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Eco-extraction par micro-ondes couplée à un champ centrifuge

Abstract : Current environmental concerns such as the depletion of fossil fuels, the emission of greenhouse gases or global warming are forcing industry to reduce their impact on the environment and to be part of a greener approach. In the field of extraction, this has led, for some years now, to the development of innovative techniques to replace current processes using petroleum-based and energy-intensive solvents. The aim of this thesis was therefore to research and develop a new green extraction process for plant products, thanks to the combination of a thermal effect (microwave heating) and an effect mechanical (centrifugal force). The extraction is carried out directly on the fresh vegetable matrix, the intracellular water of the plant acting as the extracting solvent.The first part of this manuscript will present the experimental pilot at the semi-industrial scale combining microwaves and centrifugation and its potential adaptation for the field of green extraction.In the second part, the tests carried out using this pilot have been described for the extraction of selected secondary metabolites. The results, obtained on “model” products such as salad and orange peel, highlight that this pilot is operational for the extraction of certain micronutrients. In addition, the use of a centrifugation combined with the application of microwaves makes it possible to intensify the extraction yield and a saving of time. Nevertheless, questions about the understanding of the aeraulic system and the distribution of the temperature field during extraction are raised to fully control all extraction parameters.Finally, this process appears as a real innovation in the field of extraction and is very promising because it
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Alice Angoy. Eco-extraction par micro-ondes couplée à un champ centrifuge. Autre. Université d'Avignon, 2019. Français. ⟨NNT : 2019AVIG0274⟩. ⟨tel-02535590⟩

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