Chunfei Wu

Chunfei Wu

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CO2 absorption - solvent - Amine-based - Methodologies - absorption, solvent properties testing - Characterisation of solvent properties (e.g. degradation)

Density measurement of MEA and water mixtures

https://doi.org/10.1155/2020/7051368

“Table 1 summarizes the performed studies on density measurements of pure MEA under different temperatures in which most of the previous density measurements were limited to the temperature range of 293.15 to 353.15 K [2, 4–24]. DiGuilio et al. [9] studied densities of various ethanolamines and MEA in the temperature range of 294.4 to 431.3 K. There is a lack of information about densities of MEA at high pressures. Sobrino et al. [25] were able to measure densities of aqueous MEA mixtures at both high temperatures and pressures. The study was performed within the temperature range of 293.15 to 393.15 K and the pressure range from 0.1 MPa to 120 MPa. The density of aqueous MEA has been measured extensively under a wide range of MEA concentrations as shown in Table 2. The data are highly valuable because of their usability in the calculation of other important physiochemical parameters in the process. In the process, the absorption column operates with CO2-loaded aqueous MEA solution. Typical operating conditions for the absorption process with CO2 loading are from generally 0.2 to 0.5 mol CO2/mol MEA [30]. The studies performed on density measurement of CO2-loaded aqueous MEA are listed in Table 3. Several challenges were noticed in density measurement of aqueous MEA and CO2-loaded aqueous MEA solutions. There is a high probability to evaporate MEA from the mixtures at high temperatures. Further, a desorption of CO2 is also present in CO2-loaded aqueous mixtures at high temperatures and high CO2 loadings. Accordingly, care must be given to minimize occurrence of such phenomena through visual observations to get accurate density measurements. CO2 or MEA evaporation is observed as bubble formation inside the U-tube in oscillating density meters, which leads to an error in density measurement.”

Table 1 Previous measurements of density of pure MEA.
Source T (K) No of points Method
Low High
Touhara et al. [5] 298.15 1 Pycnometer
Yang et al. [6] 293.15 343.15 6 Anton Paar (DMA 5000M)
Li and Shen [7] 303.15 353.15 8 Pycnometer
Wang et al. [8] 293.45 360.65 5 Pycnometer
DiGuilio et al. [9] 294.4 431.3 8 Pycnometer
Page et al. [10] 283.15 313.15 3 Flow densimeter
Maham et al. [11] 298.15 353.15 5 Anton Paar (DMA 45)
Guevara and Rodriguez [12] 298.15 333.15 8 Sodev 03D vibrating densimeter
Li and Lie [13] 303.15 353.15 6 Pycnometer
Lee and Lin [14] 303.15 323.15 3 Pycnometer
Song et al. [15] 303.15 343.15 5 Pycnometer
Kapadi et al. [16] 303.15 318.15 4 Anton Paar (DMA 5000)
Islam et al. [17] 293.15 1 Pycnometer
Valtz et al. [18] 281.15 353.15 37 Anton Paar (DMA 5000)
Geng et al. [19] 288.15 323.15 8 Pycnometer
Pouryousefi and Idem [20] 295.15 333.15 4 Anton Paar (DMA 4500/DMA 5000)
Amundsen et al. [2] 298.15 353.15 5 Anton Paar (DMA 4500)
Taib and Murugesan [21] 303.15 353.15 6 Anton Paar (DMA 5000)
Taib and Murugesan [22] 293.15 353.15 16 Anton Paar (DMA 5000M)
Han et al. [4] 298.15 423.15 20 Anton Paar (DMA 4500/DMA HP)
Abuin et al. [23] 298.15 1 Anton Paar (DSA 5000)
Yang et al. [6] 293.15 343.15 6 Anton Paar (DMA 5000M)
Xu et al. [24] 293.15 333.15 5 Anton Paar (DMA 5000)
Ma et al. [27] 293.15 333.15 5 Anton Paar (DMA 4500M)

Table 2 Sources of reported density measurements of aqueous MEA.
Source Concentration: MEA () T (K) No of points Method
Low High Low High
Weiland et al. [26] 0.0317 0.1643 298.15 4 Hydrometer
Amundsen et al. [2] 0.0687 0.7264 298.15 353.15 30 Anton Paar (DMA 4500)
Han et al. [4] 0.1122 0.7264 298.15 423.15 140 Anton Paar (DMA4500/DMA HP)
Hartono et al. [1] 0.0191 0.1122 293.15 353.15 15 Anton Paar (DMA 4500M)
Page et al. [10] 0.00118 0.99695 283.15 313.15 62 Flow densimeter
Maham et al. [11] 0.0054 0.9660 298.15 353.15 100 Anton Paar (DMA 45)
Lee and Lin [14] 0.1000 0.9000 303.15 323.15 27 Pycnometer
Kapadi et al. [16] 0.1122 0.8486 303.15 383.15 32 Anton Paar (DMA 5000)
Pouryousefi and Idem [20] 0.0155 0.9192 295.15 333.15 80 Anton Paar (DMA 4500/DMA 5000)
Ma et al. [27] 0.1000 0.8995 293.15 333.15 45 Anton Paar (DMA 4500M)
Mandal et al. [28] 0.1122 293.15 323.15 7 Pycnometer
Li and Lie [13] 0.0687 303.15 353.15 6 Pycnometer
Zhang et al. [29] 0.1122 298.15 353.15 9 Anton Paar (DMA 5000M)

Table 3 Sources of reported density measurements of CO2-loaded aqueous MEA.
Source Concentration: mass% MEA in (MEA + water) solutions CO2 loading:  (mol CO2/mol MEA) T (K) No. of points Method
Low High Low High
Weiland et al. [26] 10 40 0.05 0.5 298.15 40 Hydrometer
Amundsen et al. [2] 20 40 0.1 0.5 298.15–353.15 68 Anton Paar (DMA 4500)
Han et al. [4] 30 60 0.1 0.56 298.15–423.15 240 Anton Paar (DMA 4500/DMA HP)
Jayarathna et al. [31] 20 70 0.1 0.5 303.15–333.15 144 Anton Paar (DMA 4500M)
Jayarathna et al. [3] 80 0.07 0.51 313.15–343.15 64 Anton Paar (DMA 4500M)
Hartono et al. [1] 6.2 30 0.1 0.5 293.15–353.15 68 Anton Paar (DMA 4500M)
Zhang et al. [29] 30 0.14 0.49 298.15–353.15 33 Anton Paar (DMA 5000M)

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