Manufacture of lube base stock oil
First Claim
Patent Images
1. In a process for preparing a lube base stock oil from a deasphalted short residuum of a waxy crude, said deasphalted short residuum having a pour point substantially higher than +30°
- F., said process comprising dewaxing said deasphalted short residuum and recovering a dewaxed residuum having a pour point from about -25°
F. to not higher than +30°
F., the improvement, whereby increasing the yield of said dewaxed residuum, which comprises;
catalytically dewaxing said deasphalted short residuum by contact, in the presence of hydrogen, with a dewaxing catalyst contained in a dewaxing zone, said dewaxing catalyst comprising an aluminosilicate zeolite having a silica/alumina ratio of at least about 12 and a Constraint Index of about 1 to about 12, said contacting being at a temperature from 500°
to about 675°
F. and at a hydrogn partial pressure at the reactor inlet of about 150-1500 psia,and cascading the effluent from said dewaxing zone to a hydrotreating zone wherein it is contacted with a hydrotreating catalyst at a temperature of 500°
to 575°
F., thereby increasing the oxidation stability of said dewaxed residuum.
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Abstract
Lube base stock oil of low pour point and excellent stability is produced from a waxy crude oil fraction by solvent refining, catalytic dewaxing over a zeolite catalyst in the nature of zeolite ZSM-5 and hydrotreating under specified conditions.
65 Citations
4 Claims
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1. In a process for preparing a lube base stock oil from a deasphalted short residuum of a waxy crude, said deasphalted short residuum having a pour point substantially higher than +30°
- F., said process comprising dewaxing said deasphalted short residuum and recovering a dewaxed residuum having a pour point from about -25°
F. to not higher than +30°
F., the improvement, whereby increasing the yield of said dewaxed residuum, which comprises;catalytically dewaxing said deasphalted short residuum by contact, in the presence of hydrogen, with a dewaxing catalyst contained in a dewaxing zone, said dewaxing catalyst comprising an aluminosilicate zeolite having a silica/alumina ratio of at least about 12 and a Constraint Index of about 1 to about 12, said contacting being at a temperature from 500°
to about 675°
F. and at a hydrogn partial pressure at the reactor inlet of about 150-1500 psia,and cascading the effluent from said dewaxing zone to a hydrotreating zone wherein it is contacted with a hydrotreating catalyst at a temperature of 500°
to 575°
F., thereby increasing the oxidation stability of said dewaxed residuum. - View Dependent Claims (2, 3, 4)
- F., said process comprising dewaxing said deasphalted short residuum and recovering a dewaxed residuum having a pour point from about -25°
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Current AssigneeMobil Oil Corporation (Exxon Mobil Corporation)
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Original AssigneeMobil Oil Corporation (Exxon Mobil Corporation)
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InventorsSarli, Michael S., Smith, Kenneth W., Gillespie, Bernard M.
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Primary Examiner(s)Gantz, Delbert E.
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Assistant Examiner(s)Schmitkons, George
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Application NumberUS06/430,180Time in Patent Office537 DaysField of Search208/111, 208/18, 208/58, 208/86, 208/87, 208/97US Class Current208/87CPC Class CodesC10G 2400/12 Electrical isolation oilC10G 45/64 containing crystalline alum...
