The absorption kinetics of NO in NaClO₂/NaOH solutions

A combined wet scrubbing SO_x/NO_x removal system is an advanced air pollution control process. In this process, the mechanism of NO removal is relatively unknown. Consequently, absorption of NO by alkaline solutions of NaClO₂ was studied to clarify the reaction kinetics. The experiments were carried out mainly at temperature 50°C which is the common operating temperature for wet scrubbers.The assumption that the absorption occurred under the fast pseudo-mth reaction regime was verified in the experiments. The absorption rate of NO into NaClO₂ solutions was found to be proportional to P_NO,0²and[NaClO₂]₀². The addition of NaOH to solutions of NaClO₂ decreased the absorption rate of NO. The absorption rate of NO at 25°C is lower than at 50°C. In the study, the absorption rate of NO did not change with changing gas flow rates.