Measurements of Vapor Pressures of Aqueous Solutions in the NaCl–KCl–H2O System from 493.15 to 693.25 K in a Fused Silica Capillary High-Pressure Optical Cell
Measurements of Vapor Pressures of Aqueous Solutions in the NaCl–KCl–H2O System from 493.15 to 693.25 K in a Fused Silica Capillary High-Pressure Optical Cell
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DOI：
10.1021/acs.jced.9b00993
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发表时间：
2020-01
影响因子：
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通讯作者：
Ying Chen;I. Chou
中科院分区：
文献类型：
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作者：
Ying Chen;I. Chou
缺乏地质和工业上重要的含有两种或多种电解质的水溶液的蒸气压数据，特别是在高温（>373 K）下。在本研究中，开发了一种方法来测量同时含有 NaC1 和 KCl 的水溶液的蒸气压，摩尔浓度为 (1) 0.5 mol/kg NaC1 和 0.5 mol/kg KCl，(2) 1 mol/kg NaCl 和 1 mol/kg KCl，以及 (3) 2 mol/kg NaCl 和 2 mol/kg KCl，温度为 493.15 至693.25 K。通过将我们测量的纯 H2O 的蒸气压与先前确定的数据进行比较来验证该方法，并通过将我们测量的含有 1 和 3 mol/kg 浓度的 NaCl 或 KCl 的水溶液的蒸气压与先前的数据和模型进行比较来进一步测试。该研究不仅首次提供了三元NaCl-KCl-H2O体系在高温下的蒸气压数据，而且为各种地质和工业过程中常见的多组分水溶液在高温下的蒸气压测量建立了可靠的实验方法。
Vapor pressure data of geologically and industrially important aqueous solutions containing two or more electrolytes are lacking, especially at high temperatures (>373 K). In this study, a method was developed to measure the vapor pressures of aqueous solutions containing both NaC1 and KC1, with molalities of (1) 0.5 mol/kg NaC1 and 0.5 mol/kg KCl, (2) 1 mol/kg NaCl and 1 mol/kg KCl, and (3) 2 mol/kg NaCl and 2 mol/kg KCl, at temperatures from 493.15 to 693.25 K. This method was verified by comparing our measured vapor pressures of pure H2O with the previously well -established data and was further tested by comparing our measured vapor pressures of aqueous solutions containing either NaCl or KCl at 1 and 3 mol/kg concentrations with previous data and models. This study not only provided the vapor pressure data for the ternary NaCl-KCl-H2O system at elevated temperatures for the first time but also established a reliable experimental method for vapor pressure measurements of multicomponent aqueous solutions commonly involved in various geological and industrial processes at elevated temperatures.