在搅拌槽中含惰性颗粒的液液固三相体系的液液传质特性  

Interphase mass transfer of liquid-liquid-solid system i n stirred tank

作　　者：方静[1] 杨超[1] 禹耕之[1] 毛在砂[1] 

机构地区：[1]中国科学院过程工程研究所,北京100080

出　　处：《化工学报》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)~~

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.

关 键 词：液液固体系 相间传质 搅拌槽 电导率 

分 类 号：TQ028.8[化学工程]