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Journal of Sol-Gel Science and Technology
Published in: Journal of Sol-Gel Science and Technology 3/2017

25-07-2017 | Invited Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)

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

Authors: Mouna Lazrag, Edouard Steiner, Cécile Lemaitre, Fabrice Mutelet, Romain Privat, Sabine Rode, Ahmed Hannachi, Danielle Barth

Published in: Journal of Sol-Gel Science and Technology | Issue 3/2017

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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.

Graphical abstract

Thermodynamic study to explain theoretical recovery in organogel supercritical drying: comparison between two solvents (T=20 °C, P=50 bar). https://static-content.springer.com/image/art%3A10.1007%2Fs10971-017-4465-1/MediaObjects/10971_2017_4465_Figa_HTML.gif
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Metadata
Title
Experimental and thermodynamic comparison of the separation of CO2/toluene and CO2/tetralin mixtures in the process of organogel supercritical drying for aerogels production
Authors
Mouna Lazrag
Edouard Steiner
Cécile Lemaitre
Fabrice Mutelet
Romain Privat
Sabine Rode
Ahmed Hannachi
Danielle Barth
Publication date
25-07-2017
Publisher
Springer US
Published in
Journal of Sol-Gel Science and Technology / Issue 3/2017
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-017-4465-1

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