Experimental investigation of neutralization dialysis in three-compartment membrane stack

Chérif, M.; Mkacher, I.; Ghalloussi, R.; Chaabane, L.; Salah, A. Ben; Walha, Khaled; Dammak, L.; Grande, Daniel

doi:10.1080/19443994.2014.968903

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…The developed model allowed simulating salt ions fluxes in the course of ND process in more favorable (for example, hydrodynamic) conditions than those applied in our laboratory experiments. As a rule, the diffusion layer thickness can be reduced with 1) the decrease in the distance between neighboring membranes, 2) the increase in solution flow velocity [34,36] and 3) the use of spacers with high capability of flow turbulization [26,33,46]. Let us consider one more DBL thickness (except that estimated for the experimental conditions), which was close to 50 µm.…”

Section: Resultsmentioning

confidence: 99%

“…The model predicted the oscillatory nature of the change in pH into the desalination compartment. A periodic increase and decrease in pH into the desalination compartment was experimentally confirmed in [33,34,38]. Models [36,37] were improved in [39], where a batch mode of the ND is considered.…”

Section: Introductionmentioning

confidence: 85%

“…It has been established that the efficiency of ND demineralization increases with a decrease in the intermembrane distance in the desalination compartment as well as with a decrease in the solution flow rate in the case of the direct-flow hydraulic mode [25]. If a batch hydraulic mode is used, on the contrary, it is necessary to increase the solution flow rate in order to reduce the diffusion boundary layer (DBL) thickness near the membrane surface [33,34]. The degree of extraction (or retention) of substances that enter the protolysis reactions depends on the values of the constants of these reactions and on the concentrations of acid and alkali [27,35] in the corresponding compartments of the ND stack.…”

Section: Introductionmentioning

confidence: 99%

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Neutralization Dialysis for Phenylalanine and Mineral Salt Separation. Simple Theory and Experiment

et al. 2019

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A simple non-steady state mathematical model is proposed for the process of purification of an amino acid solution from mineral salts by the method of neutralization dialysis (ND), carried out in a circulating hydrodynamic mode. The model takes into account the characteristics of membranes (thickness, exchange capacity and electric conductivity) and solution (concentration and components nature) as well as the solution flow rate in dialyzer compartments. In contrast to the known models, the new model considers a local change in the ion concentration in membranes and the adjacent diffusion layers. In addition, the model takes into consideration the ability of the amino acid to enter the protonation/deprotonation reactions. A comparison of the results of simulations with experimental data allows us to conclude that the model adequately describes the ND of a strong electrolyte (NaCl) and amino acid (phenylalanine) mixture solutions in the case where the diffusion ability of amino acids in membranes is much less, than mineral salts. An example shows the application of the model to predict the fluxes of salt ions through ion exchange membranes as well as pH of the desalination solution at a higher than in experiments flow rate of solutions in ND dialyzer compartments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Neutralization Dialysis for Phenylalanine and Mineral Salt Separation. Simple Theory and Experiment

et al. 2019

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“…A variety of synthesized polymer membranes are involved in membrane-separation processes, such as energy saving, resources recovery [1], and environmental preservation mainly for removal of metal or inorganic ions such as K + , Ca 2+ , Mg 2+ , NO 3 , and SO4 2 [2][3][4] and organic electrolytes [5][6][7][8] and for desalination [9][10][11][12]. Most of these membranes are highly crosslinked in order to increase their mechanical stability and avoid excessive water swelling.…”

Section: Introductionmentioning

confidence: 99%

Selective Separation of Organic Electrolytes by Neutralization Dialysis with Grafted Polyethylene Films

Kimura¹

2018

IJMSA

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The selective separation of organic electrolytes by neutralization dialysis was investigated with two kinds of grafted polyethylene (PE) films prepared through the photografting of 2-(dimethylamino) ethyl methacrylate (DMAEMA) onto the PE films and the subsequent quaternization and through the photografting of glycidyl methacrylate (GMA) and the subsequent sulfonation. The permeation flux of benzoic acid (BA) for the quarternized DMAEMA-grafted PE (PE-g-QPDMAEMA) films increased with an increase in the degree of quaternization, and the BA permeability had the maximum at the initial pH value of the permeate solution of 12.0. On the other hand, the sulfonation offered the phenylalaninol (Phl) permeability of the GMA-grafted PE (PE-g-PGMA) films. The selective separation for the binary BA/Phl or 2,5-dichlorobenzoic acid/Phl systems was successfully achieved by use of a pH difference between the feed and permeate solutions through the PEg -QPDMAEMA and sulfonated PEg -PGMA (PE-g-SPGMA) films. The maximum selective separation was obtained under the conditions that the initial pH values of the permeate solutions through the PEg -QPDMAEMA and PEg -SPGMA films were adjusted to 12.0 and 2.0, respectively. This procedure will be applied to separation and concentration of organic electrolytes and water purification.

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“…To exploit the energy stored in waste acid and alkaline solutions, previous work has been done by using a pseudocapacitor, where redox reactions happen on the electrodes. , However, assembling of these electrode materials is not easy . To harvest electricity using a simple procedure, we developed a novel technology known as capacitive neutralization dialysis energy (CNDE), which is based on classical neutralization dialysis (ND). − The ND cell, a self-powered desalination device using both acidic and basic streams, is based on a simple three-compartment configuration consisting of one cation-exchange membrane (CEM) and one anion-exchange membrane (AEM) separating acid, salt water, and alkaline compartments. ,, The desalination process is purely driven by the ionic gradients between each ion-exchange membrane.…”

Section: Introductionmentioning

confidence: 99%

Capacitive Neutralization Dialysis for Direct Energy Generation

Liu

Zhang

Ou‐Yang

et al. 2017

Environ. Sci. Technol.

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Capacitive neutralization dialysis energy (CNDE) is proposed as a novel energy-harvesting technique that is able to utilize waste acid and alkaline solutions to produce electrical energy. CNDE is a modification based on neutralization dialysis. It was found that a higher NaCl concentration led to a higher open-circuit potential when the concentrations of acid and alkaline solutions were fixed. Upon closing of the circuit, the membrane potential was used as a driving force to move counter ions into the electrical double layers at the electrode-liquid interface, thereby creating an ionic current. Correspondingly, in the external circuit, electrons flow through an external resistor from one electrode to the other, thereby generating electrical energy directly. The influence of external resistances was studied to achieve greater energy extraction, with the maximum output of 110 mW/m obtained by employing an external resistance of 5 Ω together with the AC-coated electrode.

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Experimental investigation of neutralization dialysis in three-compartment membrane stack

Cited by 10 publications

References 18 publications

Neutralization Dialysis for Phenylalanine and Mineral Salt Separation. Simple Theory and Experiment

Neutralization Dialysis for Phenylalanine and Mineral Salt Separation. Simple Theory and Experiment

Selective Separation of Organic Electrolytes by Neutralization Dialysis with Grafted Polyethylene Films

Capacitive Neutralization Dialysis for Direct Energy Generation

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