Premium synthetic lubricant base stock having at least 95% non-cyclic isoparaffins
AssigneeExxonMobil Research and Engineering Company
InventorsPaul J. Berlowitz, Jacob J. Habeeb, Robert J. Wittenbrink
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Abstract
A premium synthetic lubricating oil base stock having a high VI and low pour point is made by hydroisomerizing a Fischer-Tropsch synthesized waxy, paraffinic feed wax and then dewaxing the hydroisomerate to form a 650-750.degree. F.+ dewaxate. The waxy feed has an initial boiling point in the range of about 650-750.degree. F., from which it continuously boils up to at least 1050.degree. F. and has a T.sub.90 -T.sub.10 temperature difference of at least 350.degree. F. The feed is preferably hydroisomerized without any pretreatment, other than optional fractionation. The 650-750.degree. F.+ dewaxate is fractionated into two or more base stocks of different viscosity.
Claims8
A lubricant base stock comprising at least 95 wt. % non-cyclic isoparaffins having a molecular structure in which less than 25% of the total number of carbon atoms of the isoparaffin structure are contained in the branches and less than half of the total isoparaffin branches contain two or more carbon atoms.
Dependencies are inferred from the claim text.