Dechlorination of polyvinyl chloride in NaOH/ethylene glycol solution by microwave heating

Fumio Osada, Toshiaki Yoshioka

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


This study investigated the dehydrochlorination of flexible polyvinyl chloride (PVC) containing 59.2% PVC, 29.7% dioctyl phthalate (DOP), and approximately 12% stabilizers. Flexible PVC was treated with NaOH/ethylene glycol (NaOH/EG) solutions at NaOH concentrations in the range 0.5-4 mol/l and was heated in a microwave heater at a temperature between 100° and 160°C for 0-30 min. All chlorides were completely eliminated by internal heating at 160°C using microwaves for 10 min in a 1 mol/l NaOH/EG solution, and the residue was made up of hydrocarbons. The weight loss rate reached a maximum of 74.7% at a temperature of 160°C. It was discovered that the use of microwaves significantly shortened the reaction time compared to using conventional electric heaters or other external heating systems and also allowed the use of lower concentrations of NaOH.

Original languageEnglish
Pages (from-to)19-22
Number of pages4
JournalJournal of Material Cycles and Waste Management
Issue number1
Publication statusPublished - 2009 Jan


  • Flexible PVC
  • Flexible PVC waste
  • High-temperature alkaline solution treatment
  • Microwave heating
  • Phthalic acid


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