| 在非等温条件下石膏和硼石膏的加热脱水动力学研究 |
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| 作者姓名： | I.Y.Elbeyli S.Piskin |
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| 作者单位： | DepartmentofChemicalEngineering,YildizTechnicalUniversity,34210,Topkapt,Istanbul,Turkey |
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| 基金项目： | Supported by the Turkish Republic Prime Ministry State Planning Organization (No. 98-DPT-07-01-02) and the Yildiz Technical University Research Foundation (No. 95-B-07-01-04). |
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| 摘 要： | Thermal dehydration of gypsum and borogypsum was investigated under nonisothermal conditions in air by using simultaneous thermogravimetric-differential thermal analyzer. Nonisothermal experiments were carried out at various linear heating rates. Kinetics of dehydration in the temperature range of 373-503 K were evaluated from the DTA (differential thermal analysis)-TGA (thermogravimetric analysis) data by means of Coats-Redfern,Kissinger and Doyle Equations. Values of the activation energy and the pre-exponential factor of the dehydration were calculated. The results of thermal experiments and kinetic parameters indicated that borogypsum is similar to gypsum from dehydration mechanism point of view although it consists of boron and small amount of alkali metal oxides.
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| 关 键 词： | 热量分析 动力学 脱水技术 石膏 等温条件 |
| 修稿时间： | |
Thermal Dehydration Kinetics of Gypsum and Borogypsum under Non-isothermal Conditions |
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| I.Y.Elbeyli,S.Piskin.Thermal Dehydration Kinetics of Gypsum and Borogypsum under Non-isothermal Conditions[J].Chinese Journal of Chemical Engineering,2004,12(2):302-305. |
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| Authors: | IYElbeyli SPiskin |
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| Affiliation: | Department of Chemical Engineering, Yildiz Technical University, 34210, Topkapt, Istanbul, Turkey |
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| Abstract: | Thermal dehydration of gypsum and borogypsum was investigated under nonisothermal conditions in air by using simultaneous thermogravimetric-differential thermal analyzer. Nonisothermal experiments were carried out at various linear heating rates. Kinetics of dehydration in the temperature range of 373-503 K were evaluated from the DTA (differential thermal analysis)-TGA (thermogravimetric analysis) data by means of Coats-Redfern,Kissinger and Doyle Equations. Values of the activation energy and the pre-exponential factor of the dehydration were calculated. The results of thermal experiments and kinetic parameters indicated that borogypsum is similar to gypsum from dehydration mechanism point of view although it consists of boron and small amount of alkali metal oxides. |
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| Keywords: | gypsum borogypsum differential thermal analysis thermogravimetric analysis kinetics |
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