Ozonation of Some Aromatic Compounds in Aqueous Solution: Styrene, Benzaldehyde, Naphthalene, Diethylphthalate, Ethyl and Chloro Benzenes

This study presents the ozonation of some of the aromatic compounds frequently found in French surface waters and which have not been the object of fundamental studies in an aqueous medium. As far as the reactivity is concerned, we have determined the values of the ozone consumed per initial aromatic consumed (molar ratio, ozone demand), in a semi batch bubble column at slightly acidic pH. As for the ozonation products, the application of specific experimental procedures in high concentration aqueous solution after the use of derivatization reactions, allowed us to isolate (PLC, GC) and identify (GC/HS ; MS, NMR) some degradation products in the cases of benzaldehyde and naphthalene. The following of the development, in dilute aqueous solution of some ozonation products (HPLC, GC), is presented in the cases of styrene, benzaldehyde, naphthalene and diethylphthalate. On the basis of the results obtained, the mechanisms of initial steps of ozonation are examined in the case of styrene, of benzaldehyde and of naphthalene. Lastly, with regards to chlorobenzenes and ethylbenzenes, it was not possible to isolate the ozonation products The stripping by ozonated gas of theses compounds became more significant evenof overwhelmingly greatimportance. The results obtained are discussed at the light of the previous results with ozonation of polar aromatic compounds.