Modeling of Sequential Batch Ultrafiltration of Red Beet Extract

Sequential batch ultrafiltration of red beet extract was studied by employing membranes of decreasing molecular weight cut‐off in sequence. A mathematical model was developed after considering the series of resistances of the polarized layer and the membrane, but not polymer solution interaction. Experimental data indicated that Sperry's type of expression which has been used to describe wine filtration was also valid for ultrafiltration. The data also revealed that in a special case of operation, when polarized layer resistance is considerably smaller than that of the membrane, the model reduces to a Darcy's law type of expression which is widely used in ultrafiltration.