyu Yao^1,2, Dongxia Yan^1,2, Xingmei Lu^1,2,3,4, Qing Zhou^1,2,4, Yinan Bao⁵, Junli Xu^1,2

1 Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Sino Danish College, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China;
5 College of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

Received:2021-01-18 Revised:2021-03-09 Online:2022-05-28 Published:2022-06-22
Contact: Xingmei Lu,E-mail:xmlu@ipe.ac.cn;Qing Zhou,E-mail:qzhou@ipe.ac.cn
Supported by:
This work was financially supported by the National Key Research and Development Program of China (2019YFC1908204), the National Natural Scientific Fund of China (No. 21878292, 21776289, 21908232, and 21978291), Innovation Academy for Green Manufacture, Chinese Academy of Sciences (No. IAGM2020C12, IAGM2020C21 and IAGM-2019-A06), and K. C. Wong Education Foundation (No. GJTD-2018-04).

摘要/Abstract

摘要： Studies on the degradation process of waste polyethylene terephthalate (PET) have become increasingly mature, but there are relatively few studies on the separation of degradation products. The products contain many components and the separation of which is difficult. Therefore, the study on phase equilibrium thermodynamics of bis-2-hydroxyethyl terephthalate (BHET) is of great theoretical significance and practical value to provide basic data for the BHET crystallization separation. In this work, the degraded products were purified and characterized. The solubility of BHET in methanol, ethanol, ethylene glycol, water and the mixture of ethylene glycol + water were determined by static method. The experimental results were correlated with different models, such as ideal solution (IS) model, λh equation, Apelblat equation and NRTL model. Based on the van't Hoff equation, the mixing Gibbs energy, enthalpy and entropy were calculated. From this work, the basic data which can be used to guide the crystallization process of BHET were obtained, including solubility data, correlation model and thermodynamic properties.

关键词: Bis-2-hydroxyethyl terephthalate, Purified, Characterized, Solubility, Correlation model, Thermodynamics properties

Abstract: Studies on the degradation process of waste polyethylene terephthalate (PET) have become increasingly mature, but there are relatively few studies on the separation of degradation products. The products contain many components and the separation of which is difficult. Therefore, the study on phase equilibrium thermodynamics of bis-2-hydroxyethyl terephthalate (BHET) is of great theoretical significance and practical value to provide basic data for the BHET crystallization separation. In this work, the degraded products were purified and characterized. The solubility of BHET in methanol, ethanol, ethylene glycol, water and the mixture of ethylene glycol + water were determined by static method. The experimental results were correlated with different models, such as ideal solution (IS) model, λh equation, Apelblat equation and NRTL model. Based on the van't Hoff equation, the mixing Gibbs energy, enthalpy and entropy were calculated. From this work, the basic data which can be used to guide the crystallization process of BHET were obtained, including solubility data, correlation model and thermodynamic properties.

Key words: Bis-2-hydroxyethyl terephthalate, Purified, Characterized, Solubility, Correlation model, Thermodynamics properties

Haoyu Yao, Dongxia Yan, Xingmei Lu, Qing Zhou, Yinan Bao, Junli Xu. Solubility determination and thermodynamic modeling of bis-2-hydroxyethyl terephthalate (BHET) in different solvents[J]. 中国化学工程学报, 2022, 45(5): 294-300.

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Solubility determination and thermodynamic modeling of bis-2-hydroxyethyl terephthalate (BHET) in different solvents

Solubility determination and thermodynamic modeling of bis-2-hydroxyethyl terephthalate (BHET) in different solvents

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