Upgrading of pre-processed used oils

Details Upgrading of pre-processed used oils Upgrading of pre-processed used oils

2007-08-28

2007-08-28

Caldarola, Glenn (Department: 1764)

Mineral oils: processes and products

Refining

Purifying used oil

C208S028000, C208S059000, C208S211000, C208S212000, C208S25100H

Reexamination Certificate

active

10492720

ABSTRACT:
A 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 catalyst; and(d) contacting the effluent of step (c) in the presence of hydrogen with a hydrotreating catalyst.

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