Abstract
The vast amount of PET waste has made an enormous concern owing to its environmental pollution and human health effects. As an eco-friendly alternative option to treat plastic waste, this study investigated the transesterification of bis 2-hydroxyethyl terephthalate (BHET) into bis 4-hydroxybutyl terephthalate (BHBT) using 1, 4-butanediol (BDO) as a solvent in a typical batch reactor at various temperatures. Zinc acetate (Zn-A), antimony (III) oxide, tin (II) chloride, and titanium isopropoxide (Ti-IP) were utilized as catalysts. The effects of the experimental parameters, including the catalyst type, temperature, and catalyst loading, on the transesterification of BHET into BHBT were evaluated. Ti-IP and Zn-A showed higher catalytic activities than the other catalysts. Furthermore, Zn-A demonstrated to be a promising catalyst at lower temperatures, whereas Ti-IP exhibited higher activity at higher temperatures. An increase in temperature improved the yield of BHBT up to (0.99 mol/L) and showed the highest BHET conversion (98.93%) when Ti-IP was used as a catalyst at 210 °C. BHET conversion and the yield of BHBT were raised greatly when the catalyst amount was increased from 0.1 to 0.3 wt%. This study presents the transesterification of BHET using a Ti-IP catalyst as a novel technology for producing valuable BHBT for industrial applications.
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Abbreviations
- BHET:
-
Bis 2-hydroxyethyl terephthalate
- BHBT:
-
Bis 4-hydroxybutyl terephthalate BDO
- Zn-A:
-
Zinc acetate
- An-O:
-
Antimony (III) oxide
- Tn-Cl:
-
Tin (II) chloride
- Ti-IP:
-
Titanium isopropoxide
- PET:
-
Polyethylene terephthalate
- r-PET:
-
Recycled PET
- MHET:
-
Mono-2-hydroxyethyl terephthalate
- EG:
-
Ethylene glycol
- PBT:
-
Polybutylene terephthalate
- DMF:
-
Dimethylformamide
- GC/MS:
-
Gas chromatography–mass spectrometry
- THF:
-
Tetrahydrofuran
- HPLC:
-
High-performance liquid chromatography
- HHT:
-
4-Hydroxybuthyl 2-hydroxyethyl terephthalate
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Acknowledgements
This research is funded by LG Chem. K.R. acknowledges the research fund of Chungnam National University.
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Valizadeh, B., Chai, S., Chang, D.W. et al. Transesterification of Bis 2-Hydroxyethyl Terephthalate for Production of Bis 4-Hydroxybutyl Terephthalate over Homogenous Catalysts. Korean J. Chem. Eng. 41, 425–433 (2024). https://doi.org/10.1007/s11814-024-00056-x
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DOI: https://doi.org/10.1007/s11814-024-00056-x