Etude comparative d'une sélection de membranes de déshydratation de bioéthanol par pervaporation

Abstract : According to the EU regulation EN NF 15376, bioethanol needs to be dehydrated prior to its use as a fuel. Hydrophilic membrane pervaporation is largely described as a promising alternative to molecular sieves and azeotropic distillation, the ordinary techniques for ethanol dehydration. Three major types of pervaporation membranes have been studied in the literature: organic (polymeric) membranes, inorganic membranes and hybrid membranes. Extensive research works have been focused on membrane overall performances (flux and selectivity). However, most of these studies did not systematically distinguish the contribution of the intrinsic parameters, i.e. membrane permeance or permeability (sorption-diffusion through the membrane) from that of driving force in the total flux determined. Moreover, in most cases, experiments were performed using ethanol that has undergone several distillations to remove volatile organic compounds impurities. Ethanol obtained from agricultural residues may contain high amount of volatile impurities. For example, the fermentation of grape marc produces bioethanol that contains methanol and some long chain alcohols. Such impurities can modify the performances of pervaporation membranes. This work aimed to study the performances of four pervaporation membranes: inorganic (Me-Si®), hybrid (Hyb-Si®) and two polymeric (PVA) membranes. These membranes were compared in terms of flux, permeance and selectivity using pure, binary (ethanol+water), ternary (ethanol+water+methanol) and complex (grape marc bioethanol) mixtures. Results show that, for a given membrane, permeance was not constant as often stated in the literature, but varied depending on operating conditions and mixture composition. Emphasis has been put on drag and competition effects involved between molecules. These key phenomena induced changes in membrane permeance and selectivity depending on feed mixture complexity. Keywords : Permeance, Membrane, Pervaporation, Dehydration, Bioethanol
Document type :
Conference papers
Complete list of metadatas

Cited literature [7 references]  Display  Hide  Download

https://hal-agroparistech.archives-ouvertes.fr/hal-01627359
Contributor : Marwen Moussa <>
Submitted on : Wednesday, November 1, 2017 - 11:26:12 AM
Last modification on : Thursday, February 28, 2019 - 5:43:14 PM
Long-term archiving on : Friday, February 2, 2018 - 12:55:01 PM

File

335_Article_MOUSSA et al_2013....
Files produced by the author(s)

Identifiers

  • HAL Id : hal-01627359, version 1

Citation

Marwen Moussa, Pauline Lesage, Isabelle Souchon, Denis Roizard, Eric Favre, et al.. Etude comparative d'une sélection de membranes de déshydratation de bioéthanol par pervaporation. XIVe Congrès de la Société Française de Génie des Procédés, 2013, Lyon, France. pp.2013 ISSN: 1775-335X ; ISBN: 978-2-910239-78-7. ⟨hal-01627359⟩

Share

Metrics

Record views

137

Files downloads

204