Mass transfer coefficients in mixer-settler extraction column
Mass transfer coefficients in mixer-settler extraction column
复制标题
混合沉降器萃取塔中的传质系数
DOI：
10.1252/jcej.30.1083
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发表时间：
1997
影响因子：
0.8
通讯作者：
Katsuroku Takahashi
中科院分区：
文献类型：
--
作者：
S. Nii;Junichiro Suzuki;K. Tani;Katsuroku Takahashi
测定了混合澄清萃取塔中的体积总传质系数Kca和体积分散相传质系数kda。在Kca的测定中，碘从I2-KI水溶液中被萃取到庚烷中，而碘从碘的庚烷溶液中被反萃取到硫代硫酸钠水溶液中，得到kda。通过使用由估计的分散液滴的Sauter平均直径和估计的分散相的滞留率确定的比界面面积，由体积系数Kc a和kda确定分散相和连续相的传质系数。的分散相的系数k d与理论值相吻合的基础上在一个刚性球内的扩散使用的分散液滴的停留时间分布。另一方面，连续相的系数k c与刚性球体周围的传质相关性一致，假设分散液滴到连续相的相对速度由具有相同直径和密度的刚性球体的终端沉降速度给出。
The volumetric over-all mass transfer coefficient K c a and the volumetric dispersed phase mass transfer coefficient k d a in a mixer-settler extraction column were measured. In the measurement of K c a, iodine was extracted from I 2 -KI aqueous solution into heptane, while iodine was back-extracted from a heptane solution of iodine into sodium thiosulfate aqueous solution to obtain k d a. By using specific interfacial area determined from the estimated Sauter mean diameter of the dispersed drops and the estimated holdup of the dispersed phase, the mass transfer coefficients for the dispersed and the continuous phases were determined from the volumetric coefficients K c a and k d a. The coefficient k d for the dispersed phase coincided with the theoretical value based on diffusion within a rigid sphere using the residence time distribution of dispersed drops. On the other hand, the coefficient k c for the continuous phase agreed well with the correlation of mass transfer around a rigid sphere by assuming that the relative velocity of the dispersed drop to the continuous phase was given by the terminal settling velocity of a rigid sphere having the same diameter and density as the drop.