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<p>Residual moisture in molten salts hydrolyzes to form hydroxide (OH⁻) ions. Hydroxide dramatically increases the corrosivity of the molten salt and can threaten the integrity of materials in molten salt nuclear reactors (MSRs) and solar-thermal plants. Despite its importance, a reliable, real-time method to quantify OH⁻ in molten salts has yet to be developed. Here, we present a novel method for detecting and quantifying hydroxide ions in molten salts using near-infrared (NIR) spectroscopy. We also demonstrate the use of this in-situ NIR spectroscopy to monitor the removal of moisture from molten salts via chemical and electrochemical moisture removal processes. Additionally, the molar absorption coefficient for the 2ν<sub>OH</sub> vibration in molten LiCl–KCl at 773&#xa0;K was determined and reported based on the Beer–Lambert law. This study not only establishes a powerful spectroscopic tool for OH⁻ detection but also for real-time monitoring and control of salt purity in various molten salt applications.</p>

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In-situ near-infrared spectroscopic detection of hydroxides in molten LiCl–KCl for online purification and process monitoring

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Thomas R. Selmi,
  • Dev Chidambaram

摘要

Residual moisture in molten salts hydrolyzes to form hydroxide (OH⁻) ions. Hydroxide dramatically increases the corrosivity of the molten salt and can threaten the integrity of materials in molten salt nuclear reactors (MSRs) and solar-thermal plants. Despite its importance, a reliable, real-time method to quantify OH⁻ in molten salts has yet to be developed. Here, we present a novel method for detecting and quantifying hydroxide ions in molten salts using near-infrared (NIR) spectroscopy. We also demonstrate the use of this in-situ NIR spectroscopy to monitor the removal of moisture from molten salts via chemical and electrochemical moisture removal processes. Additionally, the molar absorption coefficient for the 2νOH vibration in molten LiCl–KCl at 773 K was determined and reported based on the Beer–Lambert law. This study not only establishes a powerful spectroscopic tool for OH⁻ detection but also for real-time monitoring and control of salt purity in various molten salt applications.