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US 6,475,960 B1Granted
Premium synthetic lubricants
AssigneeExxonMobil Research and Engineering Company
InventorsPaul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
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AssigneeExxonMobil Research and Engineering Company
InventorsPaul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
Estimating the term…
Premium synthetic lubricants comprise a synthetic isoparaffinic hydrocarbon base stock and an effective amount of at least one, and typically a plurality of lubricant additives such as a detergent, dispersant, antioxidant, antiwear additive, pout point depresant, VI improver and the like. The base stock is derived from a waxy, paraffinic, Fischer-Tropsch synthesized hydrocarbon feed fraction having an initial boiling point in the range of about 650-750° F. and continuously boiling up to at least 1050° F., by a process which comprises hydroisomerizing the feed and dewaxing the isomerate. The waxy feed has a T90−T10 temperature difference of at least 350° F. and is preferably hydroisomerized without any pretreatment, other than optional fractionation. The lubricant may also contain hydrocarbonaceous and synthetic base stock material. Lubricants, such as fully formulated multigrade automotive crankcase and transmission oils formed by adding a suitable additive package to the isoparaffinic base stock have exhibited performance superior to similar fully formulated oils based on both PAO and conventional, petroleum derived base stocks.
A lubricant comprising an isoparaffinic base stock comprising at least 95 wt. % non-cyclic isoparaffins derived from waxy, paraffinic, Fischer-Tropsch synthesized hydrocarbons and an effective amount of at least one lubricant additive.
A lubricating oil comprising an isoparaffinic base stock derived from waxy, paraffinic, Fischer-Tropsch hydrocarbons and an effective amount of at least one lubricating oil additive, wherein said base stock comprises at least 95 wt. % non-cycle isoparaffins having a molecular structure with less than half the branches having two or more carbon atoms and with less than 25% of the total number of carbon atoms present in the branches.
A lubricant comprising an isoparaffinic base stock comprising at least 95 wt. % non-cyclic isoparaffins derived from a waxy, paraffinic hydrocarbon feed produced by a Fischer-Tropsch hydrocarbon synthesis process and an effective amount of at least one lubricant additive, wherein said base stock is produced by a process which comprises hydroisomerizing and dewaxing said waxy feed.
A process for making a lubricant which comprises combining an effective amount of at least one lubricant additive to an isoparaffinic base stock which comprises at least 95 wt. % non-cyclic isoparaffin molecules, wherein said base stock is formed by a process which comprises (i) reacting H2 and CO in the presence of a Fischer-Tropsch hydrocarbon synthesis catalyst in a slurry at reaction conditions effective to form a waxy paraffinic feed having an initial boiling point in the range of 650-750° F. and continuously boiling up an end point of at least 1050° F., and having a T90−T10 temperature difference of at least 350° F., wherein said slurry comprises gas bubbles and said synthesis catalyst in a slurry liquid which comprises hydrocarbon products of said reaction which are liquid at said reaction conditions and which includes said waxy feed fraction (ii) hydroisomerizing said waxy feed to form a hydroisomerate having an initial boiling point between 650-750° F., (iii) dewaxing said 650-750° F.+ hydroisomerate to reduce its pour point and form a 650-750° F.+ dewaxate, and (iv) fractionating said 650-750° F.+ dewaxate to form two or more fractions of different viscosity, recovering said fractions and using at least one of said fractions as said isoparaffinic base stock.
Dependencies are inferred from the claim text.