CALCULATIONS OF COMPRESSED CARBON-DIOXIDE VISCOSITIES

Compressed carbon dioxide is widely used as a solvent in supercritical and liquefied gas extraction. The knowledge of the fluid-phase viscos ity as a function of temperature and pressure is indispensable for pre dicting the hydrodynamics and mass-transfer rates in these processes. Various equations, both generally valid and especially derived for car bon dioxide, are compared with published experimental data covering ga s, liquid, and supercritical regions. The equations of Vesovic et al. and of Altunin and Sakhabetdinov are recommended as most reliable for predicting the viscosity of dense carbon dioxide.