Light-fraction based fuel composition for compression ignited engines

Abstract

A light fraction fuel composition for compression-ignited engines comprises about 25 v/v % to about 50 v/v % commercial diesel fuel; about 40 v/v % to about 69 v/v % straight run heavy naphtha about 5 v/v % to about 10 v/v % n-butanol; and about 0.2 v/v % to about 1.7 v/v % 2-Ethylhexyl nitrate. The relative percentages of commercial diesel fuel and straight run heavy naphtha are controlled to obtain a cetane number of at least 51 for a selected engine.

What is claimed is: 
     
         1 . A light fraction fuel composition for compression-ignited engines comprising:
 about 25 v/v % to about 50 v/v % commercial diesel fuel;   about 40 v/v % to about 69 v/v % straight run heavy naphtha;   about 5 v/v % to about 10 v/v % n-butanol; and   about 0.2 v/v % to about 1.7 v/v % 2-Ethylhexyl nitrate.   
     
     
         2 . The light fraction fuel composition of  claim 1 , wherein the relative percentages of commercial diesel fuel and straight run heavy naphtha are controlled to obtain a cetane number of at least 51 for a selected engine. 
     
     
         3 . The light fraction fuel composition of  claim 1 , wherein the relative percentages of commercial diesel fuel and straight run heavy naphtha are controlled to obtain a Reid vapor pressure in a range of about 7.28 PSI and about 10.88 PSI for a selected engine. 
     
     
         4 . The light fraction fuel composition of  claim 1 , wherein the relative percentages of commercial diesel fuel and straight run heavy naphtha are controlled to obtain a boiling point range of about 30 C (initial) to about 350 C (final). 
     
     
         5 . The light fraction fuel composition of  claim 1 , including about 26 v/v % commercial diesel, about 68 v/v % straight run heavy naphtha, about 5 v/v % n-butanol and about 1.0% 2-Ethylhexyl nitrate. 
     
     
         6 . The light fraction fuel composition of  claim 1 , including about 45 v/v % commercial diesel, about 49 v/v % straight run heavy naphtha, about 5 v/v % n-butanol and about 1.0% 2-Ethylhexyl nitrate. 
     
     
         7 . A light fraction fuel composition for compression-ignited engines comprising:
 about 0 v/v % to about 50 v/v % commercial diesel fuel;   about 40 v/v % to about 94 v/v % straight run heavy naphtha;   about 5 v/v % to about 10 v/v % n-butanol; and   about 0.2 v/v % to about 1.7 v/v % 2-Ethylhexyl nitrate.   
     
     
         8 . The light fraction fuel composition of  claim 7 , wherein the relative percentages of commercial diesel fuel and straight run heavy naphtha are controlled to obtain a cetane number of at least 51 for a selected engine. 
     
     
         9 . The light fraction fuel composition of  claim 7 , wherein the relative percentages of commercial diesel fuel and straight run heavy naphtha are controlled to obtain a Reid vapor pressure in a range of about 7.28 PSI and about 10.88 PSI for a selected engine. 
     
     
         10 . The light fraction fuel composition of  claim 7 , wherein the relative percentages of commercial diesel fuel and straight run heavy naphtha are controlled to obtain a boiling point range of about 30 C (initial) to about 350 C (final). 
     
     
         11 . The light fraction fuel composition of  claim 7 , including about 24 v/v % commercial diesel, about 70 v/v % straight run heavy naphtha, about 5 v/v % n-butanol and about 1.0% 2-Ethylhexyl nitrate. 
     
     
         12 . The light fraction fuel composition of  claim 7 , including about 45 v/v % commercial diesel, about 49 v/v % straight run heavy naphtha, about 5 v/v % n-butanol and about 1.0% 2-Ethylhexyl nitrate.