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Transesterification of Bis 2-Hydroxyethyl Terephthalate for Production of Bis 4-Hydroxybutyl Terephthalate over Homogenous Catalysts

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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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Correspondence to Kosan Roh, Youngkwon Park or Myung Won Seo.

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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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