Synthetic isoparaffinic premium heavy lubricant base stock
AssigneeExxonMobil Research and Engineering Company
InventorsJack Wayne Johnson, Adeana Richelle Bishop, William Berlin Genetti, Loren Leon Ansell, Rocco Anthony Fiato
Life of this patent
Estimating the term…
Abstract
A synthetic, isoparaffinic heavy hydrocarbon composition useful as a heavy lubricant base stock contains hydrocarbon molecules having consecutive numbers of carbon atoms, is a liquid at 100° C., at which temperature its kinematic viscosity is above 8 cSt and has respective initial and end boiling points of at least 850 and 1000° F. (454 and 538° C.). The branching index BI and the branching proximity CH2>4 of the isoparaffinic hydrocarbon molecules, are such that: BI−0.5(CH2>4)<15; and (a) BI+0.85(CH2>4)<45; (b) as measured over the hydrocarbon composition as a whole.
Claims22
A hydrocarbon composition comprising at least 95 wt % paraffin molecules, of which at least 90 wt % are isoparaffins, containing hydrocarbon molecules having consecutive numbers of carbon atoms, is a liquid at 100° C., at which temperature its kinematic viscosity is above 8 cSt, has respective initial and end boiling points of at least 850 and 1000° F. (454 and 538° C.), wherein the branching index BI, and the branching proximity CH2>4 of said isoparaffinic hydrocarbon molecules, are such that:
- BI−0.5(CH2>4)<15;
- and (a)
- BI+0.85(CH2>4)<45;
- (b)
- as measured over the hydrocarbon composition as a whole.
A synthetic, isoparaffinic, heavy lubricant base stock composition comprising at least 95 wt % paraffin molecules, of which at least 90 wt % are isoparaffins, containing hydrocarbon molecules having consecutive numbers of carbon atoms, is a liquid at 100° C., at which temperature its kinematic viscosity is above 8 cSt, has respective initial and end boiling points of at least 850 and 1000° F. (454 and 538° C.), wherein the branching index BI, and the branching proximity CH2>4 of said isoparaffinic hydrocarbon molecules, are such that:
- BI−0.5(CH2>4)<15;
- and (a)
- BI+0.85(CH2>4)<45;
- (b)
- as measured over the hydrocarbon composition as a whole.
Dependencies are inferred from the claim text.