CFC12 Decomposition by DC Corona Discharge Process
Koichi KINOSHITA, Takaaki MORIMUNE
Paying attention to the depletion of the ozone layer due to CFC's, the authors investigated the CFC12 decomposition by electrical method. CFC12 was excited by passing through a corona discharge tube and decomposed to elementary substances in a high electric voltage field. Decomposed gas was introduced into the treatment vessel in which H2O and Ca (OH) 2 were filled in order to control by-products. In this paper, the preliminary experimental data were analyzed, and the CFC12 decomposition rate was obtained by using the gas chromatograph (GC). We found that i) 99% CFC12 decomposition rate was obtained at an input power of about 190W. However, decomposition rate decreased to 30% after 40 minutes from the start of corona discharge, ii) CFC12 decomposition rate increased about 10% by cooling reactor, iii) almost no byproducts were detected in the exhaust gas, while Cl2 and F ions were detected 75ppm and 25-50ppm respectively in the treatment vessel, and iv) CFC12 decomposition quantity by corona discharge process was larger than that of DC arc plasma process.
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