Paper presented at the 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Turkey, 19-21 July, 2010.
Supercritical fluid technologies are appied on a large industrial scale, e.g. for extractions and reactions. They are used in the food industry, pharmaceuticals and in the cosmetics domain. Carbon dioxide is the most widely used supercritical fluid because of its relatively low critical temperature (31 0C) and pressure (74 bar). In particular, its low critical temperature makes it highly suitable for processing heat-sensitive materials. The control of heat and mass transfer in the supercritical carbon dioxide requires knowledge of these thermodynamic properties. the Altunin and Gadetskii EoS was given to describe the thermodynamic properties of the pure carbon dioxide. The supercritical, the liquid and the gas atates of carbon dioxide are represented accurately. The original equation proposed by Altunin and Gadetskii and its tremendous importance in describing the carbon dioxide behaviour are analyzed.