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 mm 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.
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 mm 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.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2005年第2期125-130,共6页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20236050
20006015)
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
agitated vessel
conductivity
