Patent ID: 8444718

Claim:
A process to prepare an aviation fuel and an automotive as oil from a source of mineral derived gas oil, the process comprising: separating from the source of mineral derived as oil a low boiling fraction boiling for more than 90 vol % at from 130 to 300° C. and has a density of from 775 to 840 kg/m 3 , the low boiling fraction being suitable for use as an aviation fuel or as an aviation fuel component; and blending the remaining part of the source of mineral derived gas oil with a Fischer-Tropsch derived kerosene fraction having a distillation range of from 140 to 260° C., a density of from 0.73 to 0.760 gm/cm 3 at 15° C. and a cetane number of from 63 to 75 and/or a Fischer Tropsch derived gas oil fraction boiling for more than 90 vol % between 150 and 380° C., a density of from 0.76 to 0.79 g/cm 3 at 15° C. and a cetane number of greater than 70; thereby providing a resultant blend suited for use as at least part of an automotive gas oil meeting applicable fuel specifications comprising a density of from 820 to 845 kg/m 3 at 15° C. and a cetane number of above 51.