Abstract: Volumetric liquid-liquid mass transfer coefficients (k_La) were determined for liquid-liquid-solid dispersion in a mechanically agitated baffled tank by using a conductivity probe.The effects of agitation speed, inert glass bead or PET particle diameter, type of impeller, impeller-to-bottom clearance, and the solids mass fraction on the mass transfer of the typical liquid-liquid extraction system (n-butanol-deionized water-succinic acid) were studied. The experimental results indicated that k_La increased in liquid-liquid and liquid-liquid-solid systems when agitation speed increased. The addition of glass beads enhanced the liquid-liquid mass transfer coefficients, but PET particles decreased the mass transfer rate. In both liquid-liquid and liquid-liquid-solid systems, the Rushton impeller is the most efficient one for mass transfer. The mass transfer coefficient showed a maximum in glass beads systems but decreased slightly in PET systems as the fraction of solid phase increased.For the Rushton impeller, kLa showed a minimum for glass beads systems and increased linearly with the increase of clearance for PET particles.

Key words: 液液固体系, 相间传质, 搅拌槽, 电导率

关键词: 液液固体系, 相间传质, 搅拌槽, 电导率