PROCESS FOR REFINING WASTE LUBRICATING OIL

摘要

This invention relates to a refining process for waste lubricating oil without condensation step. Waste lubricating oil is treated to remove water and light-oil part, and then is transported to a thin- membrane distiller. In the distiller, the treated oil is distilled to give gas-oil and lubricating oil without condensation step. The distilled lubricating oil is hydrogenated to refine. The distillation temp. is 200-300≦̸C and the pressure is 1.0-1.5 mmHg.