Thèse de doctorat en Génie des procédés et environnement
Sous la direction de Henri Delmas.
Soutenue en 2004
à Toulouse, INPT .
Réacteurs à trois phases : A, hydrodynamique et mouillage partiel en lit fixe : B, absorption en colonne à bulles gaz-liquide-liquide
Two investigations on three phase reactors are reported : liquid flow maldistribution and partial wetting of the catalyst in trickle bed reactors, and effects of adding small amounts of organic phase on gas to aqueous phase mass transfer in a bubble column. Radial distribution of the liquid flow is investigated in a 0. 152 m in diameter fixed bed of 5 successive catalysts of various shape and size, and various trickling liquids (water, water+additives, kerosene). A model has been derived based on force balance on each fluid phase and compared to experimental results including previous works. This model was extended to partial wetting, characterised by tracer analysis. In bubble column, oxygen to water mass transer was shown to be highly influenced by adding only 1% oil fraction. 7 organic liquids were used showing more than 300% mass transfer enhancement with alkanes and conversely 50% reduction with more water soluble components, these effects being mainly relatde to bubble size.
Pas de résumé disponible.