Improved Production Method of API Group II Heavy Base Oil

摘要

A method of producing heavy base oil comprising: a. Performing aromatic extraction of a first hydrocarbon feed to produce an aromatic extract and waxy raffinate; b. Mixing the aromatic extract with a second hydrocarbon feed to produce a mixed feed having greater than 2,000 wt. c. Feeding the mixed feed to a hydrotreating unit to produce an API Group II heavy base oil having a kinematic viscosity at 70 C of 22.6 to 100 mm 2 / s. An integrated refinery process unit for producing a heavy base oil, comprising: a. An aromatic extraction unit fluidly connected to the solvent dewaxing unit and the hydrotreating unit; b. A first line from the aromatic extraction unit feeding an aromatic extract to a second hydrocarbon feed to produce a mixed feed with sulfur in excess of 2,000 wt ppm; And c. And a connection to supply the mixed feed to the hydrotreating unit.