Distillate fuel blends from Fischer Tropsch products with improved seal swell properties
AssigneeChevron U.S.A. Inc.
InventorDennis J. O'Rear
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Abstract
The invention provides distillate fuel blend components with improved seal swell and lubricity properties obtained from Fischer Tropsch products. The blends contain a highly paraffinic distillate fuel component and distillate-boiling alkylcycloparaffins and/or distillate-boiling alkylaromatics. The invention further provides processes for obtaining such blends using the products of Fischer Tropsch processes. Finally, the invention provides methods for improving seal swell and lubricity properties for distillate fuels.
Claims15
A distillate fuel blend with improved seal swell properties comprising:
- a) at least one highly paraffinic distillate fuel component having a branching index of less than about 5, and a volume increase of less than about 0.2% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal;
- and
- b) about 5 wt % to about 20 wt % of at least one component selected from the group consisting of alkylaromatics, alkylcycloparaffins and combinations thereof,
- wherein the blend exhibits a volume increase of more than about 0.2% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal.
A distillate fuel blend with improved seal swell properties comprising:
- a) at least one highly paraffinic distillate libel component having a branching index of less than 5, and a volume increase of less than about 0.5% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal;
- and
- b) about 5 wt % to about 20 wt % of at least one component selected from the group consisting of alkylaromatics, alkylcycloparaffins and combinations thereof,
- wherein the blend exhibits a volume increase of more than about 0.5% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal.
Dependencies are inferred from the claim text.