Synthetic polyolefin lubricant blends having high viscosity indices
AssigneeMobil Oil Corporation
InventorsCatherine S. H. Chen, Margaret M. Wu
Life of this patent
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Abstract
Compositions and methods of preparation for a lubricant mixture having enhanced viscosity index comprising: (a) a low viscosity C.sub.20 -C.sub.60 lubricant range liquid comprising substantially linear hydrocarbons prepared by shape selective catalysis of lower olefin with medium pore acid zeolite catalyst to provide substantially linear liquid olefinic intermediates or C.sub.20.sup.+ hydrogenated lubricants, said lubricant range liquid having a kinematic viscosity of about 2-10 cS at 100.degree. C.; and (b) at least one poly(alpha-olefin) having viscosity greater than 20 cS and viscosity index improvement properties.
Claims27
A multi-stage process producing synthetic lubricant hydrocarbons by oligomerizing lower olefin feed at elevated temperature and pressure which comprises
- contacting the lower olefin in a primary reactor stage under oligomerization conditions with a medium pore shape-selective siliceous zeolite catalyst having acid cracking activity to produce a substantially linear olefin, intermediate-range hydrocarbon;
- contacting at least a portion of the primary stage effluent in a secondary reactor stage with an acid catalyst to produce a lubricant range hydrocarbon basestock having kinematic viscosity of about 2 to 6 cS at 100.degree. C.;
- hydrogenating at least a portion of said hydrocarbon basestock;
- and
- blending the hydrogenated basestock with at least one other hydrogenated lubricant range synthetic poly(alpha-olefin) having a kinematic viscosity of at least 20 cS to provide a lubricant blend composition, wherein said poly(alpha-olefin) has a branch ratio less than 0.19, a number average molecular weight of about 300 to 30,000, weight average molecular weight between 300 and 150,000, molecular weight distribution between 1.00 and 5, viscosity index greater than 130 and pour point below -15.degree. C.
A process for producing lubricant hydrocarbons by oligomerizing lower olefin feed at elevated temperature and pressure which comprises
- contacting the lower olefin under oligomerization conditions with a medium pore shape-selective siliceous zeolite catalyst having acid catalyst activity to produce an olefinic, substantially linear C.sub.20 lubricant range hydrocarbon having kinematic viscosity of about 2 to 10 cS at 100.degree. C.;
- hydrogenating at least a portion of said hydrocarbon basestock;
- and
- blending a major amount of the hydrogenated basestock with about 5 to 20 weight percent of at least one other lubricant range synthetic polyolefin having a kinematic viscosity of at least 20 cS, a branch ratio less than 0.19, viscosity index greater than 130 and pour point below -15.degree. C. to provide a lubricant blend composition having improved viscosity index.
A multi-stage process for producing lubricant hydrocarbons comprising the steps of:
- oligomerizing lower olefinic feed containing propylene or butylene at elevated temperature and pressure in a primary reactor stage under oligomerization conditions with a medium pore, shape-selective acid zeolite catalyst to produce a substantially linear olefinic, intermediate-range hydrocarbon;
- contacting at least a portion of intermediate range hydrocarbon in a secondary reactor stage with an acid catalyst to produce a C.sub.20 -C.sub.60 hydrocarbon lubricant basestock having kinematic viscosity of about 2 to 6 cS at 100.degree. C.;
- oligomerizing 1-decene in contact with reduced chromium oxide catalyst on a porous support to produce a polydecene lubricant range synthetic viscosity improving additive having a branch ration less than 0.19 and having a kinematic viscosity of at least 20 cS at 100.degree. C.;
- hydrogenating said C.sub.20 -C.sub.60 hydrocarbon lubricant basestock and said polydecene additive;
- and
- blending a major amount of the hydrogenated C.sub.20 -C.sub.60 hydrocarbon lubricant basestock with a minor amount of the hydrogenated polydecene to provide a lubricant blend composition having improved viscosity index and enhanced shear stability.
A multi-stage process for producing synthetic lubricant hydrocarbons by oligomerizing lower olefin feed at elevated temperature and pressure which comprises
- (a) contacting the lower olefin in a primary reactor stage under oligomerization conditions with medium pore shape-selective siliceous zeolite catalyst having acid catalyst activity to produce a substantially linear olefinic, intermediate-range hydrocarbon;
- (b) contacting at least a portion of the primary stage effluent in a secondary reactor stage with an acid catalyst to produce a lubricant range hydrocarbon basestock having kinematic viscosity of about 2 to 6 cS at lower 100.degree. C.;
- (c) hydrogenating at least a portion of said hydrocarbon basestock;
- (d) oligomerizing at least one C.sub.6 -C.sub.20 alpha-olefin with reduced chromium oxide catalyst and then hydrogenating the oligomerized product to produce poly(alphaolefin) having a kinematic viscosity of at least 20 cS;
- (e) blending basestock from step (c) with at least one other hydrogenated lubricant range synthetic poly(alpha-olefin) from step (d) in an amount sufficient to provide a lubricant blend composition having enhanced viscosity index and shear stability properties.
A process for producing lubricant hydrocarbons which comprises:
- (a) contacting C.sub.3 -C.sub.4 olefin under oligomerization conditions with a medium pore shape-selective siliceous zeolite catalyst having acid catalyst activity to produce an olefinic, substantially linear C.sub.20 + lubricant range hydrocarbon having kinematic viscosity of about 2 to 10 cS at 100.degree. C.;
- (b) hydrogenating at least a portion of said hydrocarbon basestock;
- (c) oligomerizing alpha-decene with reduced chromium oxide catalyst to produce liquid poly(alpha-decene) having a kinematic viscosity of at least 20 cS and branch ratio less than 0.19;
- and
- (d) blending a major amount of said hydrogenated basestock with about 5 to 20 weight percent of said poly(alpha-decene) to provide a lubricant blend composition having improved viscosity index.
Dependencies are inferred from the claim text.