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AssigneeExxonMobil Research and Engineering Company
InventorsRobert Howie Barbour, David John Rickeard, Alan Mark Schilowitz
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This invention is a fuel composition having a sulphur content of ≦50 ppm by weight and comprising ≧50 ppm by weight of at least one fused polycyclic aromatic compound which has at least one hetero-atom selected from O and N either (a) as a heterocyclic group, or, (b) as an exocyclic group in which the hetero-atom is attached either directly or through one other carbon atom to a ring carbon atom wherein the fused polycyclic aromatic compound is substituted on at least one of its ring carbon atoms by a C1-C4 alkyl group. These compounds are capable of improving the antiwear and lubricity properties of a low sulphur fuels, especially diesel fuels, when compared with the performance of the same fuel in the absence of such compounds.
A fuel composition having a sulphur content of not more than 50 ppm by weight and comprising at least 50 ppm based on the total weight of the fuel composition of at least one fused polycyclic aromatic compound which comprises at least one hetero-atom selected from oxygen and nitrogen either
A fuel composition according to any one of the preceding claims wherein the fuel is a diesel fuel which has a sulphur content of 50 ppm or less.
A fuel composition according to any one of the preceding claims wherein the fuel is a diesel fuel containing 27 ppm of sulphur, 27 ppm of nitrogen, 20.55% of 1-ring aromatics, 7.77% of 2-ring aromatics and 0.68% of 3-ring aromatics.
A fuel composition according to any one of the preceding claims wherein the fused polycyclic aromatic compound comprises an aromatic moiety which has at least two fused rings of which at least one is an aromatic ring, which aromatic ring is optionally a heterocyclic ring, whether or not the remaining ring(s) in the fused polycyclic structure are aromatic.
A fuel composition according to any one of the preceding claims wherein the exocyclic group containing nitrogen is a primary amino group.
A fuel composition according to any one of the preceding claims wherein the fused polycyclic aromatic compound carrying a C1-C4 alkyl substituent in a non-α-position is 5-methyl benzimidazole.
A fuel composition according to claim 12 wherein the exocyclic group containing oxygen is selected from 2-hydroxy-4-methyl quinoline and 8-hydroxy quinaldine.
A fuel composition according to any one of the preceding claims wherein the alky substituent on the ring carbon atom is a methyl or an ethyl group.
A fuel composition according to any one of the preceding claims wherein the amount of the fused polycyclic aromatic compound which comprises at least one hetero-atom selected from nitrogen and oxygen and an alkyl substituent on a ring carbon atom is added to the fuel composition in an amount of 50-2000 ppm by weight of the total fuel composition.
A fuel composition according to any one of the preceding claims wherein the fused polycyclic aromatic compound which comprises at least one hetero-atom selected from nitrogen and oxygen and an alkyl substituent on a ring carbon atom is capable of acting as an antiwear and/or lubricity enhancing additive for the low sulphur fuel.
Dependencies are inferred from the claim text.