Use of the refractive index in the estimation of thermophysical propertiesof hydrocarbons and petroleum mixtures

In this paper we show application of the refractive index in the estimation of various thermodynamic and physical properties of pure hydrocarbons and undefined petroleum mixtures. In particular, we demonstrate how one can use the refractive index to estimate equation of state parameters, critical co nstants, the composition of petroleum mixtures, and temperature-dependent p roperties such as heat capacity, PVT, and transport properties of hydrocarb on fluids. The refractive index is an easily measurable property; however, when it is not available, methods of estimation of this property through ot her available parameters are also presented.