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›› 2005, Vol. 5 ›› Issue (2): 125-130.

• 流动与传递 • 上一篇    下一篇

搅拌槽中液-液-固三相传质的实验研究

方静,杨超,禹耕之,毛在砂   

  1. 中国科学院过程工程研究所
  • 出版日期:2005-04-20 发布日期:2005-04-20

Preliminary Investigation on Interphase Mass Transfer in Agitated

FANG Jing,YANG Chao,YU Geng-zhi,MAO Zai-sha   

  1. Institute of Process Engineering, Chinese Academy of Sciences
  • Online:2005-04-20 Published:2005-04-20

摘要: 选择欧洲化学工程师协会(EFCE)推荐的典型液-液萃取体系正丁醇-丁二酸-水,加入不同粒径的玻璃珠构成液-液-固三相传质,以去离子水为连续相,正丁醇为分散相,溶质丁二酸从分散相向连续相传质. 利用电导率法测定液-液相传质系数,并考察了搅拌转速、固体质量百分含量、不同桨型(标准Rushton桨、上推式和下推式45°六折叶涡轮桨)、桨中心平面距槽底距离以及固体颗粒粒径对相间传质的影响. 结果表明,在高转速时,惰性固体粒子的存在强化液-液体系的传质. 随着惰性固体含量增大,液-液-固三相传质有一极大值. 粒径大于100 μm 的固体粒子对液-液体系传质系数影响很小. 三种桨中Rushton桨的对流传质效果最好.

关键词: 液-液-固体系, 相间传质, 搅拌槽, 电导率

Abstract: Volumetric mass transfer coefficients were determined for liquid-liquid-solid dispersion in a mechanically agitated baffled tank with internal diameter D=0.118 m. The effects of agitation speed (210~460 r/min), inert glass beads diameter (74~355 μm in size), type of impeller (Rushton, PTU, PTD), impeller-to-bottom distance (D/6, D/4, D/3), mass fraction of inert glass particles (<2%) on the mass transfer of typical liquid-liquid extraction system n-butanol-deionized water-succinic acid were examined. The data were collected on-line using a conductivity probe and processed with a PC computer. The mass transfer coefficients of liquid-liquid and liquid-liquid-solid systems were compared under the same operation conditions. It is revealed that the presence of a solid phase enhances the interphase mass transfer. The experimental results are discussed in light of hydrodynamics in stirred tanks.

Key words: liquid liquid solid system, interphase mass transfer, agitated vessel, conductivity