Methods for reducing oxidation
AssigneeBP Oil International Limited
InventorSorin Vasile Filip
Life of this patent
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Abstract
A method for reducing the tendency of a hydrocarbon fluid to oxidise comprises combining an additive having a chemical structure comprising a 6-membered aromatic ring sharing two adjacent aromatic carbon atoms with a 6- or 7-membered saturated heterocyclic ring, the 6- or 7-membered saturated heterocyclic ring comprising a nitrogen atom directly bonded to one of the shared carbon atoms to form a secondary amine and an atom selected from oxygen or nitrogen directly bonded to the other shared carbon atom, the remaining atoms in the 6- or 7-membered heterocyclic ring being carbon with the hydrocarbon fluid. The additive may also be used for protecting a system in which a hydrocarbon fluid is used from the effects of oxidation.
Claims23
A method for reducing the tendency of a hydrocarbon fluid to oxidise, said method comprising combining an additive with the hydrocarbon fluid, wherein the additive has the formula:
- where:
- R1 is hydrogen;
- R2, R3, R4, R5, R11 and R12 are each independently selected from hydrogen, alkyl, alkoxy, alkoxy-alkyl, secondary amine and tertiary amine groups;
- R6, R7, R8 and R9 are each independently selected from hydrogen, alkyl, alkoxy, alkoxy-alkyl, secondary amine and tertiary amine groups;
- X is selected from —O— or —NR10—, where R10 is selected from hydrogen and alkyl groups;
- n is 0 or 1;
- L is a linking group;
- m is 1, 2 or 3;
- and
- P is a polymer-containing group or a group derived from a fatty acid,
- wherein at least one of R2, R3, R4, R5, R6, R7, R8, R9, R11 and R12 is selected from a group other than hydrogen,
- with the proviso that, where the additive has formula (b) or (c), one of R6, R7, R8 and R9 on each 6-membered aromatic ring is substituted with the linking group L or the polymer-containing group P, respectively.
Dependencies are inferred from the claim text.