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US 4,950,822 AGranted
Olefin oligomer synlube process
AssigneeEthyl Corporation
InventorsThomas J. Dileo, Marshall B. Nelson, Matthew J. Lynch
Life of this patent
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Abstract
Unsaturated .alpha.-olefin oligomers are topped to remove monomer and dimer and then distilled to remove a trimer fraction leaving a residue of tetramer, pentamer and higher oligomers. The trimer fraction is hydrogenated to form saturated .alpha.-olefin oligomer suitable for use as a lubricant.
Claims3
A process for preparing a saturated olefin oligomer fraction suitable for use as an internal combustion engine lubricant, said process comprising:
- (a) oligomerizing a C.sub.8-12 .alpha.-olefin with a promoted BF.sub.3 catalyst to obtain a crude unsaturated oligomer containing unsaturated monomer, dimer, trimer, tetramer and higher unsaturated oligomers,
- (b) distilling said crude unsaturated oligomer to remove said monomer and dimer leaving a substantially dimer-free unsaturated oligomer,
- (c) distilling said dimer-free unsaturated oligomer to obtain a distillate fraction containing at least 90 weight percent of trimer, and
- (d) hydrogenating said distillate fraction to obtain said saturated olefin oligomer.
1 more element
Dependencies are inferred from the claim text.