Mass transfer characteristics of CO2 absorption into 1-butyl-3-methylimidazolium tetrafluoroborate aqueous solution in microchannel

Chu, Chunyan; Zhang, Fanbin; Zhu, Chunying; Fu, Taotao; Ma, Youguang

doi:10.1016/j.ijheatmasstransfer.2018.09.077

Cited by 43 publications

(23 citation statements)

References 40 publications

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“…Over the past few decades, a rapid progress has been achieved in the development of gas–liquid two‐phase flow, especially the slug flow, for its numerous and diverse applications in the chemical reaction, 1–3 gas absorption, 4–6 heat transfer, 7,8 crystallization, 9,10 and so on. Importantly, the gas–liquid slug flow in microdevices greatly promotes the mass transfer efficiency owing to the large specific surface area and circulation flow inside slugs, which has attracted considerable attention in recent years 11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…The reported configurations for microfluidic T‐junction devices can be generally classified into three types: conventional T‐junction, 19,20 capillary embedded T‐junction, 21,22 and capillary embedded step T‐junction, 23,24 as depicted in Figure 1. There is no denying that the mass transfer in the microchannel has been significantly enhanced when compared with the conventional equipment 5,25,26 . However, the mass transfer performance in the microchannel can still be further improved.…”

Section: Introductionmentioning

confidence: 99%

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High‐frequency formation of bubble with short length in a capillary embedded step T‐junction microdevice

et al. 2021

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The performances of slug flow gas–liquid reactors are mostly determined by slug length, especially for the high gas–liquid flow rate ratio condition. This work is the first time to report the short bubble generated with high frequency in a capillary embedded step T‐junction microdevice. The aspect ratio of bubble could be around 0.5 with a frequency higher than 750 s−1 when the gas–liquid flow rate ratio is even higher than 5. The specific surface area of the generated gas–liquid microdispersion system is larger than 10,400 m2/m3. The short bubble formation process includes two periods, and its formation mechanism is mainly because of the relatively higher pressure drop in the step T‐junction, which provides a much higher breakup force for the squeezing flow. Finally, two models are developed to predict the bubble frequency and volume. This work provides a highly promising dispersion technology for the gas–liquid process intensification in microreactors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐frequency formation of bubble with short length in a capillary embedded step T‐junction microdevice

et al. 2021

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“…However, some of the ILs (e.g., [P 4442 ][Cy-Suc], 2567 mPa•s at 303.15 K) [8] and DESs (e.g., [MTPP][Br]-GLY 1:4, 1658 mPa•s at 298.15 K) [9] have high viscosities that influence the rate of absorptions, inhibiting their industry applications. To cope with this disadvantage, hybrid ILs or DESs with water have been strongly recommended [9][10][11][12][13][14]. For example, Zhang et (90 wt %) + H 2 O (10 wt %)) [13].…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquids/Deep Eutectic Solvents-Based Hybrid Solvents for CO2 Capture

Liu

Dai

et al. 2020

Crystals

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The CO2 solubilities (including CO2 Henry’s constants) and viscosities in ionic liquids (ILs)/deep eutectic solvents (DESs)-based hybrid solvents were comprehensively collected and summarized. The literature survey results of CO2 solubility illustrated that the addition of hybrid solvents to ILs/DESs can significantly enhance the CO2 solubility, and some of the ILs-based hybrid solvents are super to DESs-based hybrid solvents. The best hybrid solvents of IL–H2O, IL–organic, IL–amine, DES–H2O, and DES–organic are [DMAPAH][Formate] (2.5:1) + H2O (20 wt %) (4.61 mol/kg, 298 K, 0.1 MPa), [P4444][Pro] + PEG400 (70 wt %) (1.61 mol/kg, 333.15 K, 1.68 MPa), [DMAPAH][Formate] (2.0:1) + MEA (30 wt %) (6.24 mol/kg, 298 K, 0.1 MPa), [TEMA][Cl]-GLY-H2O 1:2:0.11 (0.66 mol/kg, 298 K, 1.74 MPa), and [Ch][Cl]-MEA 1:2 + DBN 1:1 (5.11 mol/kg, 298 K, 0.1 MPa), respectively. All of these best candidates show higher CO2 solubility than their used pure ILs or DESs, evidencing that IL/DES-based hybrid solvents are remarkable for CO2 capture. For the summarized viscosity results, the presence of hybrid solvents in ILs and DESs can decrease their viscosities. The lowest viscosities acquired in this work for IL–H2O, IL–amine, DES–H2O, and DES–organic hybrid solvents are [DEA][Bu] + H2O (98.78 mol%) (0.59 mPa·s, 343.15 K), [BMIM][BF4] + DETA (94.9 mol%) (2.68 mPa·s, 333.15 K), [L-Arg]-GLY 1:6 + H2O (60 wt %) (2.7 mPa·s, 353.15 K), and [MTPP][Br]-LEV-Ac 1:3:0.03 (16.16 mPa·s, 333.15 K) at 0.1 MPa, respectively.

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“…The range of obtained k l a values in a straight reference channel is small and values are in the known range of Taylor and bubbly flow in microchannels as shown in Table 1. The volumetric mass transfer coefficients obtained with the nozzles are in the upper range for micro reactors [12,35,36].…”

Section: Introductionmentioning

confidence: 94%

Gas-liquid mass transfer intensification for bubble generation and breakup in micronozzles

et al. 2021

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The local gas-liquid mass transfer was characterized during bubble generation in T-contactors and in an adjacent micronozzle. A colorimetric technique with the oxygen sensitive dye resazurin was investigated to visualize gas-liquid mass transfer during slug flow, bubble deformation, as well as laminar and turbulent bubble breakup in the wake of a micronozzle. Two optimized nozzle geometries from previous studies were evaluated concerning volumetric mass transfer coefficients for low pressure loss, narrow residence time distribution, or high dispersion rates. Highest values in kla up to 60 s−1 were found for turbulent bubble breakup and an optimized micronozzle design in respect to pressure drop and dispersion rate. The achieved mass transfer coefficients were correlated with the energy dissipation rate within the micronozzles and with the inverse Kolmogorov time scale in vortex dissipation in good agreement for laminar and turbulent breakup regimes. Graphical abstract

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Mass transfer characteristics of CO2 absorption into 1-butyl-3-methylimidazolium tetrafluoroborate aqueous solution in microchannel

Cited by 43 publications

References 40 publications

High‐frequency formation of bubble with short length in a capillary embedded step T‐junction microdevice

High‐frequency formation of bubble with short length in a capillary embedded step T‐junction microdevice

Ionic Liquids/Deep Eutectic Solvents-Based Hybrid Solvents for CO2 Capture

Gas-liquid mass transfer intensification for bubble generation and breakup in micronozzles

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