Mechanochemical dechlorination of polyvinyl chloride with calcium sulfates

William Tongamp, Junya Kano, Kibu Chiyo, Fumio Saito

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Polyvinyl chloride (PVC) was milled with hydrated or unhydrated calcium sulfates (CaSO4•2H2O or CaSO4) in air by using a planetary mill to investigate mechanochemical dechlorination behavior. The milling process resulted in size reduction and in the breaking of bonds leading to mechanically induced solid state reaction, forming CaCl2 and dechlorinated hydrocarbon with C=C double bonds in the product. Washing the milled mixtures with water at room temperature allowed removal of the chloride formed during milling, and more than 95% of the chlorine in PVC was removed from a mixture milled for 4 h. This process could offer a potential route for the handling and disposal of both PVC and gypsum wastes. H2S gas was generated during milling; more H2S was released from the unhydrated sample than from the hydrated sample.

Original languageEnglish
Pages (from-to)140-143
Number of pages4
JournalJournal of Material Cycles and Waste Management
Issue number2
Publication statusPublished - 2008 Sept 1


  • Calcium sulfates
  • Mechanochemical dechlorination
  • Milling
  • Polyvinyl chloride
  • Waste gypsum

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Mechanics of Materials


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