| 主权项 |
1. A fuel composition comprising a Fischer-Tropsch derived middle distillate fuel and a middle distillate flow improver, the remainder of the composition being another fuel component or mixture of fuel components, the other fuel component being selected from a petroleum derived middle distillate fuel, hydrogenated vegetable oil, fatty acid methyl esters, and other Fischer Tropsch products such as light F-T base oil;
wherein the amount of the Fischer-Tropsch derived middle distillate fuel is more than 80% v/v of the total composition; the maximum weight content in the carbon number distribution of the n-paraffins in the Fischer-Tropsch derived middle distillate fuel is below C16 and the weight ratio of iso to normal paraffins in the Fischer-Tropsch derived middle distillate fuel is 3.5:1 or higher; and wherein the middle distillate flow improver is a substituted ethylene polymer, being a single long alkyl chain substituted with acetate ester groups and 2-ethylhexanoate ester groups and further carrying some methyl branches, wherein the average ratio of acetate to 2-ethylhexanoate is 1:8, the mole percentage of acetate is 2% and 2-ethylhexanoate 16%, and the average number of methyl branches per 100 methylene groups is 4.9. |
