Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Homologue Patterns of Polychlorinated Naphthalenes (PCNs) formed via Chlorination in Thermal Process

  • Ryu, Jae-Yong (Division for Industrial & Environmental Research, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Do-Hyong (Land Protection Branch, Georgia Environmental Protection Division) ;
  • Mulholland, James A. (School of Civil and Environmental Engineering, Georgia Institute of Technology) ;
  • Jang, Seong-Ho (Department of Bioenvironmental Energy, Pusan National University) ;
  • Choi, Chang-Yong (Division for Industrial & Environmental Research, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Jong-Bum (Division for Industrial & Environmental Research, Korea Atomic Energy Research Institute (KAERI))
  • Received : 2012.06.12
  • Accepted : 2012.08.10
  • Published : 2012.08.31
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Abstract

The chlorination pattern of naphthalene vapor when passed through a 1 cm particle bed of 0.5% (mass) copper (II) chloride ($CuCl_2$) mixed with silicon dioxide ($SiO_2$) was studied. Gas streams consisting of 92% (molar) $N_2$, 8% $O_2$ and 0.1% naphthalene vapor were introduced to an isothermal flow reactor containing the $CuCl_2/SiO_2$ particle bed. Chlorination of naphthalene was studied from 100 to $400^{\circ}C$ at a gas velocity of 2.7 cm/s. Mono through hexachlorinated naphthalene congeners were observed at $250^{\circ}C$ whereas a broader distribution of polychlorinated naphthalenes (PCNs) including hepta and octachlorinated naphthalenes was observed at $300^{\circ}C$. PCN production was peak at $250^{\circ}C$ with 3.07% (molar) yield, and monochloronaphthalene (MCN) congeners were the major products at two different temperatures. In order to assess the effect of a residence time on naphthalene chlorination, an experiment was also conducted at $300^{\circ}C$ with a gas velocity of 0.32 cm/s. The degree of naphthalene chlorination increased as a gas velocity decreased.

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References

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