Abstract: A liquid fuel composition for a spark ignition internal combustion engine comprising (a) gasoline blending components, (b) Fischer-Tropsch derived naphtha at a level of up to 50% v/v and (c) oxygenated hydrocarbon at a level less than 50% v/v. While the low octane number of Fischer-Tropsch derived naphtha would normally severely restrict its blendability in gasoline to low levels, it has now been found that Fischer-Tropsch derived naphtha can be included in, for example, ethanol-containing gasoline fuel compositions, in surprisingly and significantly high blend ratios of Fischer-Tropsch derived naphtha to ethanol.

Abstract: Use of a paraffinic gasoil in a diesel fuel composition for reducing the build up of deposits in an Exhaust Gas Recirculation (EGR) system of a compression ignition internal combustion engine.

Abstract: Gasoline fuel composition suitable for use in an internal combustion engine comprising: (a) Fischer-Tropsch derived naphtha at a level from 2 to 20% v/v; (b) at least one aromatic octane booster present at a level of 0.75 to 8% v/v or less; and (c) a gasoline base fuel; wherein the gasoline fuel composition comprises 40% v/v or less of aromatics. In a preferred embodiment, the Research Octane Number (RON) of the gasoline fuel composition is increased while maintaining the aromatic content of the gasoline fuel composition at a level of 40% v/v or less, based on the gasoline fuel composition.

Abstract: Use of a paraffinic gasoil in a diesel fuel composition for reducing the build up of deposits in an Exhaust Gas Recirculation (EGR) system of a compression ignition internal combustion engine.

Abstract: Diesel fuel composition suitable for use in an internal combustion engine comprising: (a) 2 mass % to 30 mass % of kerosene having a kinematic viscosity at 40° C. of 1.5 mm2/s or less and a density of 810 kg/m3 or less; (b) 2 mass % to 20 mass % of Fischer-Tropsch derived base oil having a kinematic viscosity at 40° C. of 7.5 mm2/s or greater and a density of 790 kg/m3 or greater; and (c) diesel base fuel. The diesel fuel composition of the present invention provides improved cold flow properties while simultaneously maintaining other properties such as viscosity and density within diesel fuel specification requirements.

Abstract: A liquid fuel composition for a spark ignition internal combustion engine comprising (a) gasoline blending components, (b) Fischer-Tropsch derived naphtha at a level of up to 50% v/v and (c) oxygenated hydrocarbon at a level less than 50% v/v. While the low octane number of Fischer-Tropsch derived naphtha would normally severely restrict its blendability in gasoline to low levels, it has now been found that Fischer-Tropsch derived naphtha can be included in, for example, ethanol-containing gasoline fuel compositions, in surprisingly and significantly high blend ratios of Fischer-Tropsch derived naphtha to ethanol.

Abstract: Gasoline fuel composition suitable for use in an internal combustion engine comprising: (a) Fischer-Tropsch derived naphtha at a level from 2 to 20% v/v; (b) at least one aromatic octane booster present at a level of 0.75 to 8% v/v or less; and (c) a gasoline base fuel; wherein the gasoline fuel composition comprises 40% v/v or less of aromatics. In a preferred embodiment, the Research Octane Number (RON) of the gasoline fuel composition is increased while maintaining the aromatic content of the gasoline fuel composition at a level of 40% v/v or less, based on the gasoline fuel composition.

Abstract: Diesel fuel composition suitable for use in an internal combustion engine comprising: (a) 2 mass % to 30 mass % of kerosene having a kinematic viscosity at 40° C. of 1.5 mm2/s or less and a density of 810 kg/m3 or less; (b) 2 mass % to 20 mass % of Fischer-Tropsch derived base oil having a kinematic viscosity at 40° C. of 7.5 mm2/s or greater and a density of 790 kg/m3 or greater; and (c) diesel base fuel. The diesel fuel composition of the present invention provides improved cold flow properties while simultaneously maintaining other properties such as viscosity and density within diesel fuel specification requirements.

Abstract: A method of operating a diesel fuel-consuming system, and/or apparatus which is driven by such a system, the method comprising introducing into the system a diesel fuel formulation containing 10% v/v or more of paraffinic hydrocarbons and an antioxidant and a species selected from: (iii) detergents; (iv) mixtures containing both a lubricity improver and a conductivity improver; and (v) combinations of (i) and (ii). The methods results in an increase in the oxidative stability of the formulation and/or in a reduction of the concentration of an antioxidant which is present in the formulation. The formulation may comprise a Fischer-Tropsch derived diesel fuel component or mixture thereof.

