Measurement and Correlation of the Solubility of Carbon Dioxide in the Mixtures of Aqueous Monoethanolamine Solution and Benzoic Acid

Abstract

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.

NMR Techniques and Prediction Models for the Analysis of Species Formed in CO2 Capture Processes with Amine-Based Sorbents: A Critical Review

“…46 The K-E model 43 can be employed to calculate the equilibrium constants which is a function of temperature T (Eq. 2), 47 where the vapor-liquid equilibrium(VLE)model is applied to simulate ammonium speciation. 48 (2) ln 𝐾 𝑝 = -5851.11 𝑇 -…”

“…The popular thermodynamic models, including Kent–Eisenberg (K-E), Deshmukh–Mather (D-M), and E-NRTL models, can help scientists to predict important parameters for CO 2 capture processes . The K-E model can be employed to calculate the equilibrium constants, which is a function of temperature T (eq ), where the vapor–liquid equilibrium (VLE) model is applied to simulate ammonium speciation …”

CO2 Solubility in Hybrid Solvents Containing 1-Butyl-3-methylimidazolium Tetrafluoroborate and Mixtures of Alkanolamines

“…The density of [Bmim]­[BF 4 ] and all alkanolamines were tested using an Anton Paar DMA 5000 M vibrating U-tube densitometer that was calibrated using Ultrapure water obtained using an Elga Purelab Option-Q Millipore Device and dried air. Measured densities and refractive indices of all chemicals are provided in Table , along with previous measurements in literature. − Water content of all chemicals was also tested using a Metrohm 702 SM Titrino meter and was found to be 600 ppm for [Bmim]­[BF4], 400 ppm for monoethanolamine, and 500 ppm for diethanolamine and methyl-diethanolamine.…”

Density, Viscosity, Refractive Index, and Electrical Conductivity of Degraded Monoethanolamine Solutions at Standard Temperatures

“…Although many papers discuss the physical properties of the aqueous amine solutions either CO 2 -loaded or unloaded, − there is, surprisingly, very little published information about the physical properties of the degraded “real world” solvents in the literature. A few of the physical properties of the artificially degraded alkanolamine solvents, including density and refractive index, were recently reported .…”