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Studies of dehydration kinetics of Li2SO4·H2O by the master plots method

✍ Scribed by Wanjun, Tang ;Donghua, Chen

Book ID
111487931
Publisher
Walter de Gruyter GmbH
Year
2007
Tongue
English
Weight
257 KB
Volume
5
Category
Article
ISSN
2391-5420

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✦ Synopsis

The kinetics of Li 2 SO 4 •H 2 O dehydration in static air atmosphere was studied on the basis of nonisothermal measurements by differential scanning calorimetry. Dehydration data were subjected to an integral composite procedure, which includes an isoconversional method, a master plots method and a model-fitting method. Avrami-Erofeev equation was found to describe all the experimental data in the range of conversion degrees from 0.1 to 0.9. The determined activation energy equals 65.45 kJ•mol -1 with standard deviation ±0.47 kJ•mol -1 . The estimated value of parameter m in Avrami-Erofeev equation is 2.15 with standard deviation ±0.11. Also, the obtained pre-exponential factor is 7.79×10 5 s -1 with standard deviation ±0.55×10 5 s -1 . The results show that the present integral composite procedure gives self-consistent kinetic parameters.

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✍ Tang Wanjun; Chen Donghua; Wang Cunxin 📂 Article 📅 2006 🏛 American Institute of Chemical Engineers 🌐 English ⚖ 316 KB 👁 2 views

## Abstract Thermal dehydration process of calcium oxalate monohydrate, CaC~2~O~4~ · H~2~O, was reinvestigated from a viewpoint of reaction kinetics. On the basis of data of thermogravimetry, kinetic analysis was performed under nonisothermal conditions using an integral composite procedure, which