Fuel composition

C - Chemistry – Metallurgy – 10 – L

Patent

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Details

C10L 1/06 (2006.01) C10L 1/02 (2006.01)

Patent

CA 2325748

An unleaded formulated motor gasoline comprising a base blend composition having a MON of at least 80 e.g. 80 to less than 98 comprises component (a) at least 5 % (by volume of the total composition) of at least one hydrocarbon having the following formula (I): R-CH2-CH(CH3)-C(CH3)2-CH3 wherein R is hydrogen or methyl, especially triptane, and component (b) at least one saturated liquid aliphatic hydrocarbon having 4 to 12 carbon atoms. The corresponding unleaded formulated motor gasoline comprises also at least one motor gasoline additive. The blend or gasoline preferably contains at least one of aromatics, olefins, and oxygenates. The gasolines or blends give rise on combustion to reduced levels of emissions of exhaust gases, in particular carbon dioxide, carbon monoxide, nitrogen oxides and total hydrocarbons.

L'invention concerne une essence pour moteurs à formule sans plomb contenant une composition de mélange de base d'un IOM d'au moins 80, p. ex. entre 80 et 98 non compris, qui comporte comme constituant (a) au moins 5 % (en volume de la composition totale) d'au moins un hydrocarbure représenté par la formule (I): R-CH¿2?-CH(CH¿3?)-C(CH¿3?)¿2?-CH¿3?, dans laquelle R est hydrogène ou méthyle, notamment triptane; et comme constituant (b) au moins un hydrocarbure aliphatique liquide saturé possédant de 4 à 12 atomes de carbone. L'essence pour moteurs à formulation sans plomb correspondante comporte également au moins un additif d'essence pour moteurs. Le mélange ou l'essence contient de préférence au moins un élément du groupe formé par des aromatiques, des oléfines et des composés oxygénés. Les essences ou mélanges produisent à la combustion des taux réduits d'émissions de gaz d'échappement, en particulier de dioxyde de carbone, de monoxyde de carbone, d'oxydes d'azote et d'hydrocarbures complets.

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