PREDICTION OF PHASE-EQUILIBRIA FOR THE SYSTEMS CONTAINING AMMONIA USING PRASOG

In order to extend the applicability of a Peng-Robinson group contribu tion method called PRASOG to ammonia-containing systems, the group pai r parameters were determined using binary vapor-liquid and vapor-liqui d-liquid equilibrium data. The vapor-liquid and vapor-liquid-liquid eq uilibria were predicted using the determined parameters for the binary and ternary systems containing ammonia, paraffins, olefins, water, al cohols, and nitriles. The predictive accuracy of liquid-liquid equilib ria using group pair parameters from liquid-liquid equilibrium data is compared with those using the parameters from vapor-liquid equilibriu m data. (C) 1998 Elsevier Science B.V.