Formation behavior of PCDD/Fs in PVC pyrolysis with copper oxide.
Formation and decomposition behaviors of PCDD/Fs during pyrolysis of polyvinyl chloride (PVC) with CuO have been investigated. These reactions proceed simultaneously, and the rate of decomposition exceeds that of formation with further retention. More 2,3,7,8-TCDD is formed when the dechlorination of PCDD/Fs proceeds significantly. Homologue profile patterns of PCDD/Fs show that the fractions of O8CDD and H6CDFs are relatively larger within PCDDs and PCDFs, respectively. Extremely large amounts of PCDD/Fs are obtained with the long retention time at 200 degrees C. The formation of PCDD/Fs decreases drastically with increase in the molar ratio of CuO/PVC. The acceptability of thermodynamic calculations on the formation of PCDD/Fs is also investigated. The thermodynamic calculated tendency of the effect of oxygen on the formation of PCDD/Fs agrees well with the experimental results, although absolute values of the amount of PCDD/Fs are much different.
Shibata
Etsuro
E
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 1,1 Katahira, 2-Chome, Aobaku, Sendai 980-8577, Japan. etsuro@tagen.tohoku.ac.jp
Yamamoto
Satoru
S
Kasai
Eiki
E
Nakamura
Takashi
T
D001572:Benzofurans / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D000072338:Dibenzofurans, Polychlorinated; D017745:Incineration / Q000379:methods*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000737:chemistry*; D011143:Polyvinyl Chloride / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins; D003300:Copper; D011143:Polyvinyl Chloride; C030973:cupric oxide