Abstract: Use in a gas oil fuel composition, which preferably comprises a Fischer-Tropsch derived fuel, of a compound according to formula (I): wherein: R1 to R4 are each independently hydrogen or a C1-10 alkyl group, where such alkyl groups may be the same as or different from one another; and X is a nitrogen- or oxygen-containing group, for the purpose of reducing the cetane number of said fuel composition; preparation of such a fuel composition; and operating a fuel consuming system.

Abstract: A liquid fuel composition suitable for use in an internal combustion engine is provided containing (a) from 50 to 90 % v/v of a C1-C4 alcohol; (b) from 10 to 50 % v/v of a Fischer-Tropsch derived naphtha; and optionally (c) up to 10 % v/v of a C3-C6 hydrocarbon component. A process for preparing a liquid fuel composition and a method of operating an internal combustion engine is also disclosed.

Abstract: A fuel composition is prepared by blending a petroleum derived low sulphur diesel with a Fischer-Tropsch derived gasoil and a Fischer-Tropsch derived base oil wherein the amount of the petroleum derived low sulphur diesel is from 60% up to 80% v/v of the total composition; the amount of Fischer-Tropsch derived gasoil is from 10% up to 30% v/v of the total composition; the amount of Fischer-Tropsch derived base oil is from 10% up to 30% v/v of the total composition; the amounts of the Fischer-Tropsch derived gas oil and Fischer-Tropsch derived base oil together being at least 20% v/v of the total composition. The fuel compositions of the invention have improved properties, in terms that they display increased power when compared to fuel compositions in which the Fischer-Tropsch derived base oil component is not present.

Abstract: In a fuel composition containing a static dissipator additive, a Fischer-Tropsch derived fuel component is blended for the purpose of increasing the electrical conductivity of the composition and/or for reducing the concentration of the static dissipator additive in the composition. The fuel composition is preferably an automotive diesel fuel composition.

Abstract: Use in a gas oil fuel composition, which preferably comprises a Fischer-Tropsch derived fuel, of a compound according to formula (I): wherein: R1 to R5 are each independently hydrogen or a C1-10 alkyl group, where such alkyl groups may be the same as or different from one another; X is a nitrogen- or oxygen-containing group, for the purpose of reducing the cetane number of said fuel composition; preparation of such a fuel composition; and operating a fuel consuming system.

Abstract: A method for increasing the cetane number of a fuel composition containing a Fischer-Tropsch derived fuel component, in order to reach a target cetane number X, is provided by adding to the composition a concentration c of an ignition improver, wherein c is lower than the concentration which theory would predict needed to be added in order to achieve the target. The ignition improver is preferably 2-ethylhexyl nitrate and the fuel composition suitably a diesel or kerosene fuel. A fuel composition for use in a compression ignition engine, which has a cetane number of 85 or greater, and contains a Fischer-Tropsch derived fuel component and an ignition improver is also disclosed.

Abstract: A diesel fuel based on a blend of a diesel fuel derived from a Fischer-Tropsch process, and a mineral oil based diesel fuel having a sulfur content of less than 100 ppmw; and a method of operating a diesel engine, which method involves combusting such diesel fuel in the diesel engine.

Abstract: A diesel fuel based on a blend of a diesel fuel derived from a Fischer-Tropsch process, and a mineral oil based diesel fuel having a sulfur content of less than 100 ppmw; and a method of operating a diesel engine, which method involves combusting such diesel fuel in the diesel engine.

Abstract: A process to prepare an aviation fuel and an automotive gas oil from a source of mineral derived gas oil is provided. From the mineral derived gas oil a low boiling fraction is isolated for use as an aviation fuel or as an aviation fuel component and the remaining part of the mineral derived gas oil is blended with a Fischer-Tropsch derived kerosene fraction and/or a Fischer-Tropsch derived gas oil fraction to obtain a blend suited for use as at least part of an automotive gas oil.

Abstract: Use in a gas oil fuel composition, which preferably comprises a Fischer-Tropsch derived fuel, of a compound according to formula (I): wherein: R1 to R5 are each independently hydrogen or a C1-10 alkyl group, where such alkyl groups may be the same as or different from one another; X is a nitrogen- or oxygen-containing group, for the purpose of reducing the cetane number of said fuel composition; preparation of such a fuel composition; and operating a fuel consuming system.

Abstract: Use in a gas oil fuel composition, which preferably comprises a Fischer-Tropsch derived fuel, of a compound according to formula (I): wherein: R1 to R4 are each independently hydrogen or a C1-10 alkyl group, where such alkyl groups may be the same as or different from one another; and X is a nitrogen- or oxygen-containing group, for the purpose of reducing the cetane number of said fuel composition; preparation of such a fuel composition; and operating a fuel consuming system.