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KMID : 1024520120210080891
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Journal of the Environmental Sciences
2012 Volume.21 No. 8 p.891 ~ p.899
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Homologue Patterns of Polychlorinated Naphthalenes (PCNs) formed via Chlorination in Thermal Process
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Ryu Jae-Yong
Kim Do-Hyong
Mulholland James A
Jang Seong-Ho
Choi Chang-Yong
Kim Jong-Bum
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Abstract
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The chlorination pattern of naphthalene vapor when passed through a 1 cm particle bed of 0.5% (mass) copper (II)
chloride (CuCl2) mixed with silicon dioxide (SiO2) was studied. Gas streams consisting of 92% (molar) N2, 8% O2 and 0.1%naphthalene vapor were introduced to an isothermal flow reactor containing the CuCl2/SiO2 particle bed. Chlorination of naphthalene was studied from 100 to 400 oC at a gas velocity of 2.7 cm/s. Mono through hexachlorinated naphthalene
congeners were observed at 250 oC whereas a broader distribution of polychlorinated naphthalenes (PCNs) including hepta and octachlorinated naphthalenes was observed at 300 °C. PCN production was peak at 250 o
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 oC with a gas velocity of 0.32 cm/s. The degree of naphthalene chlorination increased as a gas velocity decreased.
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KEYWORD
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PCN (polychlorinated naphthalene), Chlorination, Copper (II) chloride, Homologue distribution
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