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Catalytic wet oxidation of substituted phenols in the trickle bed reactor

✍ Scribed by Vratislav Tukač; Jiří Hanika

Publisher
Wiley (John Wiley & Sons)
Year
1998
Tongue
English
Weight
257 KB
Volume
71
Category
Article
ISSN
0268-2575

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✦ Synopsis

Continual catalytic wet oxidation of phenol and its derivatives as a suitable chemical pretreatment before a biological treatment process was investigated. The evaluation of (i) the inÑuence of amino-, carboxy-and sulfo-phenol substituents on the course of the oxidation of hydroxyl-aromatics, (ii) the catalytic ability of an active carbon, and (iii) the inÑuence of reaction conditions, viz. temperature (120È160¡C) and oxygen partial pressure (2È5 MPa) in the continuous trickle bed reactor, is presented. The active carbon type catalyst seems to be active enough for phenol oxidation, but it is not so e †ective for aromatic acids. The results of trickle bed operation were strongly inÑuenced by hydrodynamics, viz. wetting efficiency. An insufficient catalyst wetting compensates for an e †ect of residence time in the bed and undesirable Ñuctuation of conversion appears at the low liquid velocities which are typical for waste water treatment processes. It is possible to achieve an optimal value of reactor productivity.

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