Wei Mengning, Huang An-Chi, Shu Chi-Min, Zhang Lijing
College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 210009, Jiangsu, P. R. China.
Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology (YunTech), Yunlin, 64002, Taiwan, Republic of China.
Sci Rep. 2019 Feb 7;9(1):1592. doi: 10.1038/s41598-018-38434-1.
Ethanolamine is a critical chemical for petrochemical enterprises. When corrosion occurs in pipelines, equipment, and containers in petrochemical enterprises, minute amounts of metal ions are released. In this study, the thermal decomposition and nonisothermal kinetics of monoethanolamine (MEA) and MEA mixed with copper and zinc ions were analyzed using thermogravimetry (TG) and differential scanning calorimetry (DSC). The TG tests revealed that MEA mixed with copper (II) and zinc (II) began thermal decomposition at 75.2 and 60.3 °C, respectively, whereas pure MEA began thermal decomposition at 89.7 °C. Two exothermic peaks were observed in the DSC curves for MEA mixed with copper (II) and zinc (II), and thermokinetic parameters were obtained from DSC data. The apparent activation energy (E) of each stage was calculated using several nonisothermal kinetic methods, namely the ASTM E698, Kissinger-Akahira-Sunose, Starink, and Flynn-Wall-Ozawa methods. The E of pure MEA was 28.7 ± 2.5 kJ/mol, whereas that of the copper and zinc mixtures were 80.5 ± 1.1 and 46.8 ±1.7 kJ/mol, respectively. The results can be used to improve the intrinsic safety of storage tanks and petrochemical plants.
乙醇胺是石化企业的关键化学品。当石化企业的管道、设备和容器发生腐蚀时，会释放微量金属离子。本研究采用热重分析法（TG）和差示扫描量热法（DSC）分析了单乙醇胺（MEA）以及与铜离子和锌离子混合的MEA的热分解和非等温动力学。TG测试表明，与铜（II）和锌（II）混合的MEA分别在75.2和60.3 °C开始热分解，而纯MEA在89.7 °C开始热分解。在与铜（II）和锌（II）混合的MEA的DSC曲线中观察到两个放热峰，并从DSC数据中获得了热动力学参数。使用几种非等温动力学方法，即ASTM E698、基辛格-赤平-ose、斯塔林克和弗林-沃尔-小泽方法，计算了每个阶段的表观活化能（E）。纯MEA的E为28.7±2.5 kJ/mol，而铜和锌混合物的E分别为80.5±1.1和46.8±1.7 kJ/mol。这些结果可用于提高储罐和石化厂的本质安全性。
