Polymer−Solvent Vapor−Liquid Equilibrium:  Equations of State versus Activity Coefficient Models

1998 ◽  
Vol 37 (4) ◽  
pp. 1567-1573 ◽  
Author(s):  
Hasan Orbey ◽  
Costas P. Bokis ◽  
Chau-Chyun Chen
Keyword(s):  
Activity Coefficient ◽  
Equations Of State ◽  
Equilibrium Equations ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Solvent Vapor ◽  
Activity Coefficient Models ◽  
Polymer Solvent ◽  
Vapor Liquid

New technique to measure high-pressure and high-temperature polymer-solvent vapor-liquid equilibrium

1997 ◽  
Vol 139 (1-2) ◽  
pp. 361-370 ◽  
Author(s):  
Rahul K. Surana ◽  
Ronald P. Danner ◽  
AndréB. de Haan ◽  
Nico Beckers
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
New Technique ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Solvent Vapor ◽  
Polymer Solvent ◽  
Vapor Liquid

QSPR generalization of activity coefficient models for predicting vapor–liquid equilibrium behavior

2007 ◽  
Vol 257 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Devipriya Ravindranath ◽  
Brian J. Neely ◽  
Robert L. Robinson ◽  
Khaled A.M. Gasem
Keyword(s):  
Activity Coefficient ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Equilibrium Behavior ◽  
Activity Coefficient Models ◽  
Vapor Liquid

VAPOR–LIQUID EQUILIBRIUM MODELING FOR MIXTURES OF HFC-32 + ISOBUTANE AND HFC-32 + HFO-1234ze(E)

2011 ◽  
Vol 19 (02) ◽  
pp. 93-97 ◽  
Author(s):  
RYO AKASAKA
Keyword(s):  
Free Energy ◽  
Helmholtz Free Energy ◽  
Equations Of State ◽  
Dew Point ◽  
Working Fluid ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
Equilibrium Modeling ◽  
Independent Variables ◽  
Vapor Liquid

Vapor–liquid equilibrium (VLE) have been successfully modeled for the binary mixtures of difluoromethane (HFC-32) + isobutane and difluoromethane + trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)). These mixtures are considered as possible replacements for conventional refrigerants far from negligible global warming potential (GWP). A multifluid approach explicit in the Helmholtz free energy forms the basis of the model. The independent variables are the temperature, density, and composition. Accurate published equations of state for pure HFC-32, isobutane, and HFO-1234ze(E) are incorporated to calculate the Helmholtz free energy of each component. Typical uncertainties of bubble- and dew-point pressures calculated using the model are within 2%. Although adjustable parameters of the model are determined only from experimental VLE data, it is highly probable that the model reasonably predicts other thermodynamic properties such as enthalpy and heat capacities. Therefore, the model allows practical design and simulation of refrigeration systems using the mixtures as a working fluid.

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