Low nitrogen content fuel with improved lubricity

Abstract

A hydrocarbon fuel is described comprising a hydrocarbon fuel boiling in the gasoline boiling range containing not greater than about 5 wppm nitrogen. The lubricity of such fuel is improved by the addition thereto of ethanol.

1 - 18 . (Cancelled).  
     
     
         19 . A method for improving the lubricity of hydrocarbon fuel boiling in the gasoline boiling range and suitable for use in a spark ignition internal combustion engine comprising a base fuel having a base fuel nitrogen content of about 5 wppm or less nitrogen, exclusive of nitrogen attributable to additives, by adding to said fuel at least about 2 vol % ethanol.  
     
     
         20 . The method of  claim 19  wherein the fuel contains about 3 wppm or less of nitrogen.  
     
     
         21 . The method of  claim 19  wherein the fuel contains about 2 wppm or less of nitrogen.  
     
     
         22 . The method of  claim 19  wherein the fuel contains about 0.5 wppm or less of nitrogen.  
     
     
         23 . The method of  claim 19 ,  20 ,  21  or  22  wherein the base fuel is further characterized containing about 50 wppm or less of sulfur.  
     
     
         24 . The method of  claim 19 ,  20 ,  21  or  22  wherein the base fuel is further characterized containing about 10 wppm or less of sulfur.  
     
     
         25 . The method of  claim 19 ,  20 ,  21  or  22  wherein the base fuel is further characterized containing about 5 wppm or less of sulfur.  
     
     
         26 . The method of  claim 19 ,  20 ,  21  or  22  wherein at least about 5 vol % ethanol is added to the fuel.  
     
     
         27 . The method of  claim 19 ,  20 ,  21  or  22  wherein about 5 to 15 vol % ethanol is added to the fuel.  
     
     
         28 . The method of  claim 23  wherein at least about 5 vol % ethanol is added to the fuel.  
     
     
         29 . The method of  claim 24  wherein at least about 5 vol % ethanol is added to the fuel.  
     
     
         30 . The method of  claim 25  wherein at least about 5 vol % ethanol is added to the fuel.  
     
     
         31 . The method of  claim 23  wherein about 5 to 15 vol % ethanol is added to the fuel.  
     
     
         32 . The method of  claim 24  wherein about 5 to 15 vol % ethanol is added to the fuel.  
     
     
         33 . The method of  claim 25  wherein about 5 to 15 vol % ethanol is added to the fuel.  
     
     
         34 . The method of  claim 23  wherein the nitrogen to sulfur weight ppm ratio of the fuel is about 0.01:1 to 1:1.  
     
     
         35 . The method of claim  17 ,  18 ,  19  or  20  wherein the fuel is further characterized as having a Reid Vapor Pressure of less than about 9 psi.  
     
     
         36 . (Cancelled)  
     
     
         37 . (Cancelled)  
     
     
         38 . A method for operating an internal combustion engine containing fuel system assemblies requiring lubrication including submerged fuel pump, fuel injectors, or both by supplying to said engine a fuel comprising gasoline containing about 5 wppm or less nitrogen and at least about 2 vol % ethanol.  
     
     
         39 . (Cancelled)