Polycarbonate ethanolysis with imidazolium-based ionic liquids: Recovery of high-purity BPA and value-added by-product

Sojung Seo, Seung Hoon Lee, Joonbum Lee, Eunji Lee, Jeongbin Lee, Mooho Hong, Ji Hun Seo

Research output: Contribution to journalArticlepeer-review

Abstract

Depolymerization using ionic liquids (ILs) is an efficient and eco-friendly method for recycling waste poly(bisphenol A carbonate) (PC). To use IL for PC ethanolysis, the effect of IL structure on PC depolymerization should be investigated. In this study, we investigated PC ethanolysis using imidazolium-based ILs with different alkyl chain lengths (ethyl, butyl, and hexyl groups) as both the catalyst and solvent to afford the monomer bisphenol-A and a value-added byproduct, diethyl carbonate. 1-Ethyl-3-methyl imidazolium acetate ([EMIM][Ac]) exhibited the highest depolymerization efficiency, and an additional wash step increased the purity of the recovered BPA. A 100 % PC conversion rate, 90.9 % BPA yield, 99.9 % BPA purity, and 99 % [EMIM][Ac] reusability over five depolymerization cycles were observed in the PC ethanolysis using [EMIM][Ac]. In addition, recovered BPA behaved identically to commercially available BPA in the polymerization of PC. This strategy could help reduce the worldwide production of new BPA for PC synthesis.

Original languageEnglish
Article number100665
JournalMaterials Today Sustainability
Volume25
DOIs
Publication statusPublished - 2024 Mar

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd

Keywords

  • Depolymerization
  • Diethyl carbonate
  • Ethanolysis
  • Imidazolium-based ionic liquids
  • Polycarbonate
  • Reusability

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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