三甘醇溶液失活分析及降解特性研究

发布时间：2018-05-15 21:10

本文选题：三甘醇 + 失活　；参考：《高校化学工程学报》2017年05期

【摘要】：在利用XRD、IC和GC-MS检测三甘醇杂质成分的基础上,通过失活评价实验研究了不同含量的固体悬浮物、热稳定盐及有机杂质对三甘醇失活度的影响规律,利用热重分析法(TG)研究了三甘醇在氮气、氧气气氛下以不同升温速率进行的热降解和氧化降解行为,并采用Coats-Redfer法和分布活化能模型(DAEM)法求解三甘醇降解动力学模型。结果表明,Fe S、Mg~(2+)、Ca~(2+)、乙二酸和甘醇酸类是影响三甘醇失活的主要杂质,且杂质含量的提高会加剧失活程度;三甘醇热降解是级数为1的一步质量损失过程,而氧化降解是两段级数为1的质量损失过程,且氧化降解活化能远低于热降解活化能;升温速率的加快可促使三甘醇热解的初始温度、失重峰温度以及热解终温均向高温方向移动。通过对三甘醇的失活分析及降解特性研究可为进一步探索三甘醇降解机理和预防溶液失活提供理论基础。
[Abstract]:On the basis of the determination of triethylene glycol impurity by XRDD-IC and GC-MS, the effects of different contents of solid suspensions, thermostable salts and organic impurities on the deactivation of triethylene glycol were studied by deactivation evaluation experiment. The thermal degradation and oxidative degradation of triethylene glycol at different heating rates in nitrogen and oxygen atmosphere were studied by thermogravimetric analysis (TGA). The kinetic model of triethylene glycol degradation was solved by Coats-Redfer method and distributed activation energy model (DAEM). The results show that the main impurity affecting the inactivation of triethylene glycol is acetic acid and glycolic acid, and the increase of impurity content will aggravate the inactivation, and the thermal degradation of triethylene glycol is a one-step mass loss process of order 1. However, oxidative degradation is a two-stage mass loss process, and the activation energy of oxidative degradation is much lower than that of thermal degradation, and the acceleration of heating rate can promote the initial temperature of pyrolysis of triethylene glycol. The peak temperature of weightlessness and the final temperature of pyrolysis all move towards high temperature. The study on the deactivation and degradation characteristics of triethylene glycol can provide a theoretical basis for further exploring the degradation mechanism of triethylene glycol and preventing solution inactivation.
【作者单位】：西北大学化工学院;
【基金】：基金项目:陕西省青年科技新星(2016KJXX-32)
【分类号】：O645.1;TE644

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