Esterification Behavior of Coal-based Ethylene Glycol and Its Application in Polyester Fibers Manufacture

Shuai Cai; Hai-yu Sun; Zhuo Chen; Wei-wei Zuo

doi:10.11777/j.issn1000-3304.2026.26037

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Esterification Behavior of Coal-based Ethylene Glycol and Its Application in Polyester Fibers Manufacture

Research Article | 更新时间：2026-07-08

- Esterification Behavior of Coal-based Ethylene Glycol and Its Application in Polyester Fibers Manufacture
- Acta Polymerica Sinica Vol. 57, Issue 7, Pages: 1480-1488(2026)
- 作者机构：
  
  东华大学材料科学与工程学院先进纤维材料全国重点实验室上海 201620
- 作者简介：
  
  Wei-wei Zuo, E-mail: zuoweiwei@dhu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2026.26037
  CLC：
- CSTR：32057.14.GFZXB.2026.7601
- Received：04 February 2026，
  
  Accepted：03 April 2026，
  
  Online First：17 June 2026，
  
  Published：20 July 2026
- 稿件说明：
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蔡帅, 孙海钰, 陈卓, 左伟伟. 煤制乙二醇的酯化反应行为及聚酯纤维的制备. 高分子学报, 2026, 57(7), 1480-1488.

Cai, S.; Sun, H. Y.; Chen, Z.; Zuo, W. W. Esterification behavior of coal-based ethylene glycol and its application in polyester fibers manufacture. Acta Polymerica Sinica (in Chinese), 2026, 57(7), 1480-1488.
蔡帅, 孙海钰, 陈卓, 左伟伟. 煤制乙二醇的酯化反应行为及聚酯纤维的制备. 高分子学报, 2026, 57(7), 1480-1488. DOI： 10.11777/j.issn1000-3304.2026.26037. CSTR： 32057.14.GFZXB.2026.7601.

Cai, S.; Sun, H. Y.; Chen, Z.; Zuo, W. W. Esterification behavior of coal-based ethylene glycol and its application in polyester fibers manufacture. Acta Polymerica Sinica (in Chinese), 2026, 57(7), 1480-1488. DOI： 10.11777/j.issn1000-3304.2026.26037. CSTR： 32057.14.GFZXB.2026.7601.

摘要

针对煤制乙二醇在聚酯合成过程中因对苯二甲酸双羟乙酯(BHET)脱水醚化导致聚酯品质降低的问题，系统研究了煤制乙二醇与对苯二甲酸的酯化反应行为. 通过核磁共振氢谱(

H-NMR)与液相色谱质谱联用(LC-MS/MS)等表征手段，对酯化反应中生成的目标产物BHET以及各种副产物，包括BHET二聚体、三聚体及双[2-(2-羟乙氧基)乙基

]

封端的BHET单体、二聚体和三聚体等进行了结构表征，揭示了煤制乙二醇酯化反应行为特征. 使用钛酸四丁酯催化剂抑制醚化副反应，并结合溶解度差异与薄层硅胶过滤等手段，分离并精制了BHET. 所得BHET纯度达99.14%，残留钛含量降至147 μg/g. 精制BHET经缩聚制备所得纤维级聚对苯二甲酸乙二醇酯(PET)经熔融纺丝得到聚酯纤维. 纤维的断裂强度和断裂伸长率与市售BHET在相同聚合、纺丝条件下制备的纤维的性能相当. 本文研究结果表明，经合理的酯化催化与单体BHET纯化，煤制乙二醇在聚酯纤维领域具备较强的应用潜力.

Abstract

To address the deterioration of polyester quality caused by the dehydration etherification of bis(2-hydroxyethyl) terephthalate (BHET) during polyester synthesis from coal-based ethylene glycol (EG)

the esterification behavior of coal-based EG with terephthalic acid was systematically investigated. The target product BHET and various by-products formed during the esterification reaction were structurally characterized by proton nuclear magnetic resonance spectroscopy (

H-NMR) and liquid chromatograph-tandem mass spectrometry (LC-MS/MS). These by-products included BHET dimers and trimers

as well

as BHET monomers

dimers

and trimers terminated with bis[2-(2-hydroxyethoxy)ethyl

]

groups. The results revealed the characteristic esterification behavior of coal-based EG. Tetrabutyl titanate was employed as a catalyst to suppress etherification side reactions. Combined with solubility differences and thin-layer silica gel filtration

BHET was effectively separated and purified. The purity of the obtained BHET reached 99.14%

and the residual titanium content was reduced to 147 μg/g. Fiber-grade poly(ethylene terephthalate) (PET) was prepared

via

polycondensation of the purified BHET and subsequently processed into polyester fibers by melt spinning. The tensile strength and elongation at break of the obtained fibers were comparable to those of fibers prepared from commercial BHET under the same polymerization and spinning conditions. These results demonstrate that

through appropriate esterification catalysis and BHET purification

coal-based ethylene glycol shows strong potential for application in the production of polyester fibers.

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Keywords

references

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