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Contribution à l'étude des phénomènes d'extraction hydro-thermo-mécanique d'herbes aromatiques : applications généralisées

Abstract : The Controlled Pressure Drop, DIC, is defined as a process of extraction of essential oils; the practicability of the process and the optimization including kinetics and quality for specific cases have been studied. In this work, we try to extent the concept and to better understand processes in order to control the parameters and to generalize the operation. Raw materials studied here concerned the lavandin, the oregano and the rosemary. Besides some physical analyses (density, electronic microscopy,...) of the residual material, the quality of extracts was determined and quantified by Gas Chromatography and Mass Spectrometry to define the molecules present in the extract and to establish the composition of essential oils. The comparison with steam distillation confirm the advantages of DIC in terms of kinetics (several minutes instead of several hours) and of quality (a higher concentration in oxygeneous molecules). We distinguished two processes in the operation DIC: the vaporization at higherthe upper temperatures and shorter times compared with the steam distillation, and the autovaporization exclusively occuring during the pressure drop, which importance depends closely on the degree of instantaneity. The chase of the effort of synthesis, the possibility of fractionated condensation, weak energy consumption, good environmental impact and the promotion of the residual product leading to the extraction of other no volatile molecules will contribute to the good industrialization of the operation.
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Submitted on : Thursday, June 25, 2009 - 4:58:52 PM
Last modification on : Tuesday, February 11, 2020 - 12:36:02 PM
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  • HAL Id : tel-00399135, version 1

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Colette Besombes. Contribution à l'étude des phénomènes d'extraction hydro-thermo-mécanique d'herbes aromatiques : applications généralisées. Génie des procédés. Université de La Rochelle, 2008. Français. ⟨tel-00399135⟩

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