20 Absorption of nitrogen oxides into water
1980; Elsevier BV; Volume: 35; Issue: 1-2 Linguagem: Inglês
10.1016/0009-2509(80)80082-0
ISSN1873-4405
AutoresHiroshi Komiyama, Hakuai Inoue,
Tópico(s)Air Quality Monitoring and Forecasting
ResumoAbsorption of NO2 and NONO2 mixture into weak alkaline solutions are studied. Emphasis is put on the concentration level ranging from 5000 down to 5 ppm. The absorption rates and the stoichiometric relations are determined by simultaneously measuring the gas and liquid phase compositions. Flat-liquid-level absorber and bubbling type absorber are employed for testing the effects of mass transfer coefficient. The absorption rates of NO2 depend on the concentration of NO2 in second order at the concentrations above around 800 ppm. At the lower concentrations, the rate dependency changes to 1 1/2 order in NO2 and, in the case of rather large mass transfer coefficients, it further changes to 1'st order. The absorption rates from NO and NO2 mixtures change in 3/4 order with respect to the product of NO and NO2. A model is constructed by postulating the equilibrations between NO, NO2, N2O3 and N2O4 and the hydration reactions of N2O3 and N2O4 in the liquid film. The computational results based on the model agree well with the all present experiments as well as those in literature. The parameters required for predicting the absorption, including the solubilities of NO2 and N2O4, the hydration rates of N2O3 and N2O4 and the equilibrium constants, have been established.
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