Study on Non-Isothermal Decomposition Kinetics of Methionine

被引：0
|
作者：
Niu Q. [1 ]
Zhou C.-R. [1 ]
Zhan Z.-L. [1 ]
机构：
[1] School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou
来源：
Zhou, Cai-Rong (zhoucairong@zzu.edu.cn) | 2018年 / Zhejiang University卷 / 32期
关键词：
Methionine; Non-isothermal decomposition kinetics; TG-DTA; Thermal decomposition;
D O I：
10.3969/j.issn.1003-9015.2018.05.016
中图分类号：
学科分类号：
摘要：
Thermal stability and decomposition kinetics of methionine under nitrogen atmosphere were investigated by DTA-TGA. The results show that the melting process of methionine is accompanied by decomposition. When studied using DTG-60 and DSC-60 at different heating rates of 5, 10, 15, 20, 25 K•min -1 , the calculated activation energy (E s ) and pre-exponential factor (lgA s ) via Flynn-Wall-Ozawa, Kissinger and Šatava-Šesták methods are 155.59 kJ∙mol -1 and 194.06 min -1 , respectively. The mechanism of the thermal decomposition was through chemical reaction and the integral equation G(α) = -ln(1-α) was obtained. Moreover, thermodynamic results show that enthalpy change ΔH, entropy change ΔS and the change of Gibbs free energy ΔG are 1604.52 kJ∙mol -1 , 1787.7 J∙mol -1 ∙K -1 and 618.437 kJ∙mol -1 , respectively. This study provides fundamental data for further development and utilization of methionine. © 2018, Editorial Board of "Journal of Chemical Engineering of Chinese Universities". All right reserved.
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页码：1112 / 1118
页数：6
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