Lubricity additive, process for preparing lubricity...

C - Chemistry – Metallurgy – 10 – L

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C10L 1/18 (2006.01) C10L 1/19 (2006.01) C10L 10/04 (2006.01)

Patent

CA 2350632

The invention provides a lubricity additive in the form of an ester of an acid and an alcohol, wherein the acid is an aromatic mono-, di- or polyhydric, mono- , di- or polycarboxylic acid or mixture thereof, which may be alkylated and/or alkoxylated and wherein the alkyl and/or alkoxy groups, if any, are independently selected from groups having from 1 to 30 carbon atoms, characterised in that (a) the alcohol is glycerol, and (b) the mole percent of acid groups in the lubricity additive is less than 10 %, based on the total of acid and ester groups. The invention also provides a process for preparing the lubricity additive, and a middle distillate fuel oil having a sulphur concentration of 0.2 % by weight or less, and a minor portion of the lubricity additive.

L'invention concerne un additif lubrifiant se présentant sous la forme d'un ester d'un acide et d'un alcool. L'acide est un acide mono, di ou polyhydrique aromatique, di ou polycarboxylique, ou un mélange de ceux-ci, qui peut être alkylé et/ou alcoxylé et dans lequel les groupes alkyle et/ou alcoxy, s'il en existe, sont choisis indépendamment parmi les groupes renfermant 1 à 30 atomes de carbone. L'additif lubrifiant présente les caractéristiques suivantes: a) l'alcool est le glycérol; et b) le pourcentage molaire de groupes acides est inférieur à 10 % sur la base du total des groupes acide et ester. L'invention concerne également un procédé qui permet de préparer ledit additif lubrifiant, ainsi qu'un mazout de distillat moyen ayant une concentration en soufre inférieure ou égale à 0,2 % en poids et renfermant un pourcentage mineur dudit additif.

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