Prediction of phase behavior, Henry's constants, and infinite dilution partial molar volumes for carbon dioxide and carbon monoxide in n-paraffins

Abstract

Expressions for Henry's constant ( H i ) and infinite dilution partial molar volume ( v ̃ i ∞ ) have been derived from the generalized cubic equation-of-state (EOS). A database for the binary solubility of carbon dioxide and carbon monoxide in n-paraffins is assembled to evaluate the Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) EOS as a correlation framework to describe the phase behavior of these systems and as means to predict H i and v ̃ i ∞ . Five cases are employed in the EOS evaluations through the use of bubble-point pressure calculations. For each case, interaction parameters along with H i and v ̃ i ∞ are obtained for both equations. The SRK and PR EOS have shown to be capable of representing the phase behavior of carbon dioxide and carbon monoxide in n-paraffin binary systems. The ability of the SRK and PR EOS to predict H i and v ̃ i ∞ is assessed using the optimum predictive case, in which two interaction parameters are employed for each isotherm of each binary system. H i predictions from both the SRK and PR EOS are in good agreement with the available experimental values for the tested systems.