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A general model, based on double film theory, is developed to study absorption with chemical reactions. In the liquid film region, the model is a set of differential equations that describe the mass transfer accompanying several chemical reactions; the resolution of the system is achieved by the finite difference method using an implicit scheme combined with Newton's method. Continuity equations and equilibrium coefficients are exploited in the treatment of the bulk region, which is based on the Newton-Raphson method; the results are used directly as boundary conditions in the liquid film equations. MaxwellStefan equations have been used as a rigorous approach in this model.

Salting effect of NaCl and KCl on the liquid-liquid equilibria (LLE) of water-ethyl acetate-ethanol system was investigated experimentally at 293.15 K and 1 atm. The salt mass percentages considered were 5 and 10%. The results show that the two electrolytes significantly affected the solubility of the solute in the organic phase, since its distribution coefficient increased with rising amount of electrolyte, causing a salting-out effect which was more pronounced for NaCl than for KCl and could be particularly useful to eliminate solutropy. Interaction parameters for an extended version of the UNIQUAC model were retrieved from the obtained experimental results by means of a combination of the Levenberg-Marquardt and the genetic algorithms.