Fuel oil compositions

C - Chemistry – Metallurgy – 10 – L

Patent

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Details

C10L 1/22 (2006.01) C10L 1/14 (2006.01) C10L 1/2383 (2006.01) C10L 10/00 (2006.01) C10L 1/16 (2006.01) C10L 1/18 (2006.01) C10L 1/28 (2006.01)

Patent

CA 2284556

The invention provides a fuel oil composition comprising a major proportion of liquid hydrocarbon middle distillate fuel oil having a sulphur concentration of at most 0.05% to by weight, and a minor proportion of a dispersant additive obtained by reacting, in a molar ratio A:B in the range 4:3 to 1:10, (A) a polyakenyl derivative of monoethylenically unsaturated Ca-Coo dicarboxylic acid material in which the number average molecular weight (M n) of the polyalkenyl chain is in the range from 850 to 1150 with (B) a polyamine of the general formula H2N(CH2)m-[NH(CH2)m]n-NH2 where m is in the range from 2 to 4 and n is in the range from 1 to 6; a process for the preparation of such a fuel composition; and a method of operating a compression-ignition engine with enhanced injector cleanliness using such a fuel oil composition.

L'invention a trait à une composition fuel-oil contenant, d'une part, une proportion majeure de fuel-oil sous forme de distillat moyen d'hydrocarbure liquide et présentant une concentration en soufre d'au maximum 0,05 % en poids, et d'autre part, une proportion mineure d'un adjuvant de dispersion obtenu en faisant réagir, dans un rapport molaire A:B de l'ordre de 4:3 à 1:10, (A) un dérivé polyalcényle d'une matière acide dicarboxylique C4-C10 non saturé par la voie monoéthylénique dans laquelle le poids moléculaire moyen en nombre (Mn) de la chaîne polyalcényle est situé entre 850 et 1150, avec (B), une polyamine de la formule H2N(CH2)m-[NH(CH2)m]n-NH2 dans laquelle m est situé entre 2 et 4 et n est situé entre 1 et 6. L'invention concerne en outre un procédé de préparation d'une telle composition combustible et un procédé de fonctionnement d'un moteur Diesel qui augmente la propreté de l'injecteur grâce à l'utilisation de cette composition fuel-oil.

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