Ultrafiltration first appeared at the end of the 19th century and was used for a long time as a concentration and purification technique in laboratory preparations. Studies have been carried out to improve the properties of ultrafiltration polymeric membranes; most of them are related to flat sheet membranes prepared by the dry/wet phase inversion process. On the other hand, less researches has been done on the preparation and characterization of hollow fiber membranes. This is due to the fact that the preparation of hollow fiber membranes is much more complex than the former which involves...