Simple method for determining CO2 loading of partially carbonated aqueous ammonia solutions using pH and density measurements

Stec, Marcin; Spietz, Tomasz; Chwoła, Tadeusz; Tatarczuk, A.; Krótki, A.

doi:10.1016/j.ijggc.2019.05.015

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…The density model obtained in this work is not only able to reproduce the experimental density values used for parameter estimation with an average absolute relative deviation (AARD) of 0.3%, as indicated in Table , but it can also reproduce experimental density values available in the literature for aqueous solutions containing ammonia and carbon dioxide. Figure shows the deviation of the experimental density values measured in this work and available in the literature , from the density predictions obtained with the model of eq using the parameters listed in Table .…”

Section: Resultsmentioning

confidence: 87%

“…Relative differences Δρ/ρ = (ρ exp – ρ model) /ρ model of the experimental densities, ρ exp , of aqueous (NH 3 + CO 2 ) solutions at atmospheric pressure from values of density estimated with the model defined in eq with parameters listed in Table , as a function of (a) density ρ; (b) temperature T ; (c) apparent NH 3 concentration in solution b̂ NH 3 ; and (d) apparent CO 2 concentration in solution b̂ CO 2 : ○, this work; ◇, Stec et al; and □, Lichtfers …”

Section: Resultsmentioning

confidence: 89%

“…The hydrodynamic conditions within the CO 2 absorber are strongly influenced by the density and by the transport properties of the aqueous solution, , among which viscosity and CO 2 diffusivity have the greatest impact. Experimental data and models of density and viscosity of unloaded aqueous ammonia solutions have been reported in the literature. − Nevertheless, to our knowledge, there are no studies on the viscosity of aqueous (NH 3 + CO 2 ) solutions, and the amount of works dealing with the density of the tertiary CO 2 –NH 3 –H 2 O liquid mixture is very limited: Lichtfers performed measurements at temperatures above the typical operating conditions of the CO 2 absorption, that is, above 313 K, whereas Stec et al only carried out measurements at 293 K for aqueous solutions containing apparent concentrations of NH 3 up to 7 mol NH 3 kg H 2 O –1 . As far as the CO 2 diffusivity in the liquid is concerned, it can be computed as a function of the viscosity of the aqueous solution, which can be measured more easily…”

Section: Introductionmentioning

confidence: 99%

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Density and Viscosity of Aqueous (Ammonia + Carbon Dioxide) Solutions at Atmospheric Pressure and Temperatures between 278.15 and 318.15 K

et al. 2021

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The density and the viscosity of aqueous (NH 3 + CO 2 ) solutions have been measured at atmospheric pressure over a temperature range of 278 to 318 K and apparent concentrations of solute between 4 and 10 mol NH 3 kg H 2 O −1 for NH 3 and between 1 and 5.2 mol CO 2 kg H 2 O −1 for CO 2 . Solute loss from the aqueous solution associated with the high equilibrium partial pressure of NH 3 and of CO 2 has been limited by devices and protocols developed adhoc for sample preparation and density and viscosity measurement. Solid or vapor formation out of the initial liquid mixture has been avoided by means of a thermodynamic model-driven design of experiments. The experimental values gathered in this work have been used to obtain empirical models of density and viscosity, as a function of the apparent concentration of solutes, that is, NH 3 and CO 2 , and temperature, that are able to reproduce the experimental values in all cases with deviations below 1.1% for density and below 9.4% for viscosity. While it is the first time that, to our knowledge, experimental viscosity data of aqueous ammonia solutions loaded with CO 2 are added to the literature, the density model developed in this work is also able to reproduce experimental density data from literature with deviations below 1.5%, even outside the boundaries of the experimental conditions considered in this work.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Density and Viscosity of Aqueous (Ammonia + Carbon Dioxide) Solutions at Atmospheric Pressure and Temperatures between 278.15 and 318.15 K

et al. 2021

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“…Note that the pH value affects the packing density of surfactant molecules at the interface and therefore affects the intensity of the Marangoni flow. However, the variation of ammonia concentration in a rather wide range (e.g., from 2.3 to 8.2 wt %) corresponds to the quite negligible variation in the pH value (from 9.634 to 9.609) . Thus, the role of the pH change in the active motion of the droplets at the varying ammonia concentration is not so significant compared with the corresponding change in the rate of the reaction between copper and ammonia.…”

Section: Resultsmentioning

confidence: 93%

“…However, the variation of ammonia concentration in a rather wide range (e.g., from 2.3 to 8.2 wt %) corresponds to the quite negligible variation in the pH value (from 9.634 to 9.609). 41 Thus, the role of the pH change in the active motion of the droplets at the varying ammonia concentration is not so significant compared with the corresponding change in the rate of the reaction between copper and ammonia. Another possible method of regulating the velocity of droplet motion is the variation of the surfactant concentration in the solution.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Oscillating Motion of Oil Droplets in the Emulsion Near the Air–Water Interface

et al. 2021

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Numerous living organisms as well as artificially created self-propelled objects can form dissipative structures due to the nonlinear effects and nonequilibrium of the system. Here we present an active oil-in-water emulsion in which the oil droplets take part in the reciprocating motion under the action of Marangoni flow near the air−water interface. The droplet dynamics in the emulsion is governed by the chemical reaction proceeding between quiescent copper particles and ammonia and by the convective mixing of a surfactant. We established that the reciprocating motion of droplets in the emulsion arises as a result of a periodic change in the Marangoni flow direction at the air−water interface. The feature of the considered system is that the reciprocating motion of droplets is realized only when the surface area fraction of droplets in the emulsion is close to the density of a twodimensional colloid crystal. Oscillations degenerate under the reduction in surface area fraction to the critical value of ∼50% since the existence of oscillations in the emulsion requires a suppression of the surfactant convective mixing between the inner layers of liquid film and the air−water interface.

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Enhancement technologies of ammonia-based carbon capture: A review of developments and challenges

Sibhat,

Zhu,

Tsegay

et al. 2024

International Journal of Greenhouse Gas Control

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Simple method for determining CO2 loading of partially carbonated aqueous ammonia solutions using pH and density measurements

Cited by 5 publications

References 23 publications

Density and Viscosity of Aqueous (Ammonia + Carbon Dioxide) Solutions at Atmospheric Pressure and Temperatures between 278.15 and 318.15 K

Density and Viscosity of Aqueous (Ammonia + Carbon Dioxide) Solutions at Atmospheric Pressure and Temperatures between 278.15 and 318.15 K

Oscillating Motion of Oil Droplets in the Emulsion Near the Air–Water Interface

Enhancement technologies of ammonia-based carbon capture: A review of developments and challenges

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