https://doi.org/10.1155/2020/7051368
“Viscosity measurements of MEA and water mixtures are equally important as density measurements in the postcombustion absorption process. Viscosity has a high impact on the mass transfer coefficient of gas into a liquid in a packed bed absorber [32]. The viscosity of MEA varies with the amount of water and CO2 present in the solution and decreases as the solution temperature increases. The available literature for the viscosity measurements of pure MEA is shown in Table 4 [2, 9, 13–17, 19, 23, 24, 28, 33]. Previous studies have attempted to cover the viscosity data in the range of 0–100 mass% MEA [14, 17, 33]. Measurements at a temperature above 373.15 K are reported in [33, 36]. For CO2-loaded aqueous MEA, most of the reported studies presented the viscosity of 30 mass% MEA solutions within the CO2-loading range of 0–0.5 mol CO2/mol MEA. Idris et al. [34] discussed the viscosity measurements at higher (>50 mass%) MEA concentrations. The study performed by Arachchige et al. [37] presented data at higher temperatures (>373.15 K). Tables 5 and 6 list studies performed on viscosity measurements of aqueous MEA and CO2-loaded aqueous MEA, respectively. The evaporation and desorption of MEA and CO2 from aqueous MEA and CO2-loaded aqueous MEA solutions cause errors in the viscosity measurements. Idris et al. [34] adopted a method to suppress the CO2-loaded aqueous MEA mixture using N2 gas with 4 bar pressure to avoid the escape of CO2 from the system. Further, Idris et al. [34] claim that the applied pressure would not influence the outcome of the experiments.”
Table 4 Sources of reported viscosity measurements of pure MEA.
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Table 5 Sources of reported viscosity measurements of aqueous MEA.
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Table 6 Sources of reported viscosity measurements of CO2-loaded aqueous MEA.
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