Blending of dewaxed biofuels and synthesized paraffinic kerosines with mineral-based kero(jet) distillate cuts to provide on-spec jet fuels

Abstract

The present invention describes a method of making a jet fuel composition comprising: blending from about 3 vol % to about 30 vol % of a catalytically and/or thermally cracked blendstock into a non-cracked jet-boiling-range distillate to produce a jet-type blend with a smoke point less than 18 mm; and thereafter, blending from about 2 vol % to about 50 vol % of synthesized paraffinic kerosine (SPK) into the jet-type blend to produce a jet fuel with a smoke point of at least 18 mm.

What is claimed is: 
     
         1 . A method of making a jet fuel comprising:
 blending from about 3 vol % to about 30 vol % of a catalytically and/or thermally cracked blendstock into a non-cracked jet-boiling-range distillate to produce a jet-type blend with a smoke point less than 18 mm; and   thereafter, blending from about 2 vol % to about 50 vol % of synthesized paraffinic kerosine into the jet-type blend to produce a jet fuel with a smoke point of at least 18 mm.   
     
     
         2 . The method according to  claim 1 , wherein the blending of synthesized paraffinic kerosine into the jet-type blend achieves at least one of the following for the resulting jet fuel: a JFTOT pass at or above about 260° C.; a naphthalenes content below about 3.0 vol %, an aromatics content below about 25 vol %, and a total sulfur content below 0.30 mass %. 
     
     
         3 . The method according to  claim 1 , further comprising utilizing a relationship between smoke point and concentration of cracked blendstock and/or a relationship between smoke point and concentration of synthesized paraffinic kerosine to assist in selecting appropriate amounts of different components in the jet fuel product. 
     
     
         4 . The method according to  claim 3 , wherein measurement of smoke point is carried out with an automated procedure. 
     
     
         5 . The method according to  claim 1 , wherein measurement of smoke point is carried out with an automated procedure. 
     
     
         6 . The method according to  claim 1 , wherein the cracked blendstock comprises heavy cat naphtha from fluid catalytic cracking. 
     
     
         7 . The method according to  claim 1 , wherein the synthesized paraffinic kerosine comprises hydrotreated vegetable oil (HVO).