Solubility of gaseous carbon dioxide in molten LiCl-Li2O

Takafumi Wakamatsu; Takuya Uchiyama; Shungo Natsui; Tatsuya Kikuchi; Ryosuke O. Suzuki

doi:10.1016/j.fluid.2014.10.046

Solubility of gaseous carbon dioxide in molten LiCl-Li₂O

Takafumi Wakamatsu, Takuya Uchiyama, Shungo Natsui, Tatsuya Kikuchi, Ryosuke O. Suzuki

IMRAM - Division of Process and System Engineering

Hokkaido University

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Carbonate ions in LiCl-Li₂O salt are a source of carbon contamination in the electrolytic refining of metal oxides, and their concentration is also an essential information for understanding the CO₂ decomposition process. In this study, the solubility of gaseous CO₂ in molten LiCl-Li₂O was studied with the goal of developing processes to decompose the oxides effectively. Ar-CO₂ gas mixtures were dissolved in molten salts containing various amounts of Li₂O, and the solubility of the CO₂ gas was calculated by measuring the mass difference between the molten salts before and after the CO₂ dissolution. The molar amount of dissolved CO₂ gas was almost as large as the molar quantity of Li₂O when the partial pressure of CO₂ was 1.0 or 0.5atm for Li₂O concentrations in the range of 0-60mol%. This confirms that a large quantity of the oxide ions reacted with the CO₂ gas, resulting in the generation of carbonate ions.

Original language	English
Pages (from-to)	48-53
Number of pages	6
Journal	Fluid Phase Equilibria
Volume	385
DOIs	https://doi.org/10.1016/j.fluid.2014.10.046
Publication status	Published - 2015 Jan 5

Keywords

Carbon dioxide
Molten salt
Phase diagram
Solubility

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10.1016/j.fluid.2014.10.046

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title = "Solubility of gaseous carbon dioxide in molten LiCl-Li2O",

abstract = "Carbonate ions in LiCl-Li2O salt are a source of carbon contamination in the electrolytic refining of metal oxides, and their concentration is also an essential information for understanding the CO2 decomposition process. In this study, the solubility of gaseous CO2 in molten LiCl-Li2O was studied with the goal of developing processes to decompose the oxides effectively. Ar-CO2 gas mixtures were dissolved in molten salts containing various amounts of Li2O, and the solubility of the CO2 gas was calculated by measuring the mass difference between the molten salts before and after the CO2 dissolution. The molar amount of dissolved CO2 gas was almost as large as the molar quantity of Li2O when the partial pressure of CO2 was 1.0 or 0.5atm for Li2O concentrations in the range of 0-60mol%. This confirms that a large quantity of the oxide ions reacted with the CO2 gas, resulting in the generation of carbonate ions.",

keywords = "Carbon dioxide, Molten salt, Phase diagram, Solubility",

author = "Takafumi Wakamatsu and Takuya Uchiyama and Shungo Natsui and Tatsuya Kikuchi and Suzuki, {Ryosuke O.}",

note = "Funding Information: The authors thank Ms Mika Kitamura of Hokkaido University for her experimental assistance. They also appreciate financial support from the Japan Science and Technology Agency (JST) – Advanced Low Carbon Technology Research and Development Program (ALCA). Publisher Copyright: {\textcopyright} 2014.",

year = "2015",

month = jan,

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doi = "10.1016/j.fluid.2014.10.046",

language = "English",

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AU - Wakamatsu, Takafumi

AU - Uchiyama, Takuya

AU - Natsui, Shungo

AU - Kikuchi, Tatsuya

AU - Suzuki, Ryosuke O.

N1 - Funding Information: The authors thank Ms Mika Kitamura of Hokkaido University for her experimental assistance. They also appreciate financial support from the Japan Science and Technology Agency (JST) – Advanced Low Carbon Technology Research and Development Program (ALCA). Publisher Copyright: © 2014.

PY - 2015/1/5

Y1 - 2015/1/5

N2 - Carbonate ions in LiCl-Li2O salt are a source of carbon contamination in the electrolytic refining of metal oxides, and their concentration is also an essential information for understanding the CO2 decomposition process. In this study, the solubility of gaseous CO2 in molten LiCl-Li2O was studied with the goal of developing processes to decompose the oxides effectively. Ar-CO2 gas mixtures were dissolved in molten salts containing various amounts of Li2O, and the solubility of the CO2 gas was calculated by measuring the mass difference between the molten salts before and after the CO2 dissolution. The molar amount of dissolved CO2 gas was almost as large as the molar quantity of Li2O when the partial pressure of CO2 was 1.0 or 0.5atm for Li2O concentrations in the range of 0-60mol%. This confirms that a large quantity of the oxide ions reacted with the CO2 gas, resulting in the generation of carbonate ions.

AB - Carbonate ions in LiCl-Li2O salt are a source of carbon contamination in the electrolytic refining of metal oxides, and their concentration is also an essential information for understanding the CO2 decomposition process. In this study, the solubility of gaseous CO2 in molten LiCl-Li2O was studied with the goal of developing processes to decompose the oxides effectively. Ar-CO2 gas mixtures were dissolved in molten salts containing various amounts of Li2O, and the solubility of the CO2 gas was calculated by measuring the mass difference between the molten salts before and after the CO2 dissolution. The molar amount of dissolved CO2 gas was almost as large as the molar quantity of Li2O when the partial pressure of CO2 was 1.0 or 0.5atm for Li2O concentrations in the range of 0-60mol%. This confirms that a large quantity of the oxide ions reacted with the CO2 gas, resulting in the generation of carbonate ions.

KW - Carbon dioxide

KW - Molten salt

KW - Phase diagram

KW - Solubility

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Solubility of gaseous carbon dioxide in molten LiCl-Li₂O

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Keywords

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