High VI lubricant blends from slack wax
AssigneeMobil Oil Corporation
InventorsJ. Scott Buchanan, Margaret M. Wu
Life of this patent
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Abstract
Lubricant compositions comprise blends or mixtures of low viscosity, 3-8 cS e.g. about 5 cS(100.degree. C.), HVI lube basestock with higher viscosity, 15 cS+e.g. 30+ cS(100.degree. C.) HVI PAO lube basestock produced from slack wax by thermal cracking to alpha olefins followed by Lewis acid catalyzed oligomerization of the alpha olefin mixture to lube base stock. Blending these components in appropriate proportions produces lube basestock having viscosities in the range of 8-15 cS (100.degree. C.) from which material suitable for the formulation of 10W-30 automobile engine lube can be produced. The blends are notable for exhibiting high VI values greater than that of either component of the blend.
Claims20
A hydrocarbon lubricant mixture having viscosity between about 7 cS and 15 cS at 100.degree. C., low pour point and enhanced viscosity index comprising a first hydrocarbon lubricant having a viscosity less than 7 cS at 100.degree. C. and a second hydrocarbon lubricant having a viscosity greater than 20 cS at 100.degree. C., produced by the Lewis acid catalyzed oligomerization of alpha olefins having an average carbon number of about 10 recovered from the thermal cracking of slack wax from a distillate petroleum fraction to form an olefin oligomer which is hydrogenated to form the second hydrocarbon lubricant.
A process for the production of hydrocarbon lubricant blends having low viscosity and an enhanced viscosity index comprising:
- a) hydroisomerizing slack wax to produce a hydrocarbon lubricant product having a viscosity between about 5 and 6 cS at 100.degree. C. and a viscosity index between about 140 and 149;
- b) thermally cracking a neutral slack wax to produce a mixture of alpha-olefins and recovering the portion of the alpha-olefin mixture having an average carbon number between about 10 and 11;
- c) oligomerizing the recovered alpha-olefins in contact with Lewis acid catalyst to provide hydrocarbon oligomer;
- d) hydrogenating the oligomer to form a hydrocarbon lubricant component having a viscosity between about 30 and 40 cS at 100.degree. C. with viscosity index between 120 and 140;
- e) mixing the step (a) lubricant product and the step (e) hydrocarbon oligomer to provide a lubricant blend having a viscosity between about 7 cS and 20 cS, viscosity index between about 140 and 160 and pour point below -15.degree. C.
A process for the production of hydrocarbon lubricant blends having low viscosity and an enhanced viscosity index comprising:
- mixing a first hydrocarbon lubricant having a viscosity less than 7 cS at 100.degree. C. with a viscosity index less than 150 and a second hydrocarbon lubricant having a viscosity greater than 30 cS at 100.degree. C., the second lubricant comprising the hydrogenated reaction product from Lewis acid catalyzed oligomerization of alpha olefins having an average carbon number of about 10 recovered from the thermal cracking of a neutral slack wax.
Dependencies are inferred from the claim text.