Diesel fuel composition

Abstract

A diesel fuel composition which essentially comprises only paraffins, and wherein the proportion of the content of paraffins of 15 or fewer carbons is made not less than 28% by volume and the proportion of normal paraffins of 18 or more carbons is made not more than 11% by volume. The diesel fuel composition has improved rubber swellability.

1 . A diesel fuel composition comprising essentially of paraffins, and wherein the proportion of the content of paraffins of 15 or fewer carbons is made not less than 28% by volume and the proportion of normal paraffins of 18 or more carbons is made not more than 11% by volume. 
     
     
         2 . The diesel fuel composition of  claim 1  wherein the proportion of the content of paraffins of 15 or fewer carbons is made not less than 40% by volume. 
     
     
         3 . The diesel fuel composition of  claim 2 , wherein the proportion of the content of paraffins of 15 or fewer carbons is made not less than 50% by volume. 
     
     
         4 . The diesel fuel composition of  claim 1  wherein the proportion of normal paraffins of 18 or more carbons is made not more than 8% by volume. 
     
     
         5 . The diesel fuel composition of  claim 1  wherein the proportion of normal paraffins of 18 or more carbons is made not more than 5% by volume. 
     
     
         6 . The diesel fuel composition  1 , wherein the 10% distillation temperature is not more than 250° C. and the 50% distillation temperature is not more than 300° C., and in that the proportion of the total peak area of the peak group at chemical shifts of 1.45 to 2.25 ppm relative to the total peak area of the peak group at chemical shifts of 1.00 to 1.45 ppm in proton nuclear magnetic resonance spectra is not less than 2.5%. 
     
     
         7 . The diesel fuel composition of  claim 6  wherein the 10% distillation temperature is not more than 200° C. 
     
     
         8 . A The diesel fuel composition of  claim 6  wherein the 50% distillation temperature is not more than 250° C. 
     
     
         9 . The diesel fuel composition of  claim 1 , wherein the value of Z as expressed by Formula (1) below is greater than −3.5.
     Z= 3.6988+0.0448 ×A− 0.0056 ×B− 0.0166 ×C− 0.0032 ×D    (1)
 
 
       wherein A is the proportion of the total peak area of the peak group at chemical shifts of 1.45 to 2.25 ppm relative to the total peak area of the peak group at chemical shifts of 1.00 to 1.45 ppm in proton nuclear magnetic resonance spectra, %; B is the 10% distillation temperature, ° C.; C is the 50% distillation temperature, ° C.; and D is the 90% distillation temperature, ° C. 
     
     
         10 . A The diesel fuel composition of  claim 9  wherein the value of Z is greater than −1.5. 
     
     
         11 . A The diesel fuel composition of  claim 1 , wherein the main constituent thereof does not contain styrene compounds or diene compounds, or condensed polycyclic aromatics. 
     
     
         12 . The diesel fuel composition of  claim 1 , wherein the total mass or volume of isoparaffins and normal paraffins is not less than 99% of the composition.