A model has been developed which predicts the performance of a batch u
ltrafiltration. By using the relationship for flux decline proposed by
Merin and Cheryan in 1990, an analytical solution is presented. The p
roposed model includes the initial volume, feed solution concentration
s, processing time, retention, membrane area and flux across the membr
ane. The model predictions are compared with experimental data, and sa
tisfactory agreement is obtained.