As we know, distillation to base oil is under high vacuum. Continuous distillation is not suitable which can lead to oil foaming and leakage of waste oil. While batch type is low efficient and power-waste. So efficient vacuum distillation equipment adopts high speed centrifuge to separate particals and water from the oil; thin-film evaporator for light oil separation; and then high vacuum distillation is delicated to distill oil to base oil. Step1 to step3 are working simultaneously. It’s high efficient and with separate condensers to ensure the purity.