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Inzynieria Chemiczna i Procesowa, Vol.16, No.1, 159-165, 1995
DETERMINATION OF GAS-LIQUID EQUILIBRIUM QUANTITIES USING EXPERIMENTAL SETUP FOR KINETIC MEASUREMENTS
The method of determination of phase equilibria using experimental setup for kinetic measurements of absorption, chemisorption, adsorption and extraction processes is presented. The method is described for sulfur dioxide-sodium bisulfite-sodium sulfite system. The installation used was designed for kinetic measurements of absorption of SO2 by solution of sodium sulfites in a packed column. Experimental setup is shown in Fig. 1. The main part of the apparatus is a glass column 4 filled with Raschig rings. The column was sprinkled with sodium bisulfite-sodium sulfite solution at a given temperature and concentration of the components. Glass columns 1 and 2 were used to obtain a gas mixture containing sulfur dioxide of a given concentration and humidity at a constant temperature. The installation is provided with the equipment for measurements of temperature t, pressure P, flow rate V and concentration of SO2 in the outlet gas AG. The measurements consisted in pinpointing the moment when the process changed from the absorption of SO2 by the solution to desorption or, alternatively, when the changeover occurred in the opposite direction. To achieve this, the SO2 concentration in the inlet gas was varied to enforce the absorption of desorption process. Concentrations of SO2 in the inlet and outlet gas were obtained for various mass transfer directions in the packed column. The equilibrium partial pressure of sulfur dioxide over the solution of a given-composition was determined graphically. Experimental values of SO2 concentrations were plotted in the system of co-ordinates shown in Fig. 2, and then the point of intersection of the experimental curve and the diagonal of the system of coordinates was found. The reults obtained by means of the method described above ale compared with those obtained by the traditional method (see Fig. 3). As can be seen from the figure good agreement of the results has been obtained. This points to the possibility of application of the method described above to the examinations of phase equilibria.