| Packed Column used in Extraction(PCE) has been used widely in chemical industry and environmental engineering. Recent years, the research and application of PCE has been intensified because of the development of new-type packings and the improvement of capacity and efficiency of PCE.The Conjugate Ring is a new-type and high-efficiency packing developed by Chemical Engineering Research Institute of SCUT. The performance of φ 16 mm Conjugate Ring and traditional packing, including Pall Ring, Rashing Ring and θ Ring in a φ 120 mm liquid-liquid extraction column was studied and compared. The experimental results for two systems, butanol-succinic-water and 30%(TBP) kerosene-acetic acid-water, show that Conjugate Ring's dispersed holdup fraction is less than that of Pall Ring, Rashing and θ Ring at the same two phase velocities. The Conjugate Ring's flooding velocity is bigger than that of Pall Ring, Rashing Ring and θ Ring at the same one phase velocity, and increases by 20%, 25%, and 30%, respectively. The relationship between two phase velocity and dispersed phase holdup fraction for the four packings was correlated by Godfrey's correlation, while the four packings's flooding velocity was correlated by Laddha and Venkataraman's correlation. Height of mass transfer unit based on plug flow and continuos flow(Hoxp) at the same two phase velocity show that Conjugate Ring's Hoxp is bigger than θ Ring's Hoxp but less than Pall Ring's and Rashing Ring's Hoxp at a rate of 16% and 25%, respectively.A modified diffusion model was proposed on the basis of characteristics of packed column, experimental phenomena and data analysis. The experimental data was processed by using Lagrange Interpolation Formula and the backmixing parameter...
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