An accurate equation of state for carbon dioxide.

Abstract

An equation of state for carbon dioxide is developed here that yields high accuracy in P-V-T calculations over wide ranges of temperatures (216-423K) and pressures (to 310.3MPa). It is particularly accurate around the critical region due to the use of "nonanalytical" terms to model the critical isotherm. Thus it is suited to applications in supercritical states. The density calculation is reliable to within 0. 1-0.2 % outside the critical region, and to within 1 % near the critical point. The equation has also been tested for vapor pressure and enthalpy calculations (with deviations less than 0.06 %, and 2-5 J/g, respectively). Comparison with a number of existing equations of state shows that the present equation is more dependable.

Controls on CO 2 storage security in natural reservoirs and implications for CO 2 storage site selection

“…1). These data are used to calculate CO2 state and density for each case 138 study using the equation of state developed by Huang et al (1985) which is an extended 139…”

CO2-Mineral Reaction in a Natural Analogue for CO2 Storage--Implications for Modeling

“…volume fraction of porespace filled with gas phase); M CO2 is weight fraction of CO 2 in gas phase, both supplied by Tullow oil; ρ gas is density of the gas phase under reservoir conditions, assumed to be an ideal mix of CO 2 and methane, with CO 2 density from the equation of state by Huang et al, (1985). Sol CO2 is the solubility of CO 2 in the porewaters under reservoir conditions, corrected for a porewater salinity of approximately 9000 ppm NaCl from an analysis supplied by Tullow Oil (Spycher et al, 2003).…”

Measurement of solubilities for rhodium complexes and phosphine ligands in supercritical carbon dioxide

“…The molarities in mol L -1 of the solute in supercritical carbon dioxide were determined using the absorbance from the calibration curves. Then, the obtained solubitlities were converted to a mole fraction basis using the densities of pure carbon dioxide calculated with the equation of state [18]. The accuracies of the solubility data were within 5 % for the ligands and 10 % for the Rh complexes.…”

“…C is the temperature dependent constant related to the enthalpies of vaporization and solvation. The densities of carbon dioxide were calculated by the equation of state proposed by Huang et al [18]. The parameters k and C were determined from the solubility data obtained in this work.…”