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The volumetric mass transfer coefficient (K G .a) for SO 2 removal from gas mixture into aqueous Na 2 SO 3 solution was studied in a plate column at constant temperature (25 , and liquid holdup. The K G .a values were evaluated over ranges of operating independent variables: gas flow rate (Q G), SO 2 concentration in inlet gas (C SO2, in), and concentration of aqueous Na 2 SO 3 solution (C Na2SO3). The experimental results showed that K G .a decreased with increasing of C SO2, in , increased with increase of Q G , and C Na2SO3. The influence of gas flow rate on K G .a is more than the influence of SO 2 concentration in inlet gas, and concentration of aqueous Na 2 SO 3 solution respectively. Computer program Statgrhaphics/Experimental design was used to find the linear fitted models of the K G .a in terms of the dimensional and dimensionless of independent operating variables. The Q G , C SO2, in , and C Na2SO3 have significant effects on K G .a, while the interactions of them have no significant effects on it, and could be neglected. The R-squared statistic indicates that the model as fitted explains 90.4949% of the variability in K G .a.

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