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US 4,233,035 AGranted
Additives for aviation and similar fuels
AssigneeNational Research Development Corporation
InventorsEdward A. Allen, Peter C. Phillips, Terence Smithson
Life of this patent
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AssigneeNational Research Development Corporation
InventorsEdward A. Allen, Peter C. Phillips, Terence Smithson
Estimating the term…
A hydrocarbon fuel, especially a copper-sweetened aviation jet fuel, contains a metal deactivator which is an oxime of either an orthohydroxy aromatic ketone or .alpha.-hydroxy aliphatic ketone, or an imine of a diamine with an ortho hydroxy aromatic ketone, an alkyl substituted ortho hydroxy aromatic aldehyde or a -diketone. Preferred materials include oximes of 2-hydroxy-5-t-butyl benzophenone and 2-hydroxy-5-nonyl acetophenene and di-imines of ethylene and propylene diamines with benzoyl acetone, 5-t-octylsalicylaldehye or 2-hydoroxy-5-methyl butyrophenone. The metal de-activator is added in conventional proportions, typically about 5 to 10 ppm (by weight) to the fuel which may contain either conventional additives such as anti-static, anti-icing and corrosion inhibiting additives.
A hydrocarbon fuel containing a metal de-activator which is a hydroxy oxime having the formula ##STR13## wherein R.sup.1 represents an alkyl group or a benzenoid aromatic group, R.sup.2 represents an orthohydroxy benzenoid aromatic group or an .alpha.-hydroxy group having the formula ##STR14## wherein R.sup.4 represents an alkyl or benzenoid aromatic group;
A hydrocarbon fuel containing a metal de-activator which is a ketimine of a .beta.-diketone and a diamine having the formula ##STR17## wherein R.sup.1 and R.sup.3 represent alkyl or benzenoid aromatic groups, R.sup.2 and R.sup.4 represent phenyl or alkyl substituted phenyl groups, R.sup.6 and R.sup.7 represent alkyl groups or hydrogen atoms and R.sup.5 represents an alkylene group, a cycloalkylene group, a benzenoid aromatic group, or an alkyl substituted derivative thereof.
A hydrocarbon fuel containing a metal de-activator which is a di-imine of a substituted salicylaldehyde and a diamine having the formula ##STR18## wherein R.sup.1 and R.sup.2 represent alkyl groups containing from 6 to 20 carbon atoms and R.sup.3 represents a hydrogen atom or a methyl group.
Dependencies are inferred from the claim text.