Process for hydrodesulfurizing and hydrotreating lubricating oils from sulfur-containing stock

Claim 2

A PROCESS WHICH COMPRISES CONTACTING A SUBSTANTIALLY ASPHALIC-FREE LUBERATING OIL FEED BOILING COMPLETELY ABOVE 650*F. AND CONTAINING AT LEST 2.0 WEIGHT PERCENT SULFUR WITH A CATALYST COMPOSITION IN A HYDRODESULFURIZATION ZONE UNDER HYDRODESULFURIZATION CONDITIONS TO INCLUDE A HYDROGEN PARTIAL PRESSURE IN THE RANGE FROM ABOUT 200 TO 2000PSI, TE HYDRODESULFURIZATION CATALYST COMPOSITION COMPRISING AT LEAST ONE GROUP VI-B HYDROGENATION METAL, OXIDE OR SULFIDE THEREOF AND AT LEAST ONE GROUP VIII HYDROGENATION METAL, OXIDE OR SULFIDE THEREOF OR ALUMINA SUPPORT, THE TOTAL CONCENTRATION OF HYDROGENETION METALS IN SAID HYDRODESULFURIZATION CATALYST COMPOSITION BEING IN THE RANGE OF 5.0 T 15.0 WEIGHT PERCENT, CONTACTING THE PRODUCT OF SAID HYDRODESULFURIZATION STEP CONTAINING FROM 0.15 TO 1.0 PERCENT SULFUR WITH A HYDROTREATING CATALYST COMPOSITION IN A HYDROTREATING ZONE UNDER HYDROTREATING CONDITIONS TO INCLUDE A HYDROGEN PARTIAL PRESSURE IN THE RANGE FROM ABOUT 2200 TO ABOUT 10,000 PSI, THE HYDROTREATING CATALYST COMPOSITION COMPRISING AT LEAST ONE HYDROGENATION METAL OR SULFIDE THEREOF SELECTED FROM GROUP VI-B METALS AND AT LEAST ONE HYDROGENERATION METAL OR SULFIDE THEREOF SELECTED FROM GROUP VIII METALS ON A SUPPORT SELECTED FROM THE GROUP CONSISTING OF ALUMINA AND SILICA-ALUMINA, THE TOTAL CONCENTRATION OF SAID HYDROGENATION METALS IN SAID HYDROTREATING CATALYST COMPOSITION BEING AT LEAST 20 WEIGHT PERCENT, AND RECOVERING THEREFROM A SUBSTANTIALLY SULFUR-FREE LUBRICATING OIL PRODUCT OF REDUCED AROMATICS CONCENTRATION AND INCREASED VICOSITY INDEX.

Claim 3

The process of claim 1 wherein the temperature maintained in the hydrodesulfurization zone is in the range from about 600* to about 900*F. and the temperature in said hydrotreating zone is maintained in the range from about 700* to about 850*F.

Claim 4

The process of claim 2 wherein the catalyst in the hydrodesulfurization zone comprises nickel, cobalt, molybdenum and an alumina support.

Claim 5

The process of claim 3 wherein the catalyst in the hydrotreating zone comprises nickel, tungsten, fluorine and a silica-alumina support.

Claim 6

A process which comprises contacting a substantially asphaltic-free 650*F. + lubricating oil feed containing at least 2.0 weight percent sulfur with a catalyst composition comprising at least one Group VI-B hydrogenation metal, oxide or sulfide thereof and at least one Group VIII hydrogenation metal, oxide or sulfide thereof on alumina support, the total concentration of said hydrogenation metals in said hydrodesulfurization catalyst composition being in the range of 5.0 to 15.0 weight percent, in a hydrodesulfurization zone under hydrodesulfurization conditions to include a hydrogen partial pressure in the range from about 200 to about 2000 psi, passing an effluent mixture from said hydrodesulfurization zone to a first separation zone, separating the hydrogen sulfide from a gaseous phase withdrawn from said first separation zone, and recycling said gaseous phase substantially free of hydrogen sulfide to said hydrodesulfurization zone, passing a liquid lubricating oil from said first separation zone to a hydrotreating zone, contacting said oil from said hydrodesulfurization step containing from 0.15 to 1.0 weight percent sulfur with a hydrotreating catalyst composition comprising at least one hydrogenation metal or sulfide thereof selected from Group VI-B metals and at least one hydrogenation metal or sulfide thereof selected from Group VIII metals on a support selected from the group consisting of alumina and silica-alumina, the total concentration of said hydrogenation metals in said hydrotreating catalyst composition being at least 20 weight percent, said contacting being carried out in said hydrotreating zone under hydrotreating conditions to include a hydrogen partial pressure in the range of about 2200 to about 10, 000 psi, passing an effluent mixture from said hydrotreating zone to a second separation zone, withdrawing a liquid lubricating oil product from said second separation zone, recycling a first portion of the gaseous phase withdrawn from said second separation zone to said hydrotreating zone, and passing a second portion of the gaseous phase withdrawn from said second separation zone to said hydrodesulfurization zone.

Claim 7

A process which comprises contacting a substantially asphaltic-free 650*F. + lubricating oil feed containing at least 2.0 weight percent sulfur with a catalyst composition comprising at least one Group VI-B hydrogenation metal, oxide or sulfide thereof and at least one Group VIII hydrogenation metal, oxide or sulfide thereof on alumina support, the total concentration of said hydrogenation metals in said hydrodesulfurization catalyst composition being in the range of 5.0 to 15.0 weight percent, in a hydrodesulfurization zone under hydrodesulfurization conditions to include a hydrogen partial pressure in the range from about 200 to about 2000 psi, passing an effluent mixture from said hydrodesulfurization zone to a first separation zone, separating the hydrogen sulfide from a gaseous phase withdrawn from said first separation zone, and recycling said gaseous phase substantially free of hydrogen sulfide to said hydrodesulfurization zone, passing a liquid lubricating oil from said first separation zone to a hydrotreating zone, contacting said oil from said hydrodesulfurization step containing from 0.15 to 1.0 weight percent sulfur with a hydrotreating catalyst composition comprising at least one hydrogenation metal or sulfide thereof selected from Group VI-B metals and at least one hydrogenation metal or sulfide thereof selected from Group VIII metals on a support selected from the group consisting of alumina and silica-alumina, the total concentration of said hydrogenation metals in said hydrotreating catalyst composition being at least 20 weight percent, said contacting being carried out in said hydrotreating zone under hydrotreating conditions to include a hydrogen partial pressure in the range of about 2200 to about 10, 000 psi, passing an effluent mixture from said hydrotreating zone to a second separation zone, withdrawing a liquid lubricating oil product from said second separation zone, recycling a first portion of the gaseous phase withdrawn from said second separation zone to said hydrotreating zone, and passing a second portion of the gaseous phase withdrawn from said second separation zone to said hydrodesulfurization zone.

Claim 8

The process of claim 5 wherein the temperature maintained in the hydrodesulfurization zone is in the range from about 600* to about 900*F. and the temperature in said hydrotreating zone is maintained in the range from about 700* to about 850*F.

Claim 9

The process of claim 6 wherein the catalyst in the hydrodesulfurization zone comprises nickel, cobalt, molybdenum and an alumina support.

Claim 10

The process of claim 7 wherein the catalyst in the hydrotreating zone comprises nickel, tungsten, fluorine and a silica-alumina support.