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Experimental and thermodynamic comparison of the separation of CO2/toluene and CO2/tetralin mixtures in the process of organogel supercritical drying for aerogels production

Abstract : An organogel is firstly prepared by synthesizing an aminoacid-type organogelator which is able to immobilize aromatic solvents, such as tetralin or toluene. Aerogels are obtained from organogels by extracting the solvent with a stream of supercritical CO2 in an autoclave. The CO2/solvent mixture leaving the autoclave is separated in a cascade of three cyclone separators. The experimental results showed a good solvent recovery rate in the case of tetralin, exceeding 90%, but an unsatisfactory separation for toluene with a yield below 65%. A thermodynamic study was carried out to model the separation for both solvents. The Peng–Robinson equation of state with van der Waals mixing rules and temperature-dependent binary interaction coefficients was selected to predict the CO2/solvent thermodynamic behavior. Measurements of isothermal bubble points of the CO2/tetralin system were conducted using a high-pressure variable-volume visual cell confirming the relevancy of this model. Then, the first separator was simulated as a simple theoretical equilibrium stage. Simulations using PRO/II software were in good agreement with experimental solvent recovery rate for both toluene and tetralin. The best operating pressure and temperature for the separation were computed by a numerical parametric study.
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https://hal.univ-lorraine.fr/hal-01932511
Contributor : Cecile Lemaitre <>
Submitted on : Friday, November 23, 2018 - 9:57:52 AM
Last modification on : Wednesday, October 14, 2020 - 4:13:34 AM

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Mouna Lazrag, Edouard Steiner, Cécile Lemaitre, Fabrice Mutelet, Romain Privat, et al.. Experimental and thermodynamic comparison of the separation of CO2/toluene and CO2/tetralin mixtures in the process of organogel supercritical drying for aerogels production. Journal of Sol-Gel Science and Technology, Springer Verlag, 2017, 84 (3), pp.453 - 465. ⟨10.1007/s10971-017-4465-1⟩. ⟨hal-01932511⟩

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