Near critical and supercritical fluid extraction of Cu(II) from aqueous solutions using a hollow fiber contactor

Valdés, Hugo; Sepúlveda, Rossana; Romero, Julio; Valenzuela, Fernando; Sánchez, J.

doi:10.1016/j.cep.2012.12.005

Cited by 15 publications

(21 citation statements)

References 24 publications

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“…The methodology is outlined in Figure 3. In the initial stage, the experiments performed by Valdés and collaborators [19] were analyzed as these experiments considered the passage of the SC-CO 2 through the shell of the HFMC. Then, the following problem was established: There is uncertainty regarding the fluid dynamic behavior of the SC-CO 2 inside the HFMC.…”

Section: Methodsmentioning

confidence: 99%

“…The membrane contactors used in the Porocrit process are of the hollow fiber type. Several studies have considered the use of SC-CO 2 in hollow fiber membrane contactors (HFMCs) [19,[34][35][36][37][38][39][40][41][42]. There are two important issues for the Porocrit process: The mass transfer (MT) and fluid dynamics (FD) inside the membrane module.…”

Section: Supercritical Co 2 In a Membrane Contactormentioning

confidence: 99%

“…In the research on the MT in HFMCs, the following is assumed: A steady-state system; equilibrium is reached at the fluid-fluid interface; the phases present in the shell and tubes are perfectly mixed; there is a developed laminar flow; the pore size is uniform in the whole membrane; the curvature of the interface does not have a significant effect on the mass transfer or solute distribution; the membrane is "humidified" homogeneously; the mass transfer is correctly described with the boundary layer model; MT does not occur in the non-porous zone of the membrane; the fluids are immiscible; and the coefficient of the partition of the solute is constant [43][44][45][46][47][48][49][50]. On the other hand, there are authors that have studied the MT in HFMCs that have used SC-CO 2 as a solvent [1,19,43,[51][52][53].…”

Section: Supercritical Co 2 In a Membrane Contactormentioning

confidence: 99%

“…The main compound used under critical and supercritical conditions is CO 2 . Until 2018, 27,233 journals on SC-CO 2 applications had been published on the ScienceDirect website [19][20][21][22][23][24][25][26][27][28]. The broad use of SC-CO 2 is due to the fact that it is inexpensive, chemically inert, non-toxic, and non-flammable, has a relatively low critical point (P C = 7.38 MPa, T C = 304.15 K), and is considered by the Food and Drug Administration (FDA) as being a GRAS (Generally Recognized as Safe) product [29].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation on Supercritical CO2 Fluid Dynamics in a Hollow Fiber Membrane Contactor

2019

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This research answers the following question: What is the fluid dynamic behavior of a supercritical fluid (SCF) inside a membrane module? At this time, there is very little or no reported information that can provide an answer to this question. The research studies related to the themes of supercritical CO2 (SC-CO2), hollow fiber membrane contactors (HFMCs), and numerical simulations have mainly reported on 2D simulations, but in this work, 3D profiles are presented. Simulations were performed based on the experimental results and other simulations, using the geometry of a commercial module. The results were mainly based on the different operating conditions and geometric dimensions. A mesh study was performed to ensure the mesh non-dependence of the results presented here. It was observed that the velocity profile developed at 10 mm from the wall of the supercritical CO2 entrance pipe. A profile equilibrium around the fiber close to the entrance of the module was achieved in the experimental hollow fiber membrane contactor when compared to the case of the commercial hollow fiber membrane contactor. The results of this research provided a visualization of the boundary layer, which did not cover the entire fiber length. Finally, the results of this paper are interesting for technical applications and contribute to our understanding of the hydrodynamics of SCFs.

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Section: Methodsmentioning

confidence: 99%

Section: Supercritical Co 2 In a Membrane Contactormentioning

confidence: 99%

Section: Supercritical Co 2 In a Membrane Contactormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation on Supercritical CO2 Fluid Dynamics in a Hollow Fiber Membrane Contactor

2019

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“…LIX reagents have also been used to study the extraction equilibria for the extraction of nickel, cobalt, zinc, cadmium and copper (14,(24)(25)(26). On the other hand 1,1,1-trifluoro-2,4-pentanedione or commonly known as trifluoro-acetylacetone (TFA) has only been used for near and/or supercritical extraction of copper (27)(28)(29)(30). Nonetheless TFA has been found to be a good alternative extractant for liquid-liquid solvent extraction (31) and its extraction kinetics should further be investigated and compared with oxime extractants.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Distribution Equilibria and Kinetics of Copper(II) Extraction with LIX 84 I and TFA

Younas

Druon‐Bocquet

Romero

et al. 2015

Separation Science and Technology

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Batch experiments of copper(II) extraction at equilibrium were carried out in a temperature controlled stirred cell to extract copper(II) with LIX 84-I and 1,1,1-trifluoro-2,4-pentanedione (TFA) diluted in either n-heptane, tetradecane, MIBK or n-decanol at 298 and 313 K. Extraction efficiency and capacity of copper(II) extraction with acid extractants at equilibrium were measured and analysed using a theoretical model based on equilibrium extraction kinetics.Experimental and theoretical investigations revealed that TFA and n-decanol are found to be an efficient extractant and diluent, respectively, for copper(II) extraction with high values of extraction capacity.

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Copper removal from aqueous solutions by means of ionic liquids containing a β‐diketone and the recovery of metal complexes by supercritical fluid extraction

Sepúlveda

Romero

Sánchez

2014

J of Chemical Tech & Biotech

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BACKGROUND: This work is focused on the removal of Cu(II) ions from aqueous solutions by means of different hydrophobic imidazolium-based ionic liquids containing 1,1,1-trifluoro-2,4-pentanedione (TFA) as extractant and the subsequent extraction of the metal complexes formed in the IL by means of supercritical fluid extraction. RESULTS: Solutions containing between 250 and 500 mg L -1 of Cu(II) ions were contacted with [bmim][PF 6 ], [hmim][PF 6 ] and [bmim][Tf2 N] containing TFA. After liquid-liquid extraction, both phases were analysed, verifying the formation of neutral complex Cu(TFA) 2 as the predominant extraction mechanism in [bmim][PF 6 ] and [bmim][Tf 2 N]. Meanwhile, the extraction of Cu(II) in [bmim][PF 6 ] was strongly influenced by the direct interaction between the metal ion and the IL. ILs used in L-L extractions were regenerated using supercritical CO 2 at 18 MPa and 40 ∘ C. [bmim][Tf 2 N] showed the highest accumulative extraction percentage (≈ 80%) after sequential loads of Cu(II) ions. CONCLUSION: From these tests, [bmim][Tf 2 N] was the solvent that showed the best performance in terms of accumulative extraction and recycling capacity in sequential extraction cycles mediated by regeneration with supercritical CO 2 . This study demonstrates that this process could be considered an alternative separation technique for metal ions using green solvents, and with extractant requirements lower than in conventional solvent extraction operations.

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Near critical and supercritical fluid extraction of Cu(II) from aqueous solutions using a hollow fiber contactor

Cited by 15 publications

References 24 publications

Numerical Simulation on Supercritical CO2 Fluid Dynamics in a Hollow Fiber Membrane Contactor

Numerical Simulation on Supercritical CO2 Fluid Dynamics in a Hollow Fiber Membrane Contactor

Experimental and Theoretical Investigation of Distribution Equilibria and Kinetics of Copper(II) Extraction with LIX 84 I and TFA

Copper removal from aqueous solutions by means of ionic liquids containing a β‐diketone and the recovery of metal complexes by supercritical fluid extraction

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