In this study, the pervaporative dehydration of cutting oil ‘diethylene glycol’ (DEG) through a hydrophilic PVA membrane was investigated at various operation temperatures in the range of 333–363 K with feed mixture containing 0.5–2.0 wt % water. The pervaporation (PV) performance of poly (vinyl alcohol) (PVA) is enhanced by the addition of natural clay kaolin into the pristine membrane. The thermal stability of membranes was analyzed by thermal gravimetric analysis (TGA). The morphological analysis of membranes was performed by scanning electron microscope (SEM). Separation success was determined by calculation of flux, selectivity, and PSI. These values were investigated as functions of the clay amount, feed concentration and feed temperature. The obtained results show that PV is an effective method for recycling waste cutting oil from wastewater.