In this work, in addition to the nitrous acid formed by reactive uptake of nitrogen dioxide (NO2) in water, it is proposed to reduce the nitrous ions levels by amino sulfonic acid (HSO3NH2) in a mechanically agitated reactor. To this end, the following parameters were considered: agitation speed, pH, temperature,
initial concentration of the reagents and their stoichiometric ratios. It was observed that the nitrous acid conversion (98.54%)
was enhanced in acidic medium (pH < 2.5), obeying a first-order reaction in relation to both reagents. A heterogeneous model
for nitrogen production was proposed and the kinetics for the gas–liquid process was formulated, where the kinetic rate constants
were in the range of 2.62–5.52 m3 kmol−1 s−1 and the gas–liquid mass transfer coefficients were in the range of 0.00502–0.00825 s−1.