Abstract
Abstract A commercial polyvinyl alcohol (PVA)/polyacrylonitrile (PAN) hybrid membrane (B3 membrane) was tested to evaluate its ability to dehydrate waste cutting oil by pervaporation (PV). The major material and the water content of the waste cutting oil were analyzed by TGA, NMR, and Karl Fisher titrator. A preliminary PV experiment that involved treatment with 15 wt% aqueous diethylene glycol (DEG) was carried out at various temperatures, and 85 °C was found to be the optimal temperature. The separation factor increased from around 530 to 1140 and the total flux decreased from approximately 0.88 to 0.01 kg/m2/h as the water concentration in the feed solution decreased. Then, a PV experiment that involved treating the waste cutting oil was carried out at 85 °C and the obtained results were almost the same as those in the preliminary experiment, indicating that PV is an effective method for recycling waste cutting oil.
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