امیرعباس ایزدپناه

Simplified hard chain dimer theory along with perturbed-chain statistical association fluid theory (PC-SAFT) that has been used by Nasrifar for binary systems of normal alkanes with high accuracy were expanded into binary systems like carbon dioxide-hydrocarbons and nitrogen-hydrocarbons. m, ? and ??k parameters were calculated for carbon dioxide, nitrogen, isobutane and isopentane. For describing phase equilibria in binary systems like carbon dioxide-hydrocarbons and nitrogen-hydrocarbons, we need binary interaction parameters (kij) in order to rectify dispersion interactions that this parameter were calculated by dividing equation of state on experimental data of vapor-liquid equilibria for these systems. Obtained results from developed model for binary systems like carbon dioxide-hydrocarbon were compared with SAFT equation of state and for binary systems like nitrogen-hydrocarbon with PC-SAFT equation of state. Results showed that model has better performance than these two equations of state. Finally, this model were used for predicting dew point temperature in a mixture of multi-component natural gas and also the resulted error of prediction of this model for these systems were fewer than PR and PPR78 equations of state.