Modified Redlich⿿Kwong equation of state for supercritical carbon dioxide

New Functionality for Energy Parameter of Redlich-Kwong Equation of State for Density Calculation of Pure Carbon Dioxide and Ethane in Liquid, Vapor and Supercritical Phases

“…AARD% of the CO 2 densities obtained in this work was compared with AARD% reported in the works of Jouyban et al [8], Bahadori et al [8], Haghbakhsh et al [8] and Heidaryan and Jarrahian [10] to indicate the validity and the advantages of the present model (in Table 5). This comparison shows that all previous models were done only for supercritical phase while the present model is applicable for liquid, vapor and supercritical phases.…”

“…In this work, a new expression for energy parameter of Redlich-Kwong EoS as a function of temperature and pressure similar to the modification of Heidaryan and Jarrahian [10] and similar to our previous work [16] but with new functionality was proposed to improve the density description of carbon dioxide and ethane for wide ranges of temperature and pressure in the liquid, vapor, and supercritical phases. In our previous work [16], the proposed Redlich-Kwong equation of state was used for calculating of solid solubility in supercritical carbon dioxide.…”

“…However, the cubic equations of state are inaccurate for the density calculation especially for the liquid densities under saturation and near critical densities. Heidaryan and Jarrahian [10] proposed a simple and explicit reduced temperature and reduced pressure expression to modify the density description of carbon dioxide, in the supercritical region by using the Redlich-Kwong equation of state. They fitted the parameters with the pure supercritical carbon dioxide density data.…”

A New Simple Equation of State for Calculating Solubility of Solids in Supercritical Carbon Dioxide

“…Therefore, β 11 -β 12 and β 21 -β 22 are the parameters belonging to solute and CO 2 , respectively. In this investigation, two differences exist in comparison with the work of Heidaryan and Jarrahian [18]. First, the β function includes two parameters for each compound in this work, but the b function includes six parameters for each compound in the work of Heidaryan and Jarrahian [18].…”

“…For calculating the molar volume of supercritical CO 2 , Heidaryan and Jarrahian [18] proposed a correction for energy parameter of RK equation of state as a function of reduced pressure and temperature. In this work, for better calculation of solid solubility in supercritical phase, a new correction for energy parameter of RK EOS is proposed as a function of reduced temperature:…”