Method for improving the demulsibility of base oils

摘要

Lube oil basestocks having an oil/water interfacial tension ((gamma) o/w) of less than 41 mN/m, preferably less than about 35 mN/m which exhibit unacceptable demulsibility can have their demulsibility performance improved by contacting said lube oil basestock with an acidic ion exchange resin, such as Amberlyst AR-15, or with silica. The treated lube oil base stock exhibits an oil/water interfacial tension ((gamma) o/w) of at least about 41 mN/m, preferably at least about 42 mN/m.