Étude de la perméation du Toluène et du n-Heptane dans des réseaux polaires orginaux de type polyuréthane : application à leur séparation par pervaporation

Abstract : The understanding of physicochemical interactions which can exist between chemical species such as solvents and polymers are usually the key of the implementation of the corresponding polymers in innovative processes such as elaboration of selective film polymers. Used in pervaporation, a physicochemical method of separation, suited materials could allow the separation of non polar mixtures such as aromatic/alkane which are known to be difficult to separate. This problem has been studied in this work with a model mixture : toluene/n-heptane. From literature data, physicochemical interactions which enable favourable extraction of an aromatic compound from an aliphatic one have been pointed out. Crosslinked polyurethanes have been prepared in order to use them in pervaporation. The synthesis of those polymers with evolutive structure has been performed to control to the best, the chemical architecture of those materials. The transport properties of binary and ternary systems have been investigated based on sorption, diffusion and pervaporation measurements in order to determine the respective contribution of the two major elementary phenomena involved in pervaporation. In the case of the ternary systems, materials showed high selectivities for toluene while they have no affinity towards nheptane. The study of this elementary step supported a sorption synergy phenomenon. The differential permeation in transitory regime showed that toluene diffused moderately faster than n-heptane for all binary systems studied. The pervaporative transport characterization allowed to establish that when the sorption step is predominant for permselectivity of toluene, the diffusion selectivity is inverted with regard to the observations made for binary systems. In other respects, some of the polyurethanes synthesised exhibit interesting separation properties close to those required for an industrial application.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_1999_NILLY_A.pdf
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https://hal.univ-lorraine.fr/tel-01750606
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Submitted on : Thursday, March 29, 2018 - 12:50:21 PM
Last modification on : Tuesday, July 24, 2018 - 4:42:55 PM

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  • HAL Id : tel-01750606, version 1

Citation

Alexandra Nilly. Étude de la perméation du Toluène et du n-Heptane dans des réseaux polaires orginaux de type polyuréthane : application à leur séparation par pervaporation. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL114N⟩. ⟨tel-01750606⟩

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