摘要
Volumetric liquid-liquid mass transfer coefficients ( k _La) were determined for liquid-liquid-solid dispersion in a mechanical ly 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 typ ical liquid-liquid extraction system (n-butanol-deionized water-succinic acid) were studied. The experimental results indicated that k_La incre ased in liquid-liquid and liquid-liquid-solid systems when agitation speed in creased. The addition of glass beads enhanced the liquid-liquid mass transfer c oefficients, but PET particles decreased the mass transfer rate. In both liquid -liquid and liquid-liquid-solid systems, the Rushton impeller is the most eff icient 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 so lid phase increased.For the Rushton impeller, k_La showed a minimum for glass beads systems and increased linearly with the increase of clearance for P ET particles.
Volumetric liquid-liquid mass transfer coefficients （kLα） 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 kLα increased in liquid-liquid and liquid-liquid-solid systems when agitation speed increased. The addition of glass beads enhanced the liquidliquid 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, kLα showed a minimum for glass beads systems and increased linearly with the increase of clearance for PET particles.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第8期1479-1483,共5页
CIESC Journal
基金
国家自然科学基金项目(20236050
20106016
20006015)
国家重点基础研究发展规划项目(2004CB217604)~~
关键词
液液固体系
相间传质
搅拌槽
电导率
liquid-liquid-solid system
interphase mass transfer
stirred tank
conductivity
