Ethylene glycol purification by melt crystallization: Removal of 2-methoxyethanol impurity

doi:10.1016/j.cjche.2020.12.003

中国化学工程学报 ›› 2021, Vol. 37 ›› Issue (9): 39-45.DOI: 10.1016/j.cjche.2020.12.003

• Separation Science and Engineering • 上一篇下一篇

Ethylene glycol purification by melt crystallization: Removal of 2-methoxyethanol impurity

Tiefeng Wang¹, Jinxiang Dong^1,2

1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China

收稿日期:2020-08-08 修回日期:2020-11-24 出版日期:2021-09-28 发布日期:2021-11-02
通讯作者: Jinxiang Dong
基金资助:
This work was financially supported by the Program for Sanjin Scholars of Shanxi Province of China, and Ten Thousand Talents Program:Millions of Leading Engineering Talents.

Ethylene glycol purification by melt crystallization: Removal of 2-methoxyethanol impurity

Tiefeng Wang¹, Jinxiang Dong^1,2

1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China

Received:2020-08-08 Revised:2020-11-24 Online:2021-09-28 Published:2021-11-02
Contact: Jinxiang Dong
Supported by:
This work was financially supported by the Program for Sanjin Scholars of Shanxi Province of China, and Ten Thousand Talents Program:Millions of Leading Engineering Talents.

摘要/Abstract

摘要： The coal (syngas)-to-ethylene glycol (CTEG), is contaminated with the naughty impurity 2-Methoxyethanol (ME) generated during the hydrogenation stage, which affect the quality of EG for fiber-grade polyester production. Distillation, is the employed separation process in industrial, which makes production complicated because of the heat sensitivity of the impurities system. Melt crystallization has been regarded as an effective technology to obtain high-purity organic compounds based on the melting points difference, which could avoid the problems by heating. In this work, we have explored the feasibility of the static melt crystallization on the separation of EG/ME in a jacketed crystallization tube. The experimental parameters were investigated, which covers crystallization and sweating stage in each step. The results showed that the purity of EG could reach ≥ 99.8% from the binary system studied via the quaternary separation process.

关键词: Separation, Crystallization, Purification, Ethylene glycol, 2-Methoxyethanol

Abstract: The coal (syngas)-to-ethylene glycol (CTEG), is contaminated with the naughty impurity 2-Methoxyethanol (ME) generated during the hydrogenation stage, which affect the quality of EG for fiber-grade polyester production. Distillation, is the employed separation process in industrial, which makes production complicated because of the heat sensitivity of the impurities system. Melt crystallization has been regarded as an effective technology to obtain high-purity organic compounds based on the melting points difference, which could avoid the problems by heating. In this work, we have explored the feasibility of the static melt crystallization on the separation of EG/ME in a jacketed crystallization tube. The experimental parameters were investigated, which covers crystallization and sweating stage in each step. The results showed that the purity of EG could reach ≥ 99.8% from the binary system studied via the quaternary separation process.

Key words: Separation, Crystallization, Purification, Ethylene glycol, 2-Methoxyethanol

Tiefeng Wang, Jinxiang Dong. Ethylene glycol purification by melt crystallization: Removal of 2-methoxyethanol impurity[J]. 中国化学工程学报, 2021, 37(9): 39-45.

Tiefeng Wang, Jinxiang Dong. Ethylene glycol purification by melt crystallization: Removal of 2-methoxyethanol impurity[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 39-45.

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Ethylene glycol purification by melt crystallization: Removal of 2-methoxyethanol impurity

Ethylene glycol purification by melt crystallization: Removal of 2-methoxyethanol impurity

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