Intensified extraction of uranium(VI) in impinging-jets contactors

Tsaoulidis, Dimitrios; Ortega, Eduardo Garciadiego; Angeli, Panagiota

doi:10.1016/j.cej.2018.02.049

Cited by 23 publications

(9 citation statements)

References 51 publications

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“…5 over the whole channel length from the initial contact time of the two phases in the T-junction (t=0) to t=τ, the residence time in the reactor, the mass transfer coefficient can be found from Eq. 5 as follows [35]:…”

Section: Mass Transfer Coefficientmentioning

confidence: 99%

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Angeli

Tsaoulidis

Weheliye

2019

Chemical Engineering Journal

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The mass transfer of europium(III) from an aqueous to an organic phase was studied in a quartz microchannel (internal diameter of 200 μm) using a novel micro Laser Induced Fluorescence (micro-LIF) technique. Europium(III) was extracted from a 1M nitric acid solution into an organic solution of TBP(1.2M)/CMPO(0.2M) in Exxsol D80. For the flow rates investigated plug flow was established. An experimental and data processing methodology was developed to calculate concentration profiles from the fluorescing light intensity profiles in both phases at different locations along the microchannel. In particular, the effect that the high light intensity of the organic phase has on the measurements in the aqueous phase was taken into account. Mass transfer was found to be significant in the beginning of the channel close to the inlet (1 mm distance) with extraction percentages varying between 20 to 40% depending on the total flow rate. High extraction efficiency (~80%) was achieved at short residence times (in the first 6 s), while the overall volumetric mass transfer coefficients varied between 0.05 and 3.3 s-1 .

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Section: Mass Transfer Coefficientmentioning

confidence: 99%

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Angeli

Tsaoulidis

Weheliye

2019

Chemical Engineering Journal

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“…An alternative option for increasing throughput is the confined impinging-jets (CIJ) inlet configuration [ 21 , 22 ]. In this case, the two immiscible liquids are brought into contact in the inlet at high velocities, increasing significantly the energy dissipation rates at this region [ 23 ]. With this configuration, dispersed flow is formed, which exhibits very large specific interfacial areas available for mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Scale-Up Studies for Co/Ni Separations in Intensified Reactors

Tsaoulidis

Mamtora²,

Gañet³

et al. 2020

Micromachines

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In this paper, the effect of the scalability of small-scale devices on the separation of Co(II) from a binary Co(II)/Ni(II) mixture in a nitric acid solution by an organic Cyanex 272/TBP/kerosene (Exxsol D80) phase is studied. In particular, circular channels with diameters of 1, 2, and 3.2 mm are considered. The results were compared against those from a confined impinging-jets (CIJ) cell with a main channel diameter of 3.2 mm. The effects of total flowrate, residence time, Cyanex 272 concentration, and flowrate ratio on the mass transfer performance were investigated. It was found that at increased channel size, the throughputs were also increased but the extraction percentages remained the same. Higher extraction percentages were obtained by using the CIJ configuration at short residence times. However, for longer residence times, the mass transfer coefficients were similar and capillary channels should be preferred over the CIJ because of the ease of separation of the two phases at the end of the unit. The overall mass transfer coefficients ranged between 0.02 and 0.14 s−1 for the capillary channels during plug flow and between 0.05 and 0.45 s−1 for the CIJ cells during dispersed flow.

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“…The stagnation flows formed by opposed impinging jets have been widely applied in industrial processes, including combustion, gasification, mixing, extraction, and nanoparticle synthesis . In recent decades, much attention has been devoted to the flow instability in opposed impinging jets .…”

Section: Introductionmentioning

confidence: 99%

Trapping region of impinging jets in a cross‐shaped channel

Zhang

Yao²,

et al. 2019

AIChE Journal

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This study follows our previous report (Zhang et al., Phys. Fluids, vol. 31, 2019, 034105) by describing the formation and evolution of the engulfment flow in the cross-shaped channel. First, the flow regimes were studied by planar laser induced fluorescence (PLIF). Results show the formation of a spiral vortex in the center of the chamber and the appearance of a well-mixed zone inside the spiral vortex. Second, we proposed a novel experimental method to analyze the residence time of the fluid in the chamber, and discover an unexpected trapping region inside the well-mixed zone. There is almost no fluid transport into or out of this region. Furthermore, three-dimensional numerical simulation is used to reveal the origination of this trapping region. Simulation results reveal that the fluid recirculates in the trapping region and the flow feature is caused by the bubble-type vortex breakdown.

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Intensified extraction of uranium(VI) in impinging-jets contactors

Cited by 23 publications

References 51 publications

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Scale-Up Studies for Co/Ni Separations in Intensified Reactors

Trapping region of impinging jets in a cross‐shaped channel

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