Controlling generation of benzenes and polycyclic aromatic hydrocarbons in thermolysis of polyvinyl chloride in CO2

Taewoo Lee, Jeong Ik Oh, Taejin Kim, Chiu Wa Tsang, Ki Hyun Kim, Jechan Lee, Eilhann E. Kwon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)

Abstract

This study emphasizes the control of benzene derivatives and polycyclic aromatic hydrocarbons (PAHs) in thermolysis of polyvinyl chloride (PVC) using CO 2. To this end, the generation of benzenes and PAHs from the thermolysis of PVC in N 2 was characterized and all experimental findings from the thermolysis of PVC in N 2 were used as the reference value to configure the role of CO 2 in the thermolysis of PVC. The formation of hydrogen chloride (HCl) followed by the subsequent dechlorination in the thermolysis of PVC in N 2 resulted in the high yield of charring compounds, providing a favorable condition for forming benzene derivatives and PAHs. However, the thermal degradation of PVC in CO 2 showed the genuine thermal degradation patterns. For instance, despite the presence of the source for oxygen, the formation of CO at temperatures higher than 600 °C was observed in the thermolysis of PVC in CO 2, suggesting that some unknown reactions between hydrocarbons from the thermolysis of PVC and CO 2 are initiated to form CO. In addition to these unknown reactions, the enhanced thermal cracking induced by CO 2 was observed. Two identified roles of CO 2 during the thermolysis of CO 2 was only limited at temperatures higher than 600 °C. However, despite no precise description for the mechanistic role of CO 2 at this stage of study, the formation of benzene derivatives and PAHs was effectively controlled in the presence of CO 2 at temperatures higher than 480 °C. Thus, these empirical findings in this study are necessary to further be investigated in the future, which offers a great venue offering a new means for modifying and/or controlling the harmful chemical species.

Original languageEnglish
Pages (from-to)453-459
Number of pages7
JournalEnergy Conversion and Management
Volume164
DOIs
Publication statusPublished - 15 May 2018

Keywords

  • Benzene
  • Carbon dioxide
  • PAHs
  • Polyvinyl chloride
  • Pyrolysis
  • Waste disposal

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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