| Abstract
| - A gas−liquid equilibrium-operational diagram showing the relationships between the concentration of total SO2, combined SO2, and true free SO2, iso-pH, and isopartial pressure of SO2 ispresented as a useful tool for graphically presenting the absorption of SO2 in the NaOH−SO2−H2O system. The graphical presentation of the absorption of SO2 on an industrial scale is studiedon a laboratory scale using a falling film reactor by taking into account scaled-down criteria forthe spray culumns of liquid−gas contactors. An example is given where the bulk and theinterfacial compositions along the contactor during the absorption of SO2 into 0.005 M NaOHat T = 298 K are simulated using an absorption model based on the film theory of gas absorption.This is then graphically presented in a design diagram with the concentration of Na+ as aparameter, which is reconstructed from the gas−liquid operational diagram for the NaOH−SO2−H2O system. The enhancement factor, the overall mass-transfer coefficient, the resistanceto the absorption of SO2 in the liquid and in the gas phase, and the fraction of the liquid resistancealong the falling film reactor are also calculated.
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