Use of tetrahydrobenzoxazines as stabilisers
AssigneeBASF SE
InventorsArno Lange, Helmut Mach, Hans Peter Rath, Dietmar Posselt
Life of this patent
Estimating the term…
Abstract
The use of tetrahydrobenzoxazines I where R1 is a hydrocarbyl radical and R2, R3, R4 and R5 are each independently hydrogen atoms, hydroxyl groups or hydrocarbyl radicals, and where R2 to R5 may also form a second and a third tetrahydrooxazine ring, with the proviso that at least one of the substituents has from 4 to 3000 carbon atoms and the remaining substituents, when they are hydrocarbyl radicals, each have from 1 to 20 carbon atoms, as stabilizers for stabilizing inanimate organic material, especially turbine fuels, against the action of light, oxygen and heat.
Claims8
A method to operate a turbine engine, comprising:
- adding a tetrahydrobenzoxazine of formula I to a liquid turbine fuel comprising kerosene to obtain a stabilized turbine fuel;
- supplying the turbine engine with the stabilized turbine fuel through fuel lines;
- and
- combusting the stabilized fuel in the turbine;
- wherein the liquid turbine fuel is selected from the group consisting of Jet Fuel A, Jet Fuel A-1, Jet Fuel B, Jet Fuel JP-4, JP-5, JP-7, JP-8 and JP-8+100 according to ASTM D 1655 and DEF STAN 91-91, and
- wherein in formula (I)
- R1 is a hydrocarbyl radical selected from the group consisting of a C16 to C20 alkenyl group and a polyisobutenyl group having a number-average molecular weight of from 200 to 40,000,
- R6 is a hydrogen atom or a C1- to C4-alkyl radical, and
- R2, R3, R4 and R5 are each independently a hydrogen atom, a hydroxyl group or a hydrocarbyl group having from 1 to 3000 carbon atoms optionally substituted with one or more moieties selected from the group consisting of O, S and NR6
- R4 may optionally be a radical of formula Y:
- wherein
- R1, R2, R3 and R5 are each as defined above and X is a hydrocarbon bridging element which consists of one or more isobutene units or comprises one or more isobutene units, or
- R4 may also be a radical of formula Z or Z′
- wherein
- R1, R2, R3 and R5 are each as defined above and R10 and R11 are each independently hydrogen or a C1- to C10-alkyl radical,
- R2 and R3 or R3 and R4 or R4 and R5, together with the part-structure —O—CH2—NR7—CH2— attached to the benzene ring, optionally form a second tetrahydrooxazine ring, or the substituents R2 and R3 and R4 and R5, together with the part-structures —O—CH2—NR7—CH2- and —O—CH2—NR8—CH2— attached to the benzene ring, optionally form a second and a third tetrahydrooxazine ring, and
- R7 and R8 are each independently a hydrocarbyl group selected from the group consisting of a C16 to C20 alkenyl group and a polyisobutenyl group having a number-average molecular weight of from 200 to 40,000,
- with the proviso that R2, R3, R4, R5, when they are hydrocarbyl radicals, each have from 1 to 20 carbon atoms.
Dependencies are inferred from the claim text.