INTEGRATED HYDROTREATING HYDRODEWAXING HYDROFINISHING PROCESS

摘要

Provided is a three stage hydroprocessing process for producing lubricant base stocks with a stripping/separating zone between the first two hydroprocessing zones and a separating zone following the third hydroprocessing zone. The stripping/separating zone occurs at high pressure and temperature with no disengagement between or following the hydroprocessing zones and without the use of a liquid pump prior to the second hydroprocessing zone. The process pressure is greatest at the entrance to the first hydroprocessing zone. There is also recycle of compressed gaseous effluent from the last separating zone to the stripping zone, the first hydroprocessing zone, the second hydroprocessing zone, and/or the third hydroprocessing zone.