Prediction of Effective Diffusion Coefficient in Rotating Disc Columns and Application in Design

• Published in: Chinese journal of chemical engineering Vol. 17; no. 3; pp. 366 - 372
• Main Authors: Amanabadi, Marzieh, Bahmanyar, Hossein, Zarkeshan, Zohreh, Mousavian, Mohamad Ali
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2009
• Subjects: effective diffusion coefficient; liquid-liquid extraction; mass transfer coefficient; rotating disc column; 刚果民主共和国; 旋转盘; 有效扩散系数; 测定实验; 索特平均直径; effective diffusion coefficient; mass transfer coefficient; liquid-liquid extraction; rotating disc column
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(08)60218-9

A rotating disc column （RDC） with inner diameter 68 mm and 28 compartments is used in this study. Parameters including Sauter mean diameter, hold-up and mass transfer coefficient are measured experimentally un-der different operating conditions. The correlations in literature for molecular diffusion and enhancement factor equation including eddy diffusion, circulation and oscillation of drops are evaluated. A new equation for the effec-tive diffusion coefficient as a function of Reynolds number is proposed. The calculated values of mass transfer co-efficient and column height from the previous equations and present equation are compared with the experimental data. The results from the present equation are in very good agreement with the experimental results, which may be used in designing RDC columns.