Evaluation of vapor-liquid equilibrium of ethane binary systems using UNIQUAC-based mixing rules and its extension to multicomponent systems

In order to investigate the ability and accuracy of the UNIQUAC-based SRK E OS for prediction of high-pressure vapor-liquid equilibrium (VLE) the UNIQU AC parameter for 19 ethane binary systems have been determined. The missing binary interaction parameters are reported for PSRK, MHV1, MHV2, and LCVM mixing rules. These parameters were determined using the VLE experimental d ata reported in literature. The percentage average relative pressure error for 19 C2H6 binary systems i s 1.93, 1.99, 2.21, and 2.03 using PSRK, MHV1, MHV2, and LCVM mixing rules, respectively. The regressed binary interaction parameters then, without any further modif ication, were applied to six multicomponent systems over a wide range of te mperature covering more than 300 data points. The calculated percentage ave rage relative pressure error for six multicomponent systems is 3.47, 3.75, 5.57, and 4.51 for PSRK, MHV1, MHV2, and LCVM mixing rules, respectively. Based on the results obtained in this study, it is concluded that the PSRK/ UNIQUAC model has reasonable accuracy for VLE calculations and gives the mo st accurate results among the four mixing rules tested. (C) 2000 Elsevier S cience B.V. All rights reserved.