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Communication Dans Un Congrès Année : 2009

Atomistic models of polyamide thin films used for the recycling of water in agrofood industries by reverse osmosis

Roland Kieffer
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Olivier Vitrac
Claire Fargues

Résumé

Distillation of fermented molasses for alcohol and biofuels production uses large volumes of water. Due to environmental concern, the recycling of condensates in the fermentation medium is encouraged subsequently to a purification step. This step could be performed via reverse osmosis (RO) process, in order to remove in the retentate small organic solutes which act as fermentation inhibitors. Currently, no general rule exists to predict the selectivity of RO membranes according to the nature of organic solutes. Similarly, such insights are missing in nanofiltration processes intended to detoxify biomass hydrolysates prior fermentation. Our objective was to build and validate a molecular model of typical reverse osmosis membranes (exemples: ESPA2 and CPA2 from Hydranautics Membranes, USA), consisting in an active aromatic polyamide layer (APA) with different crosslinking rates. These models will be used in future works to develop general models of transport properties (water swelling, solute partitioning mainly) in RO membranes. The main characteristics of commercial RO membranes were retrieved from isolated APA layers (i.e. separated from the polysulfone-polyester support). Geometrical characteristics such as thickness (about 200 nm), homogeneity and swelling rates were assessed with laser ellipsometry and AFM. The composition and the reticulation rate were inferred from FTIR and XPS measurements. The sorption isotherm of water was sampled with an Intelligent Gravimetric Analyzer. The construction strategy of corresponding atomistic models of dried APA membranes via Molecular Dynamics Simulation (Discover, Accelrys, USA) is presented. The described model gives the theoretical density and neutron scattering spectra of simulated APA. These results could be compared in future works with experimental investigations
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Dates et versions

hal-01594503 , version 1 (03-06-2020)

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  • HAL Id : hal-01594503 , version 1
  • PRODINRA : 344470

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Roland Kieffer, Olivier Vitrac, Bernard Rousseau, Claire Fargues, Marie-Laure Lameloise. Atomistic models of polyamide thin films used for the recycling of water in agrofood industries by reverse osmosis. 12ème Congrès de la Société Française de Génie des Procédés (SFGP 2009) "Pour relever les défis industriels du XXIème siècle", Société Française de Génie des Procédés (SFGP). FRA., Oct 2009, Marseille, France. ⟨hal-01594503⟩
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