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US 8,221,614 B2Granted
Base oil formulations
AssigneeShell Oil Company
InventorsGilbert Robert Bernard Germaine, David John Wedlock
Life of this patent
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AssigneeShell Oil Company
InventorsGilbert Robert Bernard Germaine, David John Wedlock
Estimating the term…
Base oil formulation containing (i) a Fischer-Tropsch derived light base oil and (ii) a Fischer-Tropsch derived gas oil. The formulation can be prepared by back-blending a Fischer-Tropsch derived light base oil with a Fischer-Tropsch derived gas oil, for instance derived from the same Fischer-Tropsch synthesis. Also provided is the use of a Fischer-Tropsch derived gas oil in a base oil formulation containing a Fischer-Tropsch derived light base oil, for the purpose of improving the cold flow properties of the formulation while maintaining its flash point above a desired target value, and/or for the purpose of reducing the concentration of a cold flow additive in the formulation, preferably with less of a reduction in the flash point of the formulation than theory would have predicted to occur due to the incorporation of the Fischer-Tropsch derived gas oil.
A base oil formulation consisting essentially of (i) a Fischer-Tropsch derived light base oil and (ii) a Fischer-Tropsch derived gas oil wherein the concentration of the Fischer-Tropsch derived gas oil is from 1 to 20 wt %.
A method for preparing a base oil formulation, the method comprising obtaining a Fischer-Tropsch derived light base oil and blending it with a Fischer-Tropsch derived gas oil wherein the concentration of the Fischer-Tropsch derived gas oil is from 1 to 20 wt %.
A method for improving the cold flow properties and/or reducing the kinematic viscosity of a base oil formulation which contains a Fischer-Tropsch derived light base oil, whilst still achieving a target minimum flash point X for the formulation, which method comprises adding to the formulation a concentration c of a Fischer-Tropsch derived gas oil, wherein c is higher than the maximum concentration c′ of the Fischer-Tropsch derived gas oil which theory would predict could be added to the formulation without reducing the flash point of the formulation below the target minimum X wherein the concentration of the Fischer-Tropsch derived gas oil is from 1 to 20 wt %.
Dependencies are inferred from the claim text.