Unleaded aminated aviation gasoline exhibiting control of toluene insoluble deposits
AssigneeExxonMobil Research and Engineering Company
InventorsRoger Grant Gaughan, Daniel Dawson Lowrey, Daniel Eugene Kadlecek, Dennis Harold Hoskin
Life of this patent
Estimating the term…
Abstract
The present invention relates to an unleaded aminated aviation gasoline of high motor octane number (MON) and low toluene insoluble deposit formation containing an additive for controlling said deposits selected from the group consisting of high molecular weight hydrocarbyl amines, high molecular weight hydrocarbyl succinimide, high molecular weight hydrocarbyl substituted Mannish bases, and mixtures thereof, and optional carrier oil(s), to an additive concentrate for controlling toluene insoluble deposits, and to a method for producing the additive concentrate.
Claims41
A method for reducing the level of toluene insolubles in aminated unleaded aviation gasoline while retaining good water shedding properties wherein such unleaded aminated aviation gasoline comprises (i) an unleaded aviation gasoline having a base MON of less than 98, and (ii) an amount of at least one aromatic amine effective to boost the motor octane number of the base fuel to at least 98, the aromatic amine having the formula
- wherein Rx is C1-C10 alkyl, a halogen or a mixture thereof, n is an integer from zero to 3 and wherein when n is 1 or 2 and Rx is an alkyl group, the alkyl group occupies the meta and/or para position on the phenyl ring, by adding to such aminated unleaded aviation gasoline up to about 1000 wppm of a deposit control additive selected from the group consisting of high molecular weight hydrocarbyl amine, and mixtures of 2-6 ditertbutyl hydroxy toluene (BHT) and N,N disalicylidene-1,2 propane diamine (MDA) wherein the high molecular weight hydrocarbyl group has a weight average molecular weight of about 400-2800 Mw, and optional carrier oil(s), and wherein said unleaded animated aviation gasoline is characterized by toluene insoluble deposits of 0.8 mg or less measured by a test in which a metal nub is cycled between 150° C. and 300° C. in 9 minute cycles while about 40 ml of the aminated unleaded aviation gasoline