Temperatures and Enthalpies of Solid−Solid and Melting Transitions of the Odd-Numbered n- Alkanes C 21 , C 23 , C 25 , C 27 , and C 29
| Autor: | Virginie Chevallier, Mohammed Bouroukba, Michel Dirand, Danielle Barth, Paul Dupuis, Dominique Petitjean |
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| Přispěvatelé: | Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Lorraine (INPL), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU) |
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
N alkanes
Supercritical carbon dioxide Chemistry General Chemical Engineering Extraction (chemistry) Analytical chemistry Thermodynamics 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences [SPI]Engineering Sciences [physics] Differential scanning calorimetry Impurity [CHIM]Chemical Sciences 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Chemical and Engineering Data Journal of Chemical and Engineering Data, 2001, 46 (5), pp.1114-1122. ⟨10.1021/je0003501⟩ Journal of Chemical and Engineering Data, American Chemical Society, 2001, 46 (5), pp.1114-1122. ⟨10.1021/je0003501⟩ |
| ISSN: | 0021-9568 1520-5134 |
| DOI: | 10.1021/je0003501⟩ |
| Popis: | Very high purity samples of normal pentacosane and heptacosane are made by synthesis: the procedures for the C 25 and C 27 synthesis and the original conditions of their purification, particularly using the extraction by supercritical carbon dioxide, are described. Measurements of temperatures and enthalpies of the solid-solid transitions and of the melting transition were carried out by differential scanning calorimetry on the C 25 and C 27 synthetic samples and the odd-numbered homologous n-alkanes (from C 21 to C 29 ). The results show the importance of the effect of the impurities, particularly for the δ and y crystal-crystal transition temperatures of C 25 and C 27 . Several current data of the literature are also shown concerning the temperatures and the enthalpies of solid-solid and melting transitions of these five n-alkanes. |
| Databáze: | OpenAIRE |
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