Unleaded aminated aviation gasoline exhibiting control of toluene insoluble deposits

An unleaded aminated high octane aviation gasoline having a MON of at least 98, having low deposit properties and good water separation properties comprising an unleaded aviation gasoline having a base MON of less than 98 and an effective amount of at least one aromatic amine effective to boost the MON of the base fuel to at least 98, the aromatic amine having the formula

• wherein Rx is C1-C10 alkyl, halogen or a mixture thereof, n is an integer of from zero to 3 provided that when n is 1 or 2 and Rx is alkyl it is in the meta and/or para position on the phenyl ring and up to about 1000 wppm active ingredient of an anti-deposit additive selected from the group consisting of high molecular weight hydrocarbyl amine, a high molecular weight hydrocarbyl substituted Mannich base and mixtures thereof wherein the high molecular weight hydrocarbyl group has a weight average molecular weight of about 400 to 2800 Mw, and optional carrier oil(s).

An aviation gasoline fuel additive concentrate useful for toluene insoluble deposit control comprising a deposit control additive selected from the group consisting of high molecular weight hydrocarbyl amine, high molecular weight hydrocarbyl succinimide high molecular weight hydrocarbyl substituted Mannich base and mixtures thereof, and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw, and at least one additional compound selected from antioxidant, a metal deactivator, toluene, a solvent and one or more aromatic amines of the formula:

• wherein Rx is selected from the group consisting of C1-C10 alkyl, halogen or a mixture thereof, n is an integer of from zero to 3 provided that when n is 1 or 2 and Rx is alkyl it is in the meta- and/or para-position on the phenyl ring.

A method for producing an aviation gasoline fuel additive concentrate useful for toluene insoluble deposit control in aviation gasoline comprising mixing a deposit control additive selected from the group consisting of high molecular weight hydrocarbyl amine, high molecular weigh hydrocarbyl succinimide high molecular weight hydrocarbyl substituted Mannich base and mixture thereof, and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw, with at least one additional additive selected from antioxidant, metal deactivator, solvent toluene and one or more aromatic amines of the formula

• wherein Rx is selected from the group consisting of C1-C10 alkyl, halogen or a mixture thereof, n is an integer of from zero to 3 provided that when n is 1 or 2 and Rx is alkyl it is in the meta- and/or para-position on the phenyl ring.

A method for providing an unleaded aminated aviation gasoline having a MON of at least 98 and low toluene insoluble deposit control which comprises providing for blending into an unleaded aviation gasoline comprising a base fuel having a MON of less than 98 and sufficient aromatic amine of the formula:

• wherein Rx is selected from the group consisting of C1-C10 alkyl, halogen or a mixture thereof, n is an integer of from zero to 3 provided that when n is 1 or 2 and Rx is alkyl it is in the meta- and/or para position on the phenyl ring to boost the MON of the fuel to at least 98, an anti-deposit formation additive selected from the group consisting of high molecular weigh hydrocarbyl amine, high molecule weight hydrocarbyl succinimide, high molecular weight hydrocarbyl substituted Mannich base, and mixtures thereof, and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw.

A method for providing an unleaded aviation gasoline having a MON of at least 98 and toluene insoluble deposit control properties which comprises providing for blending into an unleaded aviation gasoline having a MON of less than 98 which is intended for blending with an aromatic amine of the formula

• wherein Rx is selected from the group consisting of C1-C10 alkyl, halogen or a mixture thereof, n is an integer of from zero to 3 provided that when n is 1 or 2 and Rx is alkyl it is in the meta- and/or para position on the phenyl ring to boost the MON of the fuel to at least 98, a deposit control additive selected from the group consisting of high molecular weight hydrocarbyl amine high molecular weight hydrocarbyl succinimide, high molecular, weight hydrocarbyl substituted Mannich base, and mixtures thereof, and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw.

A method for providing an unleaded aviation gasoline having a MON of at least about 98 and toluene deposit control properties comprising providing for blending into an unleaded aviation gasoline having a MON of less than 98 a combination of an aromatic amine of the formula

• wherein Rx is selected from the group consisting of C1-C10 alkyl, halogen or a mixture thereof, n is an integer of from zero to 3 provided that when n is 1 or 2 and Rx is alkyl it is in the meta- and/or para position on the phenyl ring to boost the MON of the fuel to at least 98, and a deposit control additive selected from the group consisting of high molecular weight hydrocarbyl amine high molecular weight hydrocarbyl succinimide, high molecular weigh hydrocarbyl substitute Mannich base, and mixtures thereof, and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw.