Renewable diesel

Abstract

The present technology relates to hydrocarbon fuels comprising renewable content. More particularly, the technology relates to manufacture of renewable diesel for potential use as aviation turbine fuel blendstock.

What is claimed is: 
     
         1 . A jet fuel comprising
 about 99 vol. % to about 70 vol. % petroleum jet fuel; and   about 1 vol. % to about 30 vol. % of an overhead renewable diesel fraction with a difference of 20° C. or less between its final boiling point (FBP) and its 95% boil-off temperature (T95) according to ASTM D2887 simulated distillation test method and with an existent gum value of 7 mg/100 mL or less according to ASTM D381;
 wherein the overhead renewable diesel fraction is produced by 
 a. subjecting a feedstock comprising free fatty acids, mono-, di-, and/or tri-glycerides to hydrodeoxygenation (HDO) to produce an HDO effluent comprising C 14 -C 18  n-paraffins; 
 b. subjecting the HDO effluent to hydroisomerization to produce a hydroisomerizate comprising C 14 -C 18  isoparaffins and unreacted C 14 -C 18  n-paraffins, where the hydroisomerizate has a value of final boiling point minus 95% boil-off temperature (FBP-T95) that is greater than 30° C. as measured by ASTM D2887 simulated distillation test method; and 
 c. separating the hydroisomerizate in a flash drum into the overhead renewable diesel fraction and a bottoms fraction wherein both fractions comprise C 14 -C 18  n-paraffins and C 14 -C 18  isoparaffins. 
   
     
     
         2 . The jet fuel of  claim 1 , wherein the overhead renewable diesel fraction comprises at least 90% C 14 -C 18  n-paraffins and iso-paraffins. 
     
     
         3 . The jet fuel of  claim 1 , wherein the cloud point of the overhead renewable diesel fraction is less than −5° C. 
     
     
         4 . The jet fuel of  claim 3 , wherein the cloud point of the overhead renewable diesel fraction is between—−12° C. and −30° C. 
     
     
         5 . The jet fuel of  claim 1 , wherein the feedstock comprises tallow, lard, poultry fat, fish oil, canola oil, rapeseed oil, palm oil, soybean oil, corn oil, jatropha oil, carinata oil, cotton seed oil, hempseed oil, sunflower oil, greases from restaurants and/or food processing operations, microbial oil, or a combination of any two or more thereof. 
     
     
         6 . The jet fuel of  claim 1 , wherein the hydrodeoxygenation is performed under at least 500 psia hydrogen partial pressure at temperatures in the 500-700° F. range over a sulfided molybdenum catalyst promoted by nickel and/or cobalt. 
     
     
         7 . The jet fuel of  claim 1 , wherein the hydroisomerization is performed under at least 500 psia hydrogen partial pressure at temperatures in the 580-680° F. range over a bifunctional catalyst comprising platinum or tungsten and a support comprising silica. 
     
     
         8 . The jet fuel of  claim 1 , wherein the feedstock is diluted with a hydrocarbon solvent. 
     
     
         9 . The process of  claim 8 , wherein the hydrocarbon solvent is a petroleum middle distillate.