Abstract
In this study, viscosity of nine members of alcohol group as the polar compounds in a wide range of pressure and temperature based on total number of 1090 viscosity set data have been investigated. Theoretical viscosity estimation models, such as free volume, Eyring's and friction theory were studied by coupling with common used and simple EoSs such as PR and SRK and also complicated and specific EoSs for polar and associating compounds such as CPA and PC-SAFT. In general using from CPA and PC-SAFT decrease the values of error for all of the viscosity models, but the effect of these equations of state is more impressive for the friction theory and can decrease the AARD% value about 3.8 times. In the free volume and Eyring's theories although decreasing the errors can be seen by CPA and PC-SAFT but this decreasing is not impressive like friction theory. All of the viscosity theories coupled with all of the equations of state investigated here can estimate with a good agreement viscosity-temperature Arrhenius like behavior of alcohols at constant pressure, but the EoSs have a great effect on the viscosity-pressure near to linear behavior of alcohols at constant temperature.
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