Membrane Extraction Through Backward Flow Multipass Rectangular Modules with Modified Correction-Factor Analysis

The expressions of heat- and mass-transfer rates in the multipass heat- and mass-exchangers derived by the conventional correction-factor analysis are implicit and the results should be calculated using try-and-error method. In present study, the modified correction-factor analysis was introduced, and the expressions of mass-transfer rate and modified correction-factor charts for membrane extraction in parallel-flow multipass rectangular devices thus derived, are explicit. The results can be readily calculated without using try-and-error method. The correction factors for multipass operations are plotted in the modified correction-factor charts, they are function of flow rate, mass-transfer-area, distribution coefficient and overall mass-transfer coefficient. Experimental results confirm the predicted values for the extraction of acetic acid from aqueous solution by methyl isobutyl ketone in the double-pass device.