Microwave-assisted dehydration of strontium hydroxide octahydrate: Experimental study and kinetic modeling analysis

doi:10.1016/j.cjche.2024.08.013

中国化学工程学报 ›› 2025, Vol. 77 ›› Issue (1): 207-217.DOI: 10.1016/j.cjche.2024.08.013

Microwave-assisted dehydration of strontium hydroxide octahydrate: Experimental study and kinetic modeling analysis

Wankun Wang^1,2, Fuchun Wang^1,2

1. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China;
2. School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang 550003, China

收稿日期:2024-06-22 修回日期:2024-08-22 接受日期:2024-08-22 出版日期:2025-01-28 发布日期:2024-10-21
通讯作者: Fuchun Wang,E-mail:fuchunhelichn@126.com
基金资助:
This work was supported by the Research Program of the Science and Technology Department of Guizhou Province (Qiankehe Jichu [2019]1418), the Research Program of Talented Scholars of Guizhou Institute of Technology (XJGC20190965).

Microwave-assisted dehydration of strontium hydroxide octahydrate: Experimental study and kinetic modeling analysis

Wankun Wang^1,2, Fuchun Wang^1,2

1. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China;
2. School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang 550003, China

Received:2024-06-22 Revised:2024-08-22 Accepted:2024-08-22 Online:2025-01-28 Published:2024-10-21
Contact: Fuchun Wang,E-mail:fuchunhelichn@126.com
Supported by:
This work was supported by the Research Program of the Science and Technology Department of Guizhou Province (Qiankehe Jichu [2019]1418), the Research Program of Talented Scholars of Guizhou Institute of Technology (XJGC20190965).

摘要/Abstract

摘要： In this context, the present study proposes the use of microwave irradiation to improve the dehydration rate and efficiency of strontium hydroxide octahydrate (Sr(OH)₂·8H₂O) without introducing contaminants. This study revealed that the use of microwave irradiation to dehydrate Sr(OH)₂·8H₂O is feasible and surprisingly efficient. The effects of this approach on important parameters were investigated using response surface methodology (RSM). The results revealed that the microwave dehydration process follows a linear polynomial model. In addition, compared with the heating time and material thickness, the microwave-assisted dehydration of Sr(OH)₂·8H₂O is sensitive to the microwave power and not to the material mass. The relative dehydration percentage reached 99.99% when heated in a microwave oven at 950 W for just 3 min. In contrast, a relative dehydration percentage of 94.6% was reached when heated in an electric furnace at 180 ℃ for 120 min. The XRD spectra also revealed that most of the Sr(OH)₂·8H₂O transformed into Sr(OH)₂ after dehydration via microwave irradiation, whereas a significant portion of the Sr(OH)₂·H₂O remained after conventional electric dehydration. The experimental data were fitted and analyzed via the thin-layer drying dynamics model, and the results indicated that the dehydrating behavior of Sr(OH)₂·8H₂O could be well described by the Page model.

关键词: Dehydration, Kinetic, Sr(OH)₂, 8H₂O, Microwave, Response surface methodology

Abstract: In this context, the present study proposes the use of microwave irradiation to improve the dehydration rate and efficiency of strontium hydroxide octahydrate (Sr(OH)₂·8H₂O) without introducing contaminants. This study revealed that the use of microwave irradiation to dehydrate Sr(OH)₂·8H₂O is feasible and surprisingly efficient. The effects of this approach on important parameters were investigated using response surface methodology (RSM). The results revealed that the microwave dehydration process follows a linear polynomial model. In addition, compared with the heating time and material thickness, the microwave-assisted dehydration of Sr(OH)₂·8H₂O is sensitive to the microwave power and not to the material mass. The relative dehydration percentage reached 99.99% when heated in a microwave oven at 950 W for just 3 min. In contrast, a relative dehydration percentage of 94.6% was reached when heated in an electric furnace at 180 ℃ for 120 min. The XRD spectra also revealed that most of the Sr(OH)₂·8H₂O transformed into Sr(OH)₂ after dehydration via microwave irradiation, whereas a significant portion of the Sr(OH)₂·H₂O remained after conventional electric dehydration. The experimental data were fitted and analyzed via the thin-layer drying dynamics model, and the results indicated that the dehydrating behavior of Sr(OH)₂·8H₂O could be well described by the Page model.

Key words: Dehydration, Kinetic, Sr(OH)₂, 8H₂O, Microwave, Response surface methodology

Wankun Wang, Fuchun Wang. Microwave-assisted dehydration of strontium hydroxide octahydrate: Experimental study and kinetic modeling analysis[J]. 中国化学工程学报, 2025, 77(1): 207-217.

Wankun Wang, Fuchun Wang. Microwave-assisted dehydration of strontium hydroxide octahydrate: Experimental study and kinetic modeling analysis[J]. Chinese Journal of Chemical Engineering, 2025, 77(1): 207-217.

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Microwave-assisted dehydration of strontium hydroxide octahydrate: Experimental study and kinetic modeling analysis

Microwave-assisted dehydration of strontium hydroxide octahydrate: Experimental study and kinetic modeling analysis

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