Abstract: A new separator used to remove dispersive oil droplets from oil-in-water mixture was developed with in clined corrugate plates as packing. The flow pattern in this construction gave rise to more frequent collisions between droplets, and catchment of droplets on the packing, thus resulting in high separation efficiency. A mathematical model based on three hypothese for the separation of oil droplets from oil-in-water mixture was developed. The calculated values were in good agreement with the experimental results.