Sublimation rate of solid NaCl powders and evaporation rate of liquid NaCl upon heating in vacuum and air

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Alexander M. Laptev , Martin Bram
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引用次数: 0

Abstract

The volatilization of sodium chloride (NaCl) is important for multiple applications, such as energy storage, manufacturing porous parts, and purification and recycling of composites. Until now, only limited information on this feature has been published. To expand the knowledge in this field, we investigated the sublimation and evaporation of two NaCl powders by thermal gravimetry in vacuum and air. The study has shown that the volatilization kinetics of powders with different shapes and sizes are identical. The volatilization of NaCl powders in vacuum occurs mainly by sublimation before melting. In contrast, the volatilization of NaCl in the air is preferentially caused by the evaporation of the melt. In a vacuum, the evaporation of NaCl powder after melting is significantly slower than the sublimation before melting, because of a drastic decrease in the volatilization area. The Hertz-Knudsen relation with an appropriate fitting coefficient satisfactorily describes the mass loss by volatilization in vacuum and air.

Abstract Image

固体氯化钠粉末在真空和空气中加热时的升华速率和液体氯化钠的蒸发速率
氯化钠(NaCl)的挥发对多种应用都很重要,如能量储存、多孔部件制造、复合材料的净化和回收。到目前为止,有关这一特性的信息还很有限。为了扩展这一领域的知识,我们通过热重力仪研究了两种氯化钠粉末在真空和空气中的升华和蒸发。研究表明,不同形状和大小的粉末的挥发动力学是相同的。氯化钠粉末在真空中的挥发主要是在熔化前升华。相反,NaCl 在空气中的挥发主要是由熔体的蒸发引起的。在真空中,NaCl 粉末熔化后的蒸发速度明显慢于熔化前的升华速度,这是因为挥发面积急剧下降。具有适当拟合系数的赫兹-克努森(Hertz-Knudsen)关系式可以令人满意地描述真空和空气中挥发的质量损失。
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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