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Etude de l’autovaporisation instantanée dans l’intensification de l’extraction de l’huile essentielle du bois de santal

Abstract : This study focuses on fundamental analysis and experimental work carried out on extraction via conventional and innovative processes. The extraction of volatile compounds (essential oils ...) through hydrodistillation or steam distillation as conventional methods is slowed or even blocked because of "the paradoxical process". The latter is due to the coupling of vapor and heat transfers, both directed from the exchange surface towards product core. Only partial vapor transfer by progressive forehead ensures the evolution of the process. The kinetics is so inevitably slow, implying high energy consumption and inducing a high degradation of both extracted and residual material. To face this situation, changing the nature of the transfer is essential. We considered the total pressure gradient instead of the vapor pressure gradient as "driving force". Instant Controlled Pressure Drop DIC was used. Instant releasing of high pressure/high pressure towards a vacuum leads to instant autovaporisation, implying a Darcy-type transfer of vapor within the material to the surrounding medium vacuum. Instant Controlled Pressure Drop (DIC) was investigated, according to the Response surface methodology RSM in order to evaluate the impact of process variables on the extraction and to define the optimal settings. The number of treatment cycles and treatment time were taken as independent parameters. These parameters were appropriated to represent both mechanical and thermal impacts of DIC process. Direct extraction of the essential oil of sandalwood DIC-MP, managed primarily by the number of cycles, regardless of treatment time, is an autovaporization of volatile compounds. This new method was then compared throughout its application to steam distillation. While traditional extraction method requires 140 hours, optimized DIC allowed performing essential oil extraction of sandalwood in only 6 minutes, with substantially similar yields. Finally, environment approach and understanding of the phenomena involved in DIC extraction of essential oils were addressed. By dramatically reducing the treatment time and the energy consumption, DIC is a particularly innovative, exceptionally effective and highly attractive environment-friendly essential oil extraction technique.
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https://tel.archives-ouvertes.fr/tel-01674243
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Tassadit Issaadi-Hamitouche. Etude de l’autovaporisation instantanée dans l’intensification de l’extraction de l’huile essentielle du bois de santal. Génie des procédés. Université de La Rochelle, 2016. Français. ⟨NNT : 2016LAROS017⟩. ⟨tel-01674243⟩

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