{"title":"Solid–liquid equilibria and non-isothermal crystallization kinetics of n-alkanes binary systems","authors":"Chang Li, Luguang Qi, Peng Shi, Zhenxing Zhu, Chuang Xie","doi":"10.1007/s10973-024-13571-0","DOIUrl":null,"url":null,"abstract":"<p>Paraffin wax containing <i>n</i>-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 <i>n</i>-heneicosane + <i>n</i>-pentacosane (C21-C25) and <i>n</i>-pentacosane + <i>n</i>-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 (<span>\\(\\Delta {E}_{\\text{m}}\\)</span>) for the non-isothermal crystallization process of <i>n</i>-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.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":3.0000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Thermal Analysis and Calorimetry","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s10973-024-13571-0","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
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.
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.