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Using ozone for VOCs removal in a new hybrid process

Manero, Marie-Hélène and Monneyron, Pierre and Mathé, Stéphane Using ozone for VOCs removal in a new hybrid process. (2005) In: 17th Ozone Wold Congress, 2005, 22-25 Aug 2005, Strasbourg, France .

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Adsorption is one of the main technique available for Volatile Organic Compounds (VOCs) removal from airstreams. Usually, a continuous flow treatment leads to two parallel contactors : on the first one adsorption is obtained during a few hours while regeneration of the adsorbent is conducted on the second one, by a costly thermal desorption. In this study, an alternative technique for industrial airstreams contaminated with VOCs is examined. This process uses High-Silica Zeolites (HSZ) as adsorbent and regeneration is realized by oxidation with ozonated air. Both adsorption and regeneration take place in a single reactor. Interactions between gaseous compounds, ozone or VOCs, and siliceous molecular sieve adsorbents were studied. In previous works, we showed that selective adsorption behavior can be quantitatively predicted using thermodynamic models. In our procedure, ozonated air flows in contact with two hydrophobic zeolites: a dealuminated faujasite Y (FauY) and a ZSM-5 type silicalite (SilZ). Two different phenomenon occurred: -on Fau Y, ozone is decomposed on silanol groups induced by the desalumination step, -on Silicalite, ozone is physically adsorbed in microporous porosity with a type I isotherm. Furthermore, the adsorption properties of HSZ – in terms of capacity and selectivity toward a solvent mixture – were not significantly modified by the contact with gaseous ozone. Ozonation of two daily used industrial solvents as model VOC, was then achieved on both zeolites. Gaseous Methyl Ethyl Ketone (MEK) and Toluene (TOL), chosen as standard compounds, do not react with ozone in air stream. Therefore, our study focused on the oxidation of organic compounds by ozone when they are adsorbed. Total regeneration of the fixed bed saturated with VOC was completed with a typical gaseous ozone concentration of 18 g.m-3. Moreover total mineralization of organic compounds was achieved. Detection and identification of sub-products traces using mass spectrometer allowed us to expect oxidation reactive species. In addition, a mass balance on oxygen showed that all the inlet ozone was used for organic compounds oxidation.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Other partners > Ecole Nationale Supérieure de Chimie et de Physique de Bordeaux - ENSCPB (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Université de Bordeaux 1 (FRANCE)
Laboratory name:
Deposited On:14 Nov 2008 09:39

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