Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

Abstract

Abstract The absorption rates of NO into aqueous solutions of NaClO 2 blended with Na 2 CO 3 were investigated in a stirred reactor. The experimental results showed that the reaction rate could be expressed as $ N_{\rm NO} = {\sqrt {0.172C_{\rm i}^3 C_{\rm BL}}} $ . An equation for a second‐order reaction rate constant between NO and NaClO 2 , k mn = 5.79 · 10 15 exp(–5557.26/ T ), was obtained. The addition of Na 2 CO 3 into the solution of NaClO 2 decreased the reaction rate constant. The optimal absorption conditions involved a NO concentration of 540 ppm, NaClO 2 concentration of 50 mol m –3 , Na 2 CO 3 concentration of 10 mol m –3 , temperature of 333 K and O 2 concentration of 4 %, which were determined by an orthogonal experiment. Under these optimal conditions, it was possible for the absorption rate to reach up to 1.9271 · 10 –5 mol/(s m 2 ).