Diesel additive for improving cetane, lubricity, and stability
AssigneeExxon Research & Engineering Co.
InventorsBruce R. Cook, Paul J. Berlowitz, Robert J. Wittenbrink
Life of this patent
Estimating the term…
Abstract
A process for producing additive compositions, especially via a Fischer-Tropsch reaction, useful for improving the cetane number or lubricity, or both the cetane number and lubricity, of a mid-distillate, diesel fuel. In producing the additive, the product of a Fischer-Tropsch reaction is separated into a high boiling fraction and a low boiling, e.g., a 700.degree. F.- fraction. The high boiling fraction is hydroisomerized at conditions sufficient to convert it to a 700.degree. F.- low boiling fraction, the latter being blended with the 700.degree. F.- fraction and the diesel additive is recovered therefrom.
Claims12
A diesel fuel additive comprising
- (i) .gtoreq.90 wt % C.sub.16 -C.sub.20 paraffins, of which .gtoreq.50% are isoparaffins at least a portion of which are mono-methyl branched;
- (ii) cetane number of .gtoreq.87;
- (iii) .gtoreq.2500 ppm as oxygen of C.sub.14 -C.sub.16 linear, primary alcohols;
- (iv) a boiling range of 540.degree.-680.degree. F.
Dependencies are inferred from the claim text.