Re-refining of used lubricating oil by vacuum distillation/thin wiped film evaporation technique

Re-refining of used lubricating oil has appeared as a valuable technique to re-refining of used engine and industrial oils. This paper focused on the vacuum distillation thin wiped film evaporation technique of used lubricating oil recycling. The whole process consists of dehydration, gas oil evaporation, thin wiped film evaporation and clay treatment. The produced base oils are in group I through determination of sulfur contents, percentage of saturate compounds and viscosity indexes. The obtained results are practicable with most of the American Society for Testing and Materials (ASTM) properties and reduced most of worn metals in the refined base oils.