Use of a paraffinic base oil for the reduction of nitrogen oxide emissions

Abstract

The present invention relates to the use of a paraffinic base oil in a lubricant for the reduction of nitrogen oxide emissions of compression ignition engines, wherein the paraffinic base oil comprises (i) a continuous series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms, wherein n is between 15 and 40.

1 . A process comprising using a paraffinic base oil in a lubricant for the reduction of nitrogen oxide emissions of compression ignition engines, comprising using a paraffinic base oil in a lubricant wherein the paraffinic base oil comprises (i) a continuous series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms, wherein n is between 15 and 40. 
   
   
       2 . A process according to  claim 1 , wherein the paraffinic base oil is a Fischer-Tropsch derived base oil. 
   
   
       3 . A process according to  claim 1 , wherein the paraffinic base oil has a kinematic viscosity at 100° C. of from 3 to 25 mm 2 /s. 
   
   
       4 . A process according to  claim 1 , wherein the lubricant comprises at least 30% wt. of the paraffinic base oil. 
   
   
       5 . A process according to  claim 1 , wherein the lubricant comprises less than 50% v/v of a mineral-derived base oil. 
   
   
       6 . A process according to  claim 1 , wherein the fuel comprises a Fischer-Tropsch derived gas oil. 
   
   
       7 . A process comprising using a paraffinic base oil in the lubricant for the reduction of increase of formation of nitric and nitrous acid in the lubricant comprising using a paraffinic base oil in the lubricant in a compression ignition engine, wherein the paraffinic base oil comprises (i) a continuous series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms, and wherein n is between 15 and 40. 
   
   
       8 . A process for power generation with reduced exhaust nitrogen oxide gas emission, comprising operating a diesel engine and lubricating the engine with a lubricating oil composition, and wherein the lubricant composition comprises a base oil or base stock having a paraffin content of greater than 80 wt % paraffins and a saturates content of greater than 98 wt % and comprising (i) a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and wherein n is between 15 and 40.