A. V. Shikhovtsev, O. V. Kravchenko, A. A. Vinokurov, M. V. Solov’ev, M. V. Tsvetkov, Yu. A. Dobrovol’skii
{"title":"水在二水硼氢化钠上的饱和蒸汽压","authors":"A. V. Shikhovtsev, O. V. Kravchenko, A. A. Vinokurov, M. V. Solov’ev, M. V. Tsvetkov, Yu. A. Dobrovol’skii","doi":"10.1134/S1070427223050075","DOIUrl":null,"url":null,"abstract":"<p>The relative humidity and saturated water vapor pressure resulted from the reversible equilibrium dissociation of crystalline NaBH<sub>4</sub>·2H<sub>2</sub>O in the temperature range 0–36°C were determined. Based on the data obtained for NaBH<sub>4</sub>·2H<sub>2</sub>O, the equilibrium water vapor pressure as a function of temperature ln <i>P</i> = –6567.1<i>T</i><sup>–1</sup> + 23.863, enthalpy ∆<i>Н</i><sub>0</sub> = 54 ± 0.8 kJ mol<sup>–1</sup> and entropy ∆<i>S</i><sub>0</sub> =198 ± 2 J mol<sup>–1</sup> K<sup>–1</sup> of NaBH<sub>4</sub>·2H<sub>2</sub>O dissociation into NaBH<sub>4</sub> and H<sub>2</sub>O, standard enthalpy ∆<i>H</i>°= –783 kJ mol<sup>–1</sup> and entropy ∆<i>S</i>° = 281 J mol<sup>–1</sup> K<sup>–1</sup> of formation of NaBH<sub>4</sub>·2H<sub>2</sub>O were calculated. An equation was derived for the humidity vs. temperature, which determines the regions of NaBH<sub>4</sub>·2H<sub>2</sub>O formation or its dissociation Rh = 0.334<i>t</i> + 17.5. It was shown that the pressure of saturated water vapor over a concentrated NaBH<sub>4</sub> solution (30 wt %) at temperatures up to 45°C has higher values compared to NaBH<sub>4</sub>·2H<sub>2</sub>O samples synthesized by two different methods.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Saturation Vapor Pressure of Water over Sodium Borohydride Dihydrate\",\"authors\":\"A. V. Shikhovtsev, O. V. Kravchenko, A. A. Vinokurov, M. V. Solov’ev, M. V. Tsvetkov, Yu. A. Dobrovol’skii\",\"doi\":\"10.1134/S1070427223050075\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The relative humidity and saturated water vapor pressure resulted from the reversible equilibrium dissociation of crystalline NaBH<sub>4</sub>·2H<sub>2</sub>O in the temperature range 0–36°C were determined. Based on the data obtained for NaBH<sub>4</sub>·2H<sub>2</sub>O, the equilibrium water vapor pressure as a function of temperature ln <i>P</i> = –6567.1<i>T</i><sup>–1</sup> + 23.863, enthalpy ∆<i>Н</i><sub>0</sub> = 54 ± 0.8 kJ mol<sup>–1</sup> and entropy ∆<i>S</i><sub>0</sub> =198 ± 2 J mol<sup>–1</sup> K<sup>–1</sup> of NaBH<sub>4</sub>·2H<sub>2</sub>O dissociation into NaBH<sub>4</sub> and H<sub>2</sub>O, standard enthalpy ∆<i>H</i>°= –783 kJ mol<sup>–1</sup> and entropy ∆<i>S</i>° = 281 J mol<sup>–1</sup> K<sup>–1</sup> of formation of NaBH<sub>4</sub>·2H<sub>2</sub>O were calculated. An equation was derived for the humidity vs. temperature, which determines the regions of NaBH<sub>4</sub>·2H<sub>2</sub>O formation or its dissociation Rh = 0.334<i>t</i> + 17.5. It was shown that the pressure of saturated water vapor over a concentrated NaBH<sub>4</sub> solution (30 wt %) at temperatures up to 45°C has higher values compared to NaBH<sub>4</sub>·2H<sub>2</sub>O samples synthesized by two different methods.</p>\",\"PeriodicalId\":757,\"journal\":{\"name\":\"Russian Journal of Applied Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2024-03-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Russian Journal of Applied Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1070427223050075\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Applied Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S1070427223050075","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
Saturation Vapor Pressure of Water over Sodium Borohydride Dihydrate
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.
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.
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