Measurements of the Dynamic Viscosity and Density of KOH Solutions at Atmospheric Pressure

Kuznetsov, Konstantin; Скородумов, С. В.; Granchenko, P. P.

doi:10.1134/s0018151x20060127

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…For example, at 293 K, the increase in hydroxide concentration from 1 M to 5 M led to a 40% increased in viscosity. In addition, the present measurements were in agreement with the ones of Kuznetsov et al [66].…”

Section: Nomenclaturesupporting

confidence: 93%

Progress toward a better understanding of the urea oxidation by electromediation of Ni(III)/Ni(II) system in alkaline media

Hopsort

Carmo

Latapie

et al. 2023

Electrochimica Acta

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Section: Nomenclaturesupporting

confidence: 93%

Progress toward a better understanding of the urea oxidation by electromediation of Ni(III)/Ni(II) system in alkaline media

Hopsort

Carmo

Latapie

et al. 2023

Electrochimica Acta

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“…Guo et al measured the density of KOH at low temperatures, 15–60 °C, and concentrations of 2–15 wt %. Kuznetsov et al obtained measured data in a similar temperature range of 20–70 °C, at 10–40 wt %. Soehnel and Novotny carried out measurements in the temperature range 0–100 °C at 5–60 wt %.…”

Section: Resultsmentioning

confidence: 92%

“…Various sources have reported dynamic viscosity data for aq. KOH, ,,,, as well as mathematical correlations for calculating dynamic viscosity at various temperatures and concentration (see Table ). , The table lists publications for temperature and concentration ranges relevant for alkaline electrolysis, that is, temperatures between 0 and 250 °C (low temperature and intermediate temperature alkaline electrolysis) and concentration ranges between 0 and 50 wt %.…”

Section: Resultsmentioning

confidence: 99%

Critical Analysis of Published Physical Property Data for Aqueous Potassium Hydroxide. Collation into Detailed Models for Alkaline Electrolysis

et al. 2023

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Physical properties of aqueous KOH solutions are crucial to the design and operation of alkaline electrolyzers but have been scarcely and sometimes unreliably reported. Obtaining published data for various properties currently requires timeconsuming searches and subsequent interpretation, interpolation, and extrapolation. This work collates and critically analyzes published data for a range of physical properties relevant to alkaline electrolysis, including the density, viscosity, conductivity, surface tension, oxygen/hydrogen solubility, oxygen/hydrogen diffusivity, and water vapor pressures of aqueous KOH solutions, as a function of temperature, KOH molarity, and pressure. Correlation functions, in the form of excel spreadsheets, have been developed to allow interpolation of the most reliable data and computation of desired quantities at specific temperatures, pressures, and KOH concentrations. Composite models incorporating these properties have been developed for automated computation of (i) diffusive gas crossover and (ii) gas production volumes, including (iii) water vapor content, and associated (iv) dissolved gas concentrations in the liquid electrolyte, as a function of KOH concentration, temperature, pressure, current density, and separator thickness and porosity. These spreadsheets are provided in the Supporting Information, as tools and reference points for researchers and practitioners in alkaline electrolysis.

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“…The increase of temperature can improve the reactivity, reduce the viscosity of the system (Figure S1, Supporting Information), enhance the mass transfer, and thus promote the leaching reaction. , According to the change of the lithium extraction efficiency with temperature as shown in Figure (a), the leaching process could be divided into the following stages: (1) From 423.15 to 473.15 K, the total extraction efficiency increased slowly. The efficiency converted to the solid phase increased significantly at 473.15 K, which was consistent with the weakening of the diffraction peaks of α-spodumene and the appearance of Li 2 SiO 3 in the XRD patterns (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution

Qiu

Zhu

Jiang

et al. 2022

Ind. Eng. Chem. Res.

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Lithium extraction from α-spodumene in a potassium hydroxide solution was proposed to provide a new green metallurgical process for spodumene concentrate. The structure of α-spodumene could be destroyed directly by a KOH solution, and new solid-phase products of Li2SiO3 and KAlSiO4 were generated simultaneously. The total lithium extraction efficiency could reach 89.9%, of which 84.1% was converted into Li2SiO3 and 5.8% converted into the liquid phase under optimal conditions: initial KOH concentration of 50 wt %, stirring speed of 500 rpm, mass ratio of KOH/ore of 2:1, leaching temperature of 523.15 K, and leaching time of 16 h. The experimental data fitted well with the Avrami–Erofeev equation model, –ln(1 – X) = (Kt) n . The apparent activation energy and Avrami index were calculated as 106.37 kJ·mol–1 and 0.80, respectively.

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Measurements of the Dynamic Viscosity and Density of KOH Solutions at Atmospheric Pressure

Cited by 10 publications

References 8 publications

Progress toward a better understanding of the urea oxidation by electromediation of Ni(III)/Ni(II) system in alkaline media

Progress toward a better understanding of the urea oxidation by electromediation of Ni(III)/Ni(II) system in alkaline media

Critical Analysis of Published Physical Property Data for Aqueous Potassium Hydroxide. Collation into Detailed Models for Alkaline Electrolysis

Kinetics and Mechanism of Lithium Extraction from α-Spodumene in Potassium Hydroxide Solution

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