Group Contribution Approach in Simulation of DEC Separation Technique

Based on chemical equilibria in acid-base reactions and on precipitation of the resulting compounds in dissociation extractive crystallization (DEC) process, a separation model has been developed. The model utilizes the modified UNIFAC group contribution method. The validity of the model has been assessed by the experimental results achieved in the separation of o- and p-chlorobenzoic acids. The results have been compared with those obtained from the experiments at various concentrations and temperatures on predicted ternary diagrams.