Axial dispersion coefficient in high-speed counter-current chromatography.
Experimental measurements of axial dispersion coefficients in high-speed counter-current chromatography have been carried out in the single-phase and two-phase modes. Axial dispersion coefficients were calculated from the residence time distribution curve (or the elution profile). The experimental data obtained were used to develop a model involving Peclet number Pe, Reynolds number and the ratio of flow velocity u to linear angular velocity u(theta) for predicting the axial dispersion coefficient. Furthermore, the models obtained from the single-phase and two-phase modes were compared, and a counterintuitive phenomenon was found in that the effects of the flow rate and the rotation speed on the axial dispersion coefficients are inconsistent: the axial dispersion coefficient decreases with the rotation speed and increases with the flow rate in the single-phase mode, but increases with rotation speed and decreases slightly with the flow rate in the two-phase mode.
Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China.
Chun-Xia
CX
Zhao
Ya-Lan
YL
Xu
Chao-Hong
CH
He
D003377:Countercurrent Distribution / Q000379:methods*; D009930:Organic Chemicals / Q000737:chemistry*; D055585:Physical Phenomena
D009930:Organic Chemicals