USING POLYNUCLEAR PHENOL COMPOUNDS AS STABILISERS Russian patent published in 2012 - IPC C10L1/2383 

FIELD: power engineering.

SUBSTANCE: polynuclear phenol compounds, having up to 20 benzol nuclei per molecule, are produced by interaction of tetrahydrobenzoxazine of formula I with one or several identical or different phenols of formula II (I) (II) R¹ means a residue of hydrocarbyl having from 1 to 3000 atoms of carbon, which may be interrupted by one or more several heteroatoms from the group O or S and/or one or several groups NR⁶, where R⁶ means atom of hydrogen or residue of alkyl, having from 1 to 4 atoms of carbon. R², R³, R⁴ and R⁵ independently on each other mean atoms of hydrogen, groups of hydroxyl or remains of hydrocarbyl, having accordingly from 1 to 3000 atoms of carbon, which may be interrupted by one or several heteroatoms from the group O or S and/or one or several groups NR⁶, where R⁶ has the above value. R⁷, R⁸, R⁹ and R¹⁰ independently on each other mean atoms of hydrogen, groups of hydroxyl or remains of hydrocarbyl, having accordingly from 1 to 3000 atoms of carbon, which may be interrupted by one or several heteroatoms from the group O or S and/or one or several groups NR⁶, where R⁶ has the above value. R⁴ may also mean residue of the formula Z, and the substitute R⁹ also may mean the residue of the formula Z' (Z) (Z'), in which values of substitutes R¹, R², R³, R⁵, R⁷, R⁸ and R¹⁰ are as mentioned above. R⁷ may also stand for residue being a derivative from tetrahydrobenzoxazine of the general formula I. R¹⁵ means hydrogen or residue being a derivative from tetrahydrobenzoxazine of the general formula I. Substitutes R¹¹ and R¹² may be identical or different and mean an atom of hydrogen or alkyl residue having from 1 to 10 atoms of carbon, and in which substitutes R² and R³ or R³ and R⁴ or R⁴ and R⁵ with partial structure -O-CH₂-NR¹³-CH₂-, connected to a benzol nucleus may also form one second ring of tetrahydrobenzaxazine. Or substitutes R² and R³ and R⁴ and R⁵ with partial structures -O-CH₂-NR¹³-CH₂- and -O-CH₂-NR¹⁴-CH₂-, connected to a benzol nucleus, may also form one second and one third ring of tetrahydrobenzoxazine. At the same time R¹³ and R¹⁴ independently on each other mean atoms of hydrocarbyl, having accordingly from 1 to 3000 atoms of carbon, which may be interrupted by one or several heteroatoms from the group O or S and/or one or several groups NR⁶, where R⁶ has the above value. At least one of substitutes R¹, R², R³, R⁴, R⁵, R⁷, R⁸, R⁹, R¹⁰, R¹³ or R¹⁴ represents residue of polyisobutenyl with average non-numeric molecular weight M_n from 183 to 42000, and other substitutes from the group R¹, R², R³, R⁴, R⁵, R⁷, R⁸, R⁹, R¹⁰, R¹³ or R¹⁴, if they mean hydrocarbyl remains, have accordingly from 1 to 20 carbon atoms. Produced compounds are applied as antioxidants in jet fuel. Also a composition is proposed for a jet fuel, and at least one polynuclear phenol compound, excluding N-3-(dimethyl aminopropyl)-N,N-bis(2-hydroxy-5-polyiso-butenyl-benzene)-amine used as antioxidant. And a concentrate of additives is proposed for jet fuel, which contains at least one polynuclear phenol compound as an antioxidant, and if necessary, at least one dissolvent and at least one additive.

EFFECT: improved thermal stability of jet fuel.

9 cl, 11 ex