Thermal stability of chloroform in the steam-condensate cycle of CANDU-PHW nuclear power plant |
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Authors: | Louis L pine,Roland Gilbert,Lorenzo Ouellet |
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Affiliation: | Louis Lépine,Roland Gilbert,Lorenzo Ouellet |
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Abstract: | Analysis of samples taken at the Gentilly 2 (Québec) CANDU-PHW (CANadian Deuterium Uranium - Pressurized Heavy Water) plant after chlorination and demineralization revealed the presence of all four trihalomethanes (THMs) (CHCl3, CHBrCl2, CHBr2Cl and CHBr3) and other unidentified halogenated volatile compounds. Among the THMs, chloroform was the major contaminant. A study of its thermal stability in water at different temperatures confirmed the degradation of the CHCl3 molecule according to the equation CHCl3 + H2O → CO + 3 HCl. The reaction follow a first order kinetics and has an activation energy of 100 kJ/mol. The estimated half-life is six seconds at 260°C, the maximum temperature of the steam-condensate cycle. |
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Keywords: | trihalomethanes chloroform thermal stability hydrolysis degradation kinetics |
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