High Diffusion Permeability of Anion-Exchange Membranes for Ammonium Chloride: Experiment and Modeling

Skolotneva, Ekaterina; Tsygurina, Kseniia; Mareev, Semyon; Melnikova, Ekaterina; Pismenskaya, Natalia; Nikonenko, Victor

doi:10.3390/ijms23105782

Cited by 11 publications

(12 citation statements)

References 64 publications

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“…However, this does not allow one to expect a zero concentration of alkanolamine in the concentration chamber. As was shown in the work [ 28 ], there is a mechanism of ammonium ion transfer through an anion-exchange membrane under certain boundary conditions.…”

Section: Introductionmentioning

confidence: 94%

Monoethanolamine (MEA) Degradation: Influence on the Electrodialysis Treatment of MEA-Absorbent

et al. 2023

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The thermal-oxidative degradation of aqueous solutions of carbonized monoethanolamine (MEA, 30% wt., 0.25 mol MEA/mol CO2) was studied for 336 h at 120 °C. Based on the change in the color of the solution and the formation of a precipitate, the occurrence of thermal-oxidative degradation of the MEA solution with the formation of destruction products, including insoluble ones, was confirmed. The electrokinetic activity of the resulting degradation products, including insoluble ones, was studied during the electrodialysis purification of an aged MEA solution. To understand the influence of degradation products on the ion-exchange membrane properties, a package of samples of MK-40 and MA-41 ion-exchange membranes was exposed to a degraded MEA solution for 6 months. A comparison of the efficiency of the electrodialysis treatment of a model absorption solution of MEA before and after long-time contact with degraded MEA showed that the depth of desalination was reduced by 34%, while the magnitude of the current in the ED apparatus was reduced by 25%. For the first time, the regeneration of ion-exchange membranes from MEA degradation products was carried out, which made it possible to restore the depth of desalting in the ED process by 90%.

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Section: Introductionmentioning

confidence: 94%

Monoethanolamine (MEA) Degradation: Influence on the Electrodialysis Treatment of MEA-Absorbent

et al. 2023

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“…It should be noted that the equations used in the framework of the phenomenological approach may include phenomenological coefficients that directly or indirectly reflect the structural features of the membrane. For example, such coefficients can be evaluated via tortuosity factor, τ, used to take into account the fact that ion transport in the membrane is slower than in solution due to its dense structure [70][71][72]; membrane porosity, p m , can be accounted for also to express the fact that ions and water can only pass through the pores of the membrane [30,73,74].…”

Section: Irreversible Thermodynamicsmentioning

confidence: 99%

“…Using this simple approach, it is possible to explain the deviation of the IEM behavior from the classical one in solutions of weak electrolytes (such as phosphate or tartrate salts) and explain some features of this behavior compared with that in strong electrolyte solutions: the appearance of a second limiting current [145], increased diffusion permeability [74] or unusual concentration dependence of membrane conductivity [146]. Models based on TMS shed light on the transient characteristics of IEMs [128] and provide an explanation for scaling formation on surfaces in solutions with multivalence ions [147].…”

Section: Modeling Of Ion and Water Transport In Iemsmentioning

confidence: 99%

Ion and Water Transport in Ion-Exchange Membranes for Power Generation Systems: Guidelines for Modeling

Mareev

Gorobchenko

Ivanov

et al. 2022

IJMS

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Artificial ion-exchange and other charged membranes, such as biomembranes, are self-organizing nanomaterials built from macromolecules. The interactions of fragments of macromolecules results in phase separation and the formation of ion-conducting channels. The properties conditioned by the structure of charged membranes determine their application in separation processes (water treatment, electrolyte concentration, food industry and others), energy (reverse electrodialysis, fuel cells and others), and chlore-alkali production and others. The purpose of this review is to provide guidelines for modeling the transport of ions and water in charged membranes, as well as to describe the latest advances in this field with a focus on power generation systems. We briefly describe the main structural elements of charged membranes which determine their ion and water transport characteristics. The main governing equations and the most commonly used theories and assumptions are presented and analyzed. The known models are classified and then described based on the information about the equations and the assumptions they are based on. Most attention is paid to the models which have the greatest impact and are most frequently used in the literature. Among them, we focus on recent models developed for proton-exchange membranes used in fuel cells and for membranes applied in reverse electrodialysis.

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“…The key step between the production and application of hydrogen is its separation and purification [13]. The membrane separation method is widely used in many areas, including hydrogen energy, due to its simplicity, low cost, high energy efficiency, and environmental friendliness [14][15][16][17]. The need to design and produce membrane filters with increased hydrogen permeability and durability has formed an interest in exploring different materials with the best performance and hydrogen resistance.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Hydrogen-Selective Pd-Ag Membranes Modified with Pd-Pt Nanoparticles for Use in Steam Reforming Membrane Reactors

Petriev,

Pushankina,

Andreev

et al. 2023

IJMS

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A unique method for synthesizing a surface modifier for metallic hydrogen permeable membranes based on non-classic bimetallic pentagonally structured Pd-Pt nanoparticles was developed. It was found that nanoparticles had unique hollow structures. This significantly reduced the cost of their production due to the economical use of metal. According to the results of electrochemical studies, a synthesized bimetallic Pd-Pt/Pd-Ag modifier showed excellent catalytic activity (up to 60.72 mA cm−2), long-term stability, and resistance to COads poisoning in the alkaline oxidation reaction of methanol. The membrane with the pentagonally structured Pd-Pt/Pd-Ag modifier showed the highest hydrogen permeation flux density, up to 27.3 mmol s−1 m−2. The obtained hydrogen flux density was two times higher than that for membranes with a classic Pdblack/Pd-Ag modifier and an order of magnitude higher than that for an unmodified membrane. Since the rate of transcrystalline hydrogen transfer through a membrane increased, while the speed of transfer through defects remained unchanged, a one and a half times rise in selectivity of the developed Pd-Pt/Pd-Ag membranes was recorded, and it amounted to 3514. The achieved results were due to both the synergistic effect of the combination of Pd and Pt metals in the modifier composition and the large number of available catalytically active centers, which were present as a result of non-classic morphology with high-index facets. The specific faceting, defect structure, and unusual properties provide great opportunities for the application of nanoparticles in the areas of membrane reactors, electrocatalysis, and the petrochemical and hydrogen industries.

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High Diffusion Permeability of Anion-Exchange Membranes for Ammonium Chloride: Experiment and Modeling

Cited by 11 publications

References 64 publications

Monoethanolamine (MEA) Degradation: Influence on the Electrodialysis Treatment of MEA-Absorbent

Monoethanolamine (MEA) Degradation: Influence on the Electrodialysis Treatment of MEA-Absorbent

Ion and Water Transport in Ion-Exchange Membranes for Power Generation Systems: Guidelines for Modeling

High-Performance Hydrogen-Selective Pd-Ag Membranes Modified with Pd-Pt Nanoparticles for Use in Steam Reforming Membrane Reactors

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