CAJ | 학술논문

采用热重分析法研究了硬脂酸甲酯、油酸甲酯和亚油酸甲酯在氮气气氛中的热分解特性,并采用Coats-Redfern积分法对硬脂酸甲酯、油酸甲酯和亚油酸甲酯的热分解过程进行动力学分析,建立热分解模型. 结果表明:硬脂酸甲酯和油酸甲酯的热分解过程表现为简单的一步分解,而亚油酸甲酯则呈现出较复杂的两步分解过程;随着升温速率提高,热分解区间向高温区移动,热分解活化能和指前因子呈现出较好的动力学补偿效应,且在不同升温速率下具有不同的热分解反应机理函数;模拟计算的热分解率与实验数据误差基本在10%左右. 动力学模型能够很好地预测各脂肪酸甲酯热分解过程,为进一步扩大试验和生物柴油应用中的高温热分解衰变模型提供理论依据.
채용열중분석법연구료경지산갑지、유산갑지화아유산갑지재담기기분중적열분해특성,병채용Coats-Redfern적분법대경지산갑지、유산갑지화아유산갑지적열분해과정진행동역학분석,건립열분해모형. 결과표명:경지산갑지화유산갑지적열분해과정표현위간단적일보분해,이아유산갑지칙정현출교복잡적량보분해과정;수착승온속솔제고,열분해구간향고온구이동,열분해활화능화지전인자정현출교호적동역학보상효응,차재불동승온속솔하구유불동적열분해반응궤리함수;모의계산적열분해솔여실험수거오차기본재10%좌우. 동역학모형능구흔호지예측각지방산갑지열분해과정,위진일보확대시험화생물시유응용중적고온열분해쇠변모형제공이론의거.
The pyrolysis characteristics of methyl stearate, methyl oleate and methyl linoleate were studied by thermo - gravimetric analysis method in nitrogen atmosphere. The kinetics analysises of pyrolysis processes of methyl stearate, methyl oleate and methyl linoleate were carried out by Coats-Redfern inte-gral method to set thermal decomposition models. The results showed that pyrolysis processes of methyl stearate and methyl oleate were simple one step decomposition, while the pyrolysis process of methyl lino-leate was relatively complicated two step decomposition; the pyrolysis region shifted toward the higher temperature region when heating rate increased. Moreover, the pyrolysis activation energy and pre-expo-nential factor presented a good kinetics compensation effect, and the pyrolysis reaction mechanism func-tions were different at different heating rates. The error of pyrolysis rates between analog calculation data and experimental data was about 10%. The kinetics models were able to accurately predict the pyrolysis processes of the mentioned fatty acid methyl esters, which could provide theoretical foundation for further bench-scale research and high temperature thermal decomposition decay model in biodiesel application.