Continuous ion-exchange membrane electrodialysis of mother liquid discharged from a salt-manufacturing plant and transport of Cl-ions and SO42-ions

Tanaka, Yoshinobu; Uchino, Hazime; Murakami, Masayoshi

doi:10.12989/mwt.2012.3.1.063

Cited by 12 publications

(4 citation statements)

References 23 publications

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“…The greater the flow rate, the thinner film layer adjacent the membrane. A thin film layer makes mass transfer resistance smaller, thus the number of separated ion increases [22]. In accordance with the following explanation, it can be estimated that the increases in the flow rate of 10 L/h to 15 L/h in the lithium separation process can reduce the thickness of the film, so that the rate of lithium's transfer process was faster, and the number of separated ions increased.…”

Section: The Influence Of Flow Ratesupporting

confidence: 61%

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Separation of Lithium Ion from Lithium-Cobalt Mixture using Electrodialysis Monovalent Membrane

Ariyanto¹,

Supranto²,

Prasetyo³

2018

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Electrodialysis is a separation process which ions are transported through semi permeable membranes under an influence of electric potential. In this research, electrodialysis using monovalent ion exchange membranes was applied to separate lithium ions from mixtures of lithium-cobalt aqueous solution. The study aims to examine factors that affect the performances of electrodialysis monovalent membrane, such as applied voltage, flow rate, and the concentration of cobalt as co-ion. The research was conducted using electrodialysis PC cell BED 64004, monovalent cation exchange membrane (PC-MVK) and monovalent anion exchange membrane (PC-MVA) produced by PCA-PolymerchemicAltmeier, GmbH, Heusweiler, Germany. The effect of applied voltage was studied by varying the voltage in the range of 1-4 volt/cell volt. The effects of flow rate and initial concentration of ion were studied by changing the flow rate (10, 15, and 20 L/h) and varying the ratio of initial concentration between Li and Co ions (100-100, 100-400, and 100-500 mg/L). The results exhibited that the highest separation capacity of lithium (99.40%) was obtained when using the optimum applied voltage of 1 volt/cell. Low energy consumption would be obtained when using a low voltage for the process separation. The optimum flow rate for the lithium separation using electrodialysis monovalent membrane in this research was 15 L/h. The greater flow rate reduced the current efficiency and increased the energy consumption. When the concentrations of cobalt were increased in the range of 100-500 mg/L, the results indicated a decrease of current efficiency but an increase of energy consumption showing the influence of concentration of cobalt to transportation of lithium ions and selectivity of monovalent membrane.

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Section: The Influence Of Flow Ratesupporting

confidence: 61%

“…electrical resistance of the membrane [21]. In electrochemical processes, electrical resistance will affect the energy consumption, so that the ion exchange membranes with low electrical resistance are desirable [22].…”

Section: Membrane Characterizationsmentioning

confidence: 99%

Separation of Lithium Ion from Lithium-Cobalt Mixture using Electrodialysis Monovalent Membrane

Ariyanto¹,

Supranto²,

Prasetyo³

2018

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“…Ion transport across an ion-selective interface, such as a nanochannel, an electrode, or an ion-selective membrane, has found numerous applications in, e.g., dialysis, desalination, battery and fuel cell technology, electrochemistry, and microfluidic systems [1][2][3][4][5][6][7]. A common feature of ion transport across ion-selective interfaces is the phenomenon known as concentration polarization, in which the ion concentration undergoes depletion next to the interface leading to a decrease in conductivity [1].…”

Section: Introductionmentioning

confidence: 99%

Transport-limited water splitting at ion-selective interfaces during concentration polarization

Nielsen

Bruus

2014

Phys. Rev. E

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We present an analytical model of salt-and water-ion transport across an ion-selective interface based on an assumption of local equilibrium of the water-dissociation reaction. The model yields current-voltage characteristics and curves of water-ion current versus salt-ion current, which are in qualitative agreement with experimental results published in the literature. The analytical results are furthermore in agreement with direct numerical simulations. As part of the analysis, we find approximate solutions to the classical problem of pure salt transport across an ion-selective interface. These solutions provide closed-form expressions for the current-voltage characteristics, which include the overlimiting current due to the development of an extended space-charge region. Finally, we discuss how the addition of an acid or a base affects the transport properties of the system and thus provide predictions accessible to further experimental tests of the model.

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“…With m = 66.36 + 14.72*u and n = 0.7404 + 3.585*10 -3 *u In his investigation, Tanaka used NaCl solutions and an electrodialysis unit incorporated with an Aciplex A172 anion-exchange membrane (Tanaka 2005b, 2006, Tanaka et al 2012.…”

Section: Model Fittingmentioning

confidence: 99%

Development of a predictive model of the limiting current density of an electrodialysis process using response surface methodology

Ali¹,

Hamrouni²

2016

Membr. Water Treat.

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Electrodialysis (ED) is known to be a useful membrane process for desalination, concentration, separation, and purification in many fields. In this process, it is desirable to work at high current density in order to achieve fast desalination with the lowest possible effective membrane area. In practice, however, operating currents are restricted by the occurrence of concentration polarization phenomena. Many studies showed the occurrence of a limiting current density (LCD). The limiting current density in the electrodialysis process is an important parameter which determines the electrical resistance and the current utilization. Therefore, its reliable determination is required for designing an efficient electrodialysis plant. The purpose of this study is the development of a predictive model of the limiting current density in an electrodialysis process using response surface methodology (RSM). A two-factor central composite design (CCD) of RSM was used to analyze the effect of operation conditions (the initial salt concentration (C) and the linear flow velocity of solution to be treated (u)) on the limiting current density and to establish a regression model. All experiments were carried out on synthetic brackish water solutions using a laboratory scale electrodialysis cell. The limiting current density for each experiment was determined using the Cowan-Brown method. A suitable regression model for predicting LCD within the ranges of variables used was developed based on experimental results. The proposed mathematical quadratic model was simple. Its quality was evaluated by regression analysis and by the Analysis Of Variance, popularly known as the ANOVA.

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Continuous ion-exchange membrane electrodialysis of mother liquid discharged from a salt-manufacturing plant and transport of Cl^-ions and SO₄^2-ions

Cited by 12 publications

References 23 publications

Separation of Lithium Ion from Lithium-Cobalt Mixture using Electrodialysis Monovalent Membrane

Separation of Lithium Ion from Lithium-Cobalt Mixture using Electrodialysis Monovalent Membrane

Transport-limited water splitting at ion-selective interfaces during concentration polarization

Development of a predictive model of the limiting current density of an electrodialysis process using response surface methodology

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