Process for preparing a diesel fuel composition
Process for preparing a diesel fuel composition comprising the steps of: (i) blending a Fischer-Tropsch derived gasoil with a petroleum derived gasoil to form a blended gasoil which is compliant with the EN590 specification, wherein the Fischer-Tropsch derived gasoil has a density of 0.8 g/cm 3 or less and wherein the petroleum derived gasoil is derived from naphthenic high density petroleum crude oil and has a density at 15° C. of 0.84 g/cm 3 or greater and a naphthenics content of 30 wt % or greater; and (ii) mixing the blended gasoil produced in step (i) with a diesel base fuel to form a diesel fuel composition, wherein the diesel fuel composition has a density at 15° C. in the range from 0.820 g/cm 3 to 0.845 g/cm 3 .
1. A process for preparing a diesel fuel composition comprising the steps of:
(i) blending a Fischer-Tropsch derived gasoil with a petroleum derived gasoil to form a blended gasoil wherein the blended gasoil has maximum density of 845 kg/m 3 , wherein the Fischer-Tropsch derived gasoil has a density of 0.8 g/cm 3 or less at 15° C. and wherein the petroleum derived gasoil is derived from naphthenic high density petroleum crude oil and has a density of 0.84 g/cm 3 or greater at 15° C. and a naphthenics content of 50 wt % or greater, wherein the petroleum-derived gasoil is present in the blended gasoil formed in step (i) at a level in the range from 50 wt % to 60 wt %, by weight of the blended gasoil formed in step (i); and
(ii) mixing the blended gasoil produced in step (i) with a diesel base fuel to form a diesel fuel composition, wherein the diesel base fuel is a diesel base fuel having a maximum density of 845 kg/m 3 , wherein the diesel fuel composition has a density at 15° C. in the range from 0.820 g/cm 3 to 0.845 g/cm 3 .
2. The process according to claim 1 wherein the petroleum derived gasoil has a density of 0.85 g/cm 3 or greater.
3. The process according to claim 1 wherein the Fischer-Tropsch derived gasoil is present at a level in the range of from 10 wt % to 50 wt %, by weight of the blended gasoil formed in step (i).
4. The process according to claim 1 wherein the kinematic viscosity at 40° C. of the blended gasoil formed in step (i) is at least 3 mm 2 /s.
5. The process according to claim 1 wherein the density at 15° C. of the blended gasoil formed in step (i) is in the range of from 830 g/cm 3 to 845 g/cm 3 .
6. The process according to claim 1 wherein the blended gasoil formed in step (i) has a cetane number of 60 or higher.
7. The process according to claim 1 wherein the Fischer-Tropsch derived gasoil is present in the blended gasoil formed in step (i) at a level in the range of from 40 wt % to 50 wt %, by weight of the blended gasoil formed in step (i).