کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10273616 | 461284 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermodynamic and structural analyses of the solid phases in multi-alkane mixtures similar to petroleum cuts at ambient temperature
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Structural analyses were carried out by X-ray diffraction, at ambient temperature, on multi-alkane samples whose mole fraction distribution shows a shape of the 'exponential decreasing' type, as observed in petroleum cuts. Nine samples, whose normal-alkane number varies from 15 to 23, have been studied with mole fraction continuous distributions of normal-alkanes going from C22-C36 to C14-C36: each mixture differs from the previous sample by the addition of a lighter n-alkane. At the solid state, the multi-alkane solid samples C22-C36 and C21-C36 are two-phase, C20-C36 to C15-C36, three-phase, and the broader distribution C14-C36, four-phase. In these polyphase solid systems, whose heaviest n-alkane is always C36, the average composition of the heavy and middle phases are constant and their structure are isostructural to the βⲠordered intermediate solid solution, observed in n-alkane binary or ternary molecular alloys; the mean carbon atom number of the light phase decreases as the global average carbon atom number of the synthetic mixtures in relation to the addition of light n-alkanes and its structure simultaneously evolves from the βⲠordered intermediate solid solution towards the β-RI(Fmmm) and the αâRII(R3¯m) disordered solid solutions, observed in pure n-alkanes: the light n-alkane added between each distribution intercalates itself into the structure whose molecule stacking period (thickness) is compatible with its own carbon chain length, in order to reduce the molecular gaps.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 84, Issue 9, June 2005, Pages 1066-1073
Journal: Fuel - Volume 84, Issue 9, June 2005, Pages 1066-1073
نویسندگان
Anne-Julie Briard, Mohammed Bouroukba, Dominique Petitjean, Nathalie Hubert, Jean-Charles Moïse, Michel Dirand,