Determination of Interaction Parameters for UNIFAC for Chlorinated and Fluorinated Hydrocarbons using Binary Vapor\Liquid Equilibrium Data
Chlorinated and fluorinated hydrocarbons have been identified as primary culprits in the deterioration of the ozone layer. These hydrocarbons are widely used as refrigerants, blowing agents for foams, and polymeric materials. To help eliminate the ozone problem, phase equilibrium behavior of refrigerants must be predicted so that substitutes may be developed. The UNIFAC group contribution method has proven to be a very useful approach in predicting phase equilibrium behavior. The benefit of a group contribution method is that equilibrium behavior can be predicted without knowledge of the structure of the compound, but just simply knowing the number of UNIFAC groups and the interactions between them. However, numerous interaction parameters between UNIFAC main groups with chlorines and fluorines have not been determined. This work focuses in determining these interaction parameters from binary vapor liquid equilibria with experimental data showed that good accuracy can be obtained with currently used UNIFAC groups.