Kerosene compositions

Abstract

A method of controlling the odour emitted by a kerosene composition such that it is below a specified level, by ensuring that the composition has the following properties: (1) the range from initial boiling point to end point, in accordance with the atmospheric pressure distillation test method stipulated in JIS K2254, is in the range of 140° C. to 300° C.; (2) the density is 0.81 g/cm 3 or less; (3) the aromatic hydrocarbon content is 0 to 20% by volume; (4) the sulphur content derived from benzothiophenes and dibenzothiophenes is 0 to 50 ppm by mass; and (5) the fraction at 250° C. and above is 0 to 20% by volume; and such a kerosene composition.

1 . A method of controlling the odour emitted by a kerosene composition such that it is below a specified level, which method comprises ensuring that said composition has the following properties: 
 (1) the range from initial boiling point to end point, in accordance with the atmospheric pressure distillation test method stipulated in JIS K2254, is in the range of 140° C. to 300° C.;    (2) the density is 0.81 g/cm 3  or less;    (3) the aromatic hydrocarbon content is 0 to 20% by volume;    (4) the sulphur content derived from benzothiophenes and dibenzothiophenes is 0 to 50 ppm by mass; and    (5) the fraction at 250° C. and above is 0 to 20% by volume.    
   
   
       2 . The method of  claim 1  which comprises ensuring that said kerosene composition has a bromine index of 65 Br 2 mg/100 g or less.  
   
   
       3 . The method of  claim 1  which comprises ensuring that said kerosene composition satisfies the following odour formula (T formula): 
       10 Log{[4D+6(BT+DBT)+20A+Or+4T 250 ]/(0.01S) }≦ — 84.0 
     where: 
 Log is a natural logarithm;  
 D is the density of the kerosene composition (g/cm 3 );  
 BT is the sulphur content derived from benzothiophenes in the kerosene composition (ppm by mass);  
 DBT is the sulphur content derived from dibenzothiophenes in the kerosene composition (ppm by mass);  
 A is the aromatic hydrocarbon content of the kerosene composition (% by volume);  
 Or is the bromine index of the kerosene composition (Br 2  mg/100 g after conversion to bromine);  
 T 250  is the amount of distillate at 250° C. or more in the kerosene composition, in accordance with the atmospheric pressure distillation test method stipulated in JIS K2254 (% by volume); and  
 S is the smoke point (mm);  
 said odour formula being 80 or less.  
 
   
   
       4 . The method of  claim 3  which comprises ensuring that the smoke point is 21 mm or higher.  
   
   
       5 . The method of  claim 1  which comprises ensuring that the density is 0.73 to 0.81 g/cm 3 .  
   
   
       6 . The method of  claim 1  which comprises ensuring that the aromatic hydrocarbon content is 18% by volume or less.  
   
   
       7 . The method of  claim 1  which comprises ensuring that the sulphur content derived from benzothiophenes and dibenzothiophenes is 0 to 10 ppm by mass.  
   
   
       8 . The method of  claim 1  wherein said benzothiophenes and dibenzothiophenes are selected from the group consisting of C1 benzothiophenes, other alkylbenzothiophenes, dibenzothiophenes, methyldibenzothiophenes, C1 alkyl[di]benzothiophenes, 4,6-dimethyldibenzothiophene, C2 dibenzothiophene, and other alkyldibenzothiophenes.  
   
   
       9 . The method of  claim 1  which comprises ensuring that the fraction at 250° C. and above is 0 to 18% by volume.  
   
   
       10 . A kerosene composition as defined in  claim 1.