Towards recycling purpose: Converting PET plastic waste back to terephthalic acid using pH-responsive phase transfer catalyst

Yueqing Wang; Hongxing Wang; Hongmei Chen; Hantao Liu

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Towards recycling purpose: Converting PET plastic waste back to terephthalic acid using pH-responsive phase transfer catalyst

Full Length Article | Updated：2026-01-06

- Towards recycling purpose: Converting PET plastic waste back to terephthalic acid using pH-responsive phase transfer catalyst
- Chinese Journal of Chemical Engineering Vol. 51, Issue 11, Pages: 53-60(2022)
- Affiliations：
  
  1. School of Energy and Power Engineering, North University of China,Taiyuan,China,030051
  2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences,Taiyuan,China,030001
  3. School of Instrument and Electronics, North University of China,Taiyuan,China,030051
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2022
- Accepted：
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Yueqing Wang, Hongxing Wang, Hongmei Chen, Hantao Liu. Towards recycling purpose: Converting PET plastic waste back to terephthalic acid using pH-responsive phase transfer catalyst[J]. Chinese Journal of Chemical Engineering, 2022, 51(11): 53-60.
DOI：

Yueqing Wang, Hongxing Wang, Hongmei Chen, Hantao Liu. Towards recycling purpose: Converting PET plastic waste back to terephthalic acid using pH-responsive phase transfer catalyst[J]. Chinese Journal of Chemical Engineering, 2022, 51(11): 53-60. DOI：

摘要

Abstract

Converting polyethylene terephthalate (PET) wastes to its monomer and valuable chemicals

via

eco-friendly chemical method is still a challenge task. Previously

phase transfer catalysts used for alkaline hydrolysis were soluble in reaction media and hardly separated after reaction. Here

we reported several pH-responsive catalysts combined alkyl quaternary ammonium units with heteropolyacid anion for achieving stepwise product/catalyst separation and catalyst recycling. The properties of homogeneous/heterogeneous transfer behavior allow catalyst to be easily separated from reaction media by adjusting of pH value. Among them

N(CH

)

]

(abbreviated as [CTA

]

PW) exhibits the highest activity and the most suitable pH responsive values. Such a pH triggered switchable catalytic system not only shows good performance for depolymerization of pure PET

but also some real PET wastes such as coloured trays and PE/PET complex films could be completely degraded into terephthalic acid. Additionally

the reaction kinetics and activation energy of PET alkaline hydrolysis also studied with and without

pH-responsive [CTA

]

PW.

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