Measurement and modeling of high-pressure (vapor+liquid) equilibria of (CO2+alkanol) binary systems

Abstract

a b s t r a c tComplementary isothermal (vapor + liquid) equilibria data are reported for the (CO 2 + 3-methyl-2-butanol), (CO 2 + 2-pentanol), and (CO 2 + 3-pentanol) binary systems at temperatures of (313, 323, and 333) K, and at pressure range of (2 to 11) MPa. For all (CO 2 + alcohol) systems, it was visually monitored that there was no liquid immiscibility at the temperatures and pressures studied. The experimental data were correlated with the Peng-Robinson equation of state using the quadratic mixing rules of van der Waals with two adjustable parameters. The calculated (vapor + liquid) equilibria compositions were found to be in good agreement with the experimental data with deviations for the mole fractions <8% and <2% for the liquid and vapor phase, respectively.

Toward Nonaqueous Alkanolamine-Based Carbon Capture Systems: Parameterizing Amines, Secondary Alcohols, and Carbon Dioxide-Containing Systems in s-SAFT-γ Mie

“…As for primary alcohol/CO 2 systems, the possibility of fitting near-critical data was precluded by ensuring that no type III or IV systems were considered in the regression. Indeed, the 2-butanol/CO 2 and 2-pentanol/CO 2 systems are type I or type II systems. − Further, a literature survey by Sima et al suggests that 2-propanol/CO 2 appears to be either a type I or type II system. Regressions with the 2-butanol/CO 2 VLE resulted in model predictions of liquid–liquid phase splits for that system.…”

Predicting the Solubility of CO2 in Toluene + Ionic Liquid Mixtures with PC-SAFT

“…Predictive models, which do not require fitting of parameters to data of ternary (or higher) systems, are particularly needed. For high-pressure systems involving CO 2 and organic solvents, the φ–φ isofugacity approach, using a cubic equation of state and a mixing rule with one or two adjustable parameters ( k ij and l ij ), has been applied in order to adequately correlate LV equilibrium. , In the case of CO 2 + IL binary mixtures, the same φ–φ concept can be used, , but critical properties, that are required for cubic equations of state, are usually not available for ILs. Valderrama and co-workers − have developed a group contribution method to estimate the pure component critical properties for ILs, which can be used in cubic equations of state.…”