Park, JY Lim, JS Lee, BG 2024-01-21T11:01:21Z 2024-01-21T11:01:21Z 2021-09-05 2002-03-30 0378-3812 https://pubs.kist.re.kr/handle/201004/139680 The vapor-liquid equilibrium data for six binary mixtures of isobutane + HFC-32, +HFC-125, +HFC-134a, +HFC-143a, +HFC-152a, and +HFC-227ea were correlated with the Peng-Robinson-Stryjek-Vera (PRSV) EOS combined with the NRTL excess free energy model and original Huron-Vidal (HVO) mixing rules. Almost all the calculated values with these models give good agreement with the experimental data. In addition, the nonideality of these binary mixtures was discussed by calculating the excess Gibbs energy at 303.15 K. Among these mixtures, four mixtures (isobutane + HFC-32, +HFC-134a. +HFC-152a, and +HFC-227ea) exhibit azeotropes. The measured azeotropic points were compared with calculated values by using the simple equations derived in this work from the fundamental equation-of-state and NRTL model. They show relatively good agreement with each other. In the range of experimental temperature, the NRTL parameters and azeotrope data were presented. (C) 2002 Elsevier Science B.V. All rights reserved. English ELSEVIER SCIENCE BV STATE EQUATION High pressure vapor-liquid equilibria of binary mixtures composed of HFC-32, 125, 134a, 143a, 152a, 227ea and R600a (isobutane) Article 10.1016/S0378-3812(01)00648-3 1 FLUID PHASE EQUILIBRIA, v.194, pp.981 - 993 FLUID PHASE EQUILIBRIA 194 981 993 scie scopus 000174775600084 2-s2.0-0037196785 Thermodynamics Chemistry, Physical Engineering, Chemical Thermodynamics Chemistry Engineering Article; Proceedings Paper STATE EQUATION vapor-liquid equilibria equation-of-state mixing rule Gibbs energy azeotrope HFC binary mixtures