Fuel composition for diesel engines

Abstract

A fuel composition for diesel engines comprising: (1) up to 80% volume of one or more intermediate fractions selected from the group consisting of a straight-run ‘kerosene fraction, a straight-run light oil fraction, a cracked light oil fraction, a cracked kerosene fraction and hydrodesulphurised products of these; and (2) at least 20% volume of gas-to-liquid product, wherein, in a test of oxidation stability in accordance with the EN14112 test, the time until a change of electrical conductivity occurs at a liquid temperature of 150° C. is at least four hours.

1 . A fuel composition for diesel engines comprising: (1) up to 80% volume of one or more intermediate fractions selected from the group consisting of a straight-run kerosene fraction, a straight-run light oil fraction, a cracked light oil fraction, a cracked kerosene fraction and hydrodesulphurised products of these; and (2) at least 20% volume of gas-to-liquid product, wherein, in a test of oxidation stability in accordance with the EN14112 test, the time until a change of electrical conductivity occurs at a liquid temperature of 150° C. is at least four hours. 
     
     
         2 . The fuel composition of  claim 1  having the following properties:
 (1) 90% distillation curve distillation temperature no more than 360° C.;   (2) cetane number at least 45;   (3) saturated aliphatic hydrocarbon compound content at least 85% volume;   (4) total aromatic hydrocarbon content no more than 15% volume, and aromatic hydrocarbon content having two or more benzene rings no more than 2% volume; and   (5) total sulphur content no more than 10 mass ppmw.   
     
     
         3 . The fuel composition of  claim 1  comprising no more than 200 ppmw of an antioxidant. 
     
     
         4 . The fuel composition of  claim 2  comprising no more than 200 ppmw of an antioxidant. 
     
     
         5 . The fuel composition of  claim 3  wherein the antioxidant is a phenol-based antioxidant or an amine-based antioxidant. 
     
     
         6 . The fuel composition of  claim 4  wherein the antioxidant is a phenol-based antioxidant or an amine-based antioxidant. 
     
     
         7 . The fuel composition of  claim 3  wherein the antioxidant is a phenylene diamine-based antioxidant. 
     
     
         8 . The fuel composition of  claim 4  wherein the antioxidant is a phenylene diamine-based antioxidant. 
     
     
         9 . The fuel composition of  claim 3  wherein the antioxidant is 3,5-di-tertiary-butyl-4-hydroxytoluene. 
     
     
         10 . The fuel composition of  claim 4  wherein the antioxidant is 3,5-di-tertiary-butyl-4-hydroxytoluene. 
     
     
         11 . The fuel composition of  claim 3  wherein the time until a change of electrical conductivity occurs at a liquid temperature of 150° C. is at least six hours. 
     
     
         12 . The fuel composition of  claim 4  wherein the time until a change of electrical conductivity occurs at a liquid temperature of 150° C. is at least six hours. 
     
     
         13 . The fuel composition of  claim 5  wherein the time until a change of electrical conductivity occurs at a liquid temperature of 150° C. is at least six hours. 
     
     
         14 . The fuel composition of  claim 6  wherein the time until a change of electrical conductivity occurs at a liquid temperature of 150° C. is at least six hours. 
     
     
         15 . The fuel composition of  claim 7  wherein the time until a change of electrical conductivity occurs at a liquid temperature of 150° C. is at least six hours.