Solid–liquid equilibria and non-isothermal crystallization kinetics of n-alkanes binary systems

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
Chang Li, Luguang Qi, Peng Shi, Zhenxing Zhu, Chuang Xie
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Abstract

Paraffin wax containing n-alkanes has received significant attention in the field of thermal energy storage. The crystallization process is regarded as the main thermal discharging method, which has a profound influence on the thermal performances of paraffin wax. Herein, the phase diagrams of binary systems n-heneicosane + n-pentacosane (C21-C25) and n-pentacosane + n-octacosane (C25-C28) were measured. The results showed that the ordered form was replaced by the rotator form and ultimately transited into a liquid with increasing temperature. Jeziorny and Mo models were used to describe the non-isothermal crystallization process of C25, C21-C25 and C25-28. The effective crystallization activation energy (\(\Delta {E}_{\text{m}}\)) for the non-isothermal crystallization process of n-alkanes was analyzed using the differential isoconversional method of Friedman. The addition of C21 and C28 was found to have a positive effect on the nucleation; while, a negative effect on the growth process, representing negative net effect on crystallization rate.

Abstract Image

正构烷烃二元体系的固液平衡和非等温结晶动力学
含有正构烷烃的石蜡在热能储存领域备受关注。结晶过程被认为是主要的热释放方式,对石蜡的热性能有着深远的影响。本文测量了正二十一烷 + 正二十五烷(C21-C25)和正二十五烷 + 正二十八烷(C25-C28)二元体系的相图。结果表明,随着温度的升高,有序形式被旋转形式所取代,并最终转变为液体。Jeziorny 模型和 Mo 模型被用来描述 C25、C21-C25 和 C25-28 的非等温结晶过程。使用弗里德曼微分等变法分析了正构烷烃非等温结晶过程的有效结晶活化能((\Δ {E}_{\text{m}}\) )。研究发现,C21 和 C28 的添加对成核过程有积极影响;而对生长过程则有消极影响,即对结晶速率有消极的净影响。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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