The solubility of water in the CO2-rich phase was measured in the presence of hydrate using an indirect method at the temperatures ranging from (274 to 294) K and pressures of (6.1 and 10.1) MPa. The experimental data set of Song and Kobayashi (SPE Form. Eval.
1987, 2, 500−508) was previously reported for this system, and a large pressure dependence was observed at the pressures of (6.21 and 10.34) MPa. The present solubility data were compared with published experimental data at the hydrate-free region. A weak pressure dependence was observed compared with the data of Song and Kobayashi in the present measurements.
The solubility of CO2 in the mixture of aqueous
monoethanolamine
(MEA) with benzoic acid was measured and correlated using a reaction-phase
equilibrium model. The solubility of CO2 in 15 wt % aqueous
MEA solution was measured at a temperature of 313.2 K and pressures
up to 200 kPa. Also, the solubility of CO2 in the mixtures
with various weight ratios of benzoic acid, MEA, and water were measured
at a temperature of 313.2 K and pressures ranging from (1 to 250)
kPa. The weight ratios (acid/MEA/water) were 1:15:85, 2:15:85, 10:15:85,
15:15:85, 1:14:85, 2:13:85, and 5:10:85. Reaction equilibrium constants
of the Kent–Eisenberg model were used for the CO2–MEA–water mixture, and new equilibrium constants involving
benzoic acid were estimated using experimental data. The concentration
of species in the liquid phase was estimated as a function of CO2 loading, and the effect of adding benzoic acid can be predicted
within reasonable accuracy using the proposed model.
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