Abstract
To determine the gradient of the partial pressure for the nitrogen dioxide absorption in industrial plants for the manufacture of nitric acid it is essential to know the gas condition and the state of equilibrium above the scrubbing liquid. The continuous oxidation of the nitrogen oxide primarily present and that of the nitrogen oxide resulting from absorption must be taken into account. Wetted wall columns and a pilot plant as well as an industrial plant were used to study the factors influencing the absorption rate constant, such as diameter of the wetted wall columns and Raschig rings, gas velocity, quantity of scrubbing liquid, concentration of the nitric acid and of the gas containing nitrogen oxides. These investigations led to an empirical relation for the absorption rate constant.
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