UPGRADING OF PRE-PROCESSED USED OILS

摘要

Process to further upgrade a pre-processed used lubricating oil by: (a) contacting the partially upgraded used oil in the presence of hydrogen with a hydrodemetallization catalyst, (b) contacting the effluent of step (a) in the presence of hydrogen with a hydrotreating catalyst, (c) contacting the effluent of step (b) in the presence of hydrogen with a dewaxing (d) contacting the effluent of step (c) in the presence of hydrogen with a hydrotreating catalyst.