Electrodialysis concentration of sulfuric acid

Loza, S. A.; Smyshlyaev, N. A.; Korzhov, A. N.; Romanyuk, N. A.

doi:10.15826/chimtech.2021.8.1.06

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…Based on the data obtained, the average energy consumption for the concentration of sulfuric acid was calculated, which amounted to 162 W•h/mol, which is comparable or somewhat lower than the results available in other works. Thus, it was shown in [28], [29] that for solutions comparable in composition, the energy consumption is 219-430 W•h/mol. It turned out that the current efficiency for sulfuric acid does not exceed 16%.…”

Section: Acid Recovery From Wastewater Of the Coated Steel Wire Produ...mentioning

confidence: 99%

Hybrid Membrane Technology for Acids Recovery from Wastewater of the Coated Steel Wire Production: A Pilot Scale Study

Loza¹,

Loza²,

Korzhov³

et al. 2022

Preprint

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In the present study, the problem of the sulfuric acid recycling from spent copper plating solution was solved using a hybrid membrane technology, including diffusion dialysis and electrodialysis. A real solution from the production of copper-coated steel wire, containing 1.45 mol/L of sulfuric acid, 0.67 mol/L of ferrous sulfate and 0.176 mol/L of copper sulfate was processed. Diffusion dialysis with anion-exchange membranes was used to separate sulfuric acid and salts of heavy metals. Then purified dilute sulfuric acid was concentrated by electrodialysis. Energy consumption for sulfuric acid electrodialysis concentration at a current density of 400 A/m2 was 162 W·h/mol with current efficiency 16 %. After processing according to the hybrid membrane scheme, the solution contained 1.13 mol/L sulfuric acid, 0.077 mol/L ferrous sulfate and 0.022 mol/L copper sulfate. The resulting acid solution with a small amount of ferrous sulfate and copper sulfate met the established requirements for a copper plating bath solution and can be reused in production.

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Section: Acid Recovery From Wastewater Of the Coated Steel Wire Produ...mentioning

confidence: 99%

Hybrid Membrane Technology for Acids Recovery from Wastewater of the Coated Steel Wire Production: A Pilot Scale Study

Loza¹,

Loza²,

Korzhov³

et al. 2022

Preprint

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“…Conversion of quaternary ammonium bases to amines has a negative impact on the electrodialysis process at different levels [9]. First, it results in an increase of membrane resistance.…”

Section: Introductionmentioning

confidence: 99%

Use of electrochemical impedance spectroscopy to assess the stability of the anion exchange membrane MA-41, modified by poly-N,N-diallylmorpholine bromide in overlimiting current modes

Bondarev,

Achoh,

Bespalov

et al. 2023

Chim.Tech.Acta

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The paper presents the results of studying the electrochemical characteristics and long-term stability of MA-41 membranes on the surface of which poly-N,N-diallylmorpholinium bromide was applied. The deposition of a polyelectrolyte on the membrane surface leads to an increase in the limiting current from 0.8 to 1.1 mA/cm2. The comparison of the experimental and theoretically calculated values of the limiting current density allows us to conclude that the modification of the membrane surface by poly-N,N-diallylmorpholinium bromide does not lead to the formation of a continuous polyelectrolyte film on the surface, but its fixation occurs due to the sorption of macromolecules on the surface of the ion-exchanger particles. To quantify the rate of the water dissociation reaction at the membrane/solution interface, the method of electrochemical impedance was used, which makes it possible to compare the rate constants of the water dissociation reaction for different membranes, assuming that the reaction is described by the Gericher impedance. It is shown that modification of the MA-41 membrane surface leads to a decrease in the rate of the water dissociation reaction in the current range i = 1.5–4ilim by a factor of 2–6. The reduction in water dissociation reaction rate is attributed to the substitution of catalytically active secondary and tertiary amino groups in the surface layer of the pristine membrane by stable heterocyclic ammonium bases of poly-N,N-diallylmorpholinium. The study of the long-term stability of the resulting membrane showed that when the membrane is polarized with a current equal to twice the limiting current, the desorption of the modifier occurs within 25 h, and the properties of the membrane become close to those of the unmodified MA-41 membrane. It was shown that the electrochemical impedance method can be used as a very sensitive method for studying the long-term stability of ion-exchange membranes.

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“…This method is promising and widely used for various purposes. With the help of reverse electrodialysis, it is possible to obtain drinking water [2], concentrate sulfuric acid [5], and reduce the content of anionic dyes, for example, Acid Orange 7 [6]. At the same time, reverse electrodialysis can be used to generate electric power during heat recovery in the form of a heat engine [7,8], using artificial solutions (for example, ammonium bicarbonate [9]) or microorganisms [10].…”

Section: Introductionmentioning

confidence: 99%

Determination of the applicability of the tungsten-containing material as low-cost electrodes for reverse electrodialysis

Кovalenko

Kotok

2021

EEJET

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Electrodialysis, especially reverse, is a promising method of water desalination, concentration of solutions, extraction of valuable components from waste and rinse water, and power generation. The main problem is the search for low-cost universal anode-cathode materials. The work aims to determine the possibility of using the VNZh90 superalloy (5 % Ni, 5 % Fe, 90 % W) and the electroplated Ni-W alloy as a universal cathode-anode material for reverse electrodialysis. The crystal structure of the Ni-W alloy was studied by X-ray diffraction analysis; the morphology was studied by scanning electron microscopy. The anodic behavior of both alloys was studied by voltammetry in 6 % HCl in a saturated NaCl solution. The high passivity of the VNZh90 superalloy was revealed. On the repeated anodic curve, the current density of the passivation plateau decreased 2.8 times and was 37 mA/dm2. This indicates that the use of the VNZh90 superalloy is promising as a universal cathode-anode material of a reverse electrodialyzer. The phenomenon of significant passivation for the Ni-W alloy was also revealed. The primary curve of the alloy showed two dissolution peaks and a well-defined passivation plateau. Probably, the first peak corresponded to a more active phase with a low W content. This was confirmed by the absence of the first peak on the repeated anodic curve and the identity of the passivation plateaus of the primary and repeated curves. The passivation current density was 209 mA/dm2. These data also indicate the possibility and prospects of using the electroplated Ni-W alloy as a universal cathode-anode material of a reverse electrodialyzer after optimizing the composition and deposition method of the alloy, as well as reducing the wear rate.

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Electrodialysis concentration of sulfuric acid

Cited by 6 publications

References 26 publications

Hybrid Membrane Technology for Acids Recovery from Wastewater of the Coated Steel Wire Production: A Pilot Scale Study

Hybrid Membrane Technology for Acids Recovery from Wastewater of the Coated Steel Wire Production: A Pilot Scale Study

Use of electrochemical impedance spectroscopy to assess the stability of the anion exchange membrane MA-41, modified by poly-N,N-diallylmorpholine bromide in overlimiting current modes

Determination of the applicability of the tungsten-containing material as low-cost electrodes for reverse electrodialysis

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