Déshydratation de bioéthanol par procédés membranaires : Effet de la présence d’impuretés organiques volatiles sur les transferts de matière

Abstract : This work was aimed to study the performance of a new hydrophilic hallow-fiber and asymmetric polyimide membrane in dehydrating grape marc bioethanol using a vapor permeation pilot-plant. Grape marc bioethanol with variable concentrations in volatile organic compounds (VOC) was used. Concentration in water, ethanol and VOC were determined in permeate and retentate phases in order to calculate membrane selectivity and flux. Mass transfer mechanisms were then analyzed by taking into account the thermodynamic properties of the different molecules and the properties of membrane materials. Results showed that continuous dehydration of grape marc bioethanol up to 0.3% w/w of residual water was possible using the membrane module studied, in conformity with the UE regulation. Moreover, it was shown that this new membrane was able to reduce the amount of methanol in grape marc bioethanol during its dehydration. Taken together with advantages in term of energy consumption and CO2 emission, these promising results highlight the positioning of this membrane process with regard to the traditional techniques used for ethanol dehydration in the world industry (azeotropic distillation, dehydration on molecular sieves). Key words: grape marc bioethanol, dehydration, vapour permeation, selectivity, flux.
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Marwen Moussa, Violaine Athès, Najla Kassaji, Isabelle Souchon. Déshydratation de bioéthanol par procédés membranaires : Effet de la présence d’impuretés organiques volatiles sur les transferts de matière. XIIIe Congrès de la Société Française de Génie des Procédés, Nov 2011, Lille, France. ⟨hal-01627342⟩

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