Supercritical carbon dioxide purification of n-octacosane obtained by chemical synthesis
Résumé
The solubility of n-alkanes in supercritical carbon dioxide are well known in the literature. It is obvious to think that the solubility of diketone is lower than the solubility of n-octacosane. Unfortunately, the solubility of diketone is unknown but there are some data about the solubility of n-octacosane. The value is, for example, 2.18 10-3 (molar fraction) at P = 134.2 bars and at T = 45.4°C. The batch extraction experiments (P = 120 bars, T = 45°C) were realized with a poor quantity of feed, 100 mg, due to the synthesis. The experiments were not so easy because the feed and the solute are solid at atmospheric conditions. We try to optimize the separation and the withdrawn of the solute by using cyclonic separators. The purity of the extract was established by several ways : melting point, calorimetric analysis, gas chromatography, X-ray diffraction and compared with the commercial product.
Domaines
Génie des procédés
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