Impact of the Binary Interaction Parameter Effect on the Phase Diagram

This paper deals with fitting of the binary interaction parameter for the Peng- Robinson equation of state using landmarks in the binary phase space such as K- and L-points . K- and L-points for the ethane + ethanol system were calculated using differentvalues for the binary interaction parameter and It was observed that the location of K- and L-points varied significantly in P-T space with change in the binary interaction parameter. Additionally , a single value of the binary interaction parameter was not able to predict both K- and L-points well and a single value of binary interaction parameter without a pressure and/or temperature dependence was unable to predict the presence of both the K- and L-points simultaneously. The system exhibitsType-V phase behavior experimentally but The binary interaction parameter fitted using an L-point predicts Type-II phase behavior whereas the binary interaction parameter fitted using a K-point predicts Type-III phase behavior for the system. Not only did the binary interaction parameter fitted using a K- or an L-point fail to predict the correct type of phase behavior

Keywords:

Binary Interaction , K-Point , L-Point , Phase Diagram