Saturation Vapor Pressure of Water over Sodium Borohydride Dihydrate

IF 0.6 4区化学 Q4 CHEMISTRY, APPLIED

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI:10.1134/S1070427223050075

A. V. Shikhovtsev, O. V. Kravchenko, A. A. Vinokurov, M. V. Solov’ev, M. V. Tsvetkov, Yu. A. Dobrovol’skii

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Abstract

The relative humidity and saturated water vapor pressure resulted from the reversible equilibrium dissociation of crystalline NaBH₄·2H₂O in the temperature range 0–36°C were determined. Based on the data obtained for NaBH₄·2H₂O, the equilibrium water vapor pressure as a function of temperature ln P = –6567.1T^–1 + 23.863, enthalpy ∆Н₀ = 54 ± 0.8 kJ mol^–1 and entropy ∆S₀ =198 ± 2 J mol^–1 K^–1 of NaBH₄·2H₂O dissociation into NaBH₄ and H₂O, standard enthalpy ∆H°= –783 kJ mol^–1 and entropy ∆S° = 281 J mol^–1 K^–1 of formation of NaBH₄·2H₂O were calculated. An equation was derived for the humidity vs. temperature, which determines the regions of NaBH₄·2H₂O formation or its dissociation Rh = 0.334t + 17.5. It was shown that the pressure of saturated water vapor over a concentrated NaBH₄ solution (30 wt %) at temperatures up to 45°C has higher values compared to NaBH₄·2H₂O samples synthesized by two different methods.

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水在二水硼氢化钠上的饱和蒸汽压

摘要测定了晶体NaBH4-2H2O在0-36℃温度范围内可逆平衡解离产生的相对湿度和饱和水蒸气压。根据所获得的 NaBH4-2H2O 数据，平衡水蒸气压与温度的函数关系为 ln P = -6567.1T-1 + 23.863，焓 ∆Н0 = 54 ± 0.计算了 NaBH4-2H2O 解离成 NaBH4 和 H2O 的标准焓 ∆H°= -783 kJ mol-1 和熵 ∆S°= 281 J mol-1 K-1。得出了湿度与温度的关系式，它决定了 NaBH4-2H2O 形成或解离的区域 Rh = 0.334t + 17.5。研究表明，与用两种不同方法合成的 NaBH4-2H2O 样品相比，在最高 45°C 的温度下，浓 NaBH4 溶液（30 wt %）上的饱和水蒸气压力值更高。

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来源期刊

Russian Journal of Applied Chemistry 化学-应用化学

CiteScore

1.60

自引率

11.10%

发文量

审稿时长

2-4 weeks

期刊介绍： Russian Journal of Applied Chemistry (Zhurnal prikladnoi khimii) was founded in 1928. It covers all application problems of modern chemistry, including the structure of inorganic and organic compounds, kinetics and mechanisms of chemical reactions, problems of chemical processes and apparatus, borderline problems of chemistry, and applied research.