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US 6,165,949 AGranted
Premium wear resistant lubricant
AssigneeExxon Research & Engineering Co.
InventorsPaul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
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AssigneeExxon Research & Engineering Co.
InventorsPaul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
Estimating the term…
A premium synthetic lubricant having antiwear properties comprises a synthetic isoparaffinic hydrocarbon base stock and an effective amount of at least one antiwear additive. The antiwear additive is preferably at least one of a metal phosphate, a metal dialkyldithiophosphate, a metal dithiophosphate a metal thiocarbamate, a metal dithiocarbamate, an ethoxylated amine dialkyldithiophosphate and an ethoxylated amine dithiobenzoate. Metal dialkyldithiophosphates are preferred, particularly zincdialkyldithiophosphate (ZDDP). The base stock is derived from a waxy, Fischer-Tropsch synthesized hydrocarbon feed fraction comprising hydrocarbons having an initial boiling point in the range of about 650-750.degree. F., by a process which comprises hydroisomerizing the feed and dewaxing the isomerate. The lubricant may also contain hydrocarbonaceous and synthetic base stock material in admxture with the Fischer-Tropsch derived base stock.
A wear resistant lubricant comprising at least 95 wt % non-cyclic isoparaffins derive from waxy, paraffinic, Fisher-Tropsch synthesized hydrocarbons in admixture with an effective amount of at least one antiwear additive wherein said isoparaffins have a molecular structure wherein less than 25% of the total number of carbon atoms are present in the branches and less than half the branches on the isoparaffinic molecules are methyl branches and wherein said antiwear additive is at least one of a metal phosphate, a metal dithiophosphate, a metal dialkyldithio phosphate, an metal thiocarbamate, a metal dithiocarbamate, an ethoxylated amine dialkyldithiophosphate and an ethoxylate amine dithiobenzoate.
A lubricating oil comprising an isoparaffinic base stock derived from waxy, paraffinic, Fischer-Tropsch hydrocarbons and an effective amount of at least one antiwear additive, wherein said base stock comprises at least 95 wt. % non-cyclic isoparaffins having a relatively linear 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 antiwear additive, wherein said base stock is produced by a process which comprises (i) hydroisomerizing said paraffinic, Fischer-Tropsch synthesized waxy hydrocarbon feed to form a hydroisomerate, (ii) dewaxing said hydroisomerate to reduce its pour point and form a 650-750.degree. F.+ dewaxate, and (iii) fractionating said dewaxate to form two or more fractions of different viscosity, at least one of which comprises said base stock.
A process for making a lubricant having antiwear properties which comprises combining an effective amount of at least one antiwear additive and 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 H.sub.2 and CO in the presence of a Fischer-Tropsch hydrocarbon synthesis catalyst in a slurry at reaction conditions effective to form a waxy feed comprising mostly normal paraffins having an initial boiling point in the range of 650-750.degree. F. and continuously boiling up an end point of at least 1050.degree. F., and having a T.sub.90 -T.sub.10 temperature difference of at least 350.degree. F., wherein said slurry comprises gas bubbles and said synthesis catalyst having a catalytic cobalt component 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 by reacting it with hydrogen in the presence of a hydroisomerization catalyst that has not been treated with a halogen and which comprises a non-noble Group VIII catalytic metal component on an amorphous. acidic support component to form a hydroisomerate having an initial boiling point between 650-750.degree. F., (iii) dewaxing said 650-750.degree. F.+ hydroisomerate to reduce its pour point and form a 650-750.degree. F.+ dewaxate, and (iv) fractionating said 650-750.degree. 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.
A wear resistant lubricant comprising
Dependencies are inferred from the claim text.