US 5,393,408 A · Process for the stabilization of lubricating oil base stocks

Abstract

A process is disclosed for producing a hydrogenated lubricating oil base stock having improved stability. A lube oil base stock is contacted with hydrogen in a first hydrogenation zone under hydrogenation reaction conditions in the presence of a macroporous hydrogenation catalyst comprised of a particulate refractory inorganic oxide support component and a hydrogenation component. The macroporous hydrogenation catalyst has an acid site density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst, a total pore volume greater than about 0.45 cm.sup.3 /g, and at least 10% of the total pore volume in macropores of diameter is greater than about 1000 Angstroms. A portion of the effluent from the first step is then contacted with hydrogen in a second hydrogenation zone under hydrogenation reaction conditions in the presence of a mesoporous hydrogenation catalyst comprised of a particulate refractory inorganic oxide support component and a hydrogenation component. The catalyst has an acid side density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst, a total pore volume greater than about 0.30 cm.sup.3 /g, and has less that 10% of the total pore volume in macropores of diameter greater than about 1000 Angstroms. A lube oil base stock is then recovered which has improved stability.

Claims40

Dependent claims

A process for producing a hydrogenated lubricating oil base stock having improved stability comprising the steps of:

(a) contacting the lubricating oil base stock with hydrogen in a first hydrogenation zone under hydrogenation reaction conditions in the presence of a macroporous hydrogenation catalyst comprising a particulate refractory inorganic oxide support component and a hydrogenation component, said macroporous hydrogenation catalyst having
(i) an acid site density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst;
(ii) a total pore volume greater than about 0.45 cm.sup.3 /g;
and
(iii) at least 10% of the total pore volume being in macropores of diameter greater than about 1000 Angstroms;
(b) contacting at least a portion of the effluent from step (a) with hydrogen in a second hydrogenation zone under hydrogenation reaction conditions in the presence of a mesoporous hydrogenation catalyst comprising a particulate refractory inorganic oxide support component and a hydrogenation component, said mesoporous hydrogenation catalyst having
(i) an acid site density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst;
(ii) a total pore volume greater than about 0.30 cm.sub.3 /g;
and
(iii) less than 10% of the total pore volume being in macropores of diameter greater than about 1000 Angstroms;
and
(c) recovering a hydrogenated lubricating oil base stock having improved stability.

9 more elements

A process for producing a hydrogenated lubricating oil base stock having improved stability comprising the steps of:

(a) contacting the lubricating oil base stock with hydrogen in a first hydrogenation zone under hydrogenation reaction conditions in the presence of a mesoporous hydrogenation catalyst comprising a particulate refractory inorganic oxide support component and a hydrogenation component, said mesoporous hydrogenation catalyst having
(i) an acid site density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst;
(ii) a total pore volume greater than about 0.30 cm.sup.3 /g;
and
(iii) less than 10% of the total pore volume being in macropores of diameter greater than about 1000 Angstroms;
(b) contacting at least a portion of the effluent from step (a) with hydrogen in a second hydrogenation zone under hydrogenation reaction conditions in the presence of a macroporous hydrogenation catalyst comprising a particulate refractory inorganic oxide support component and a hydrogenation component, said macroporous hydrogenation catalyst having
(i) an acid site density of between about 0.015 and about 0.3 milliequivalents per gram of catalyst;
(ii) a total pore volume greater than about 0.45 cm.sup.3 /g;
and
(iii) at least 10% of the total pore volume being in macropores of diameter greater than about 1000 Angstroms;
and
(c) recovering a hydrogenated lubricating oil base stock having improved stability.

9 more elements

Dependencies are inferred from the claim text.

Process for the stabilization of lubricating oil base stocks

Life of this patent

Process for the stabilization of lubricating oil base stocks

Life of this patent

Abstract

Claims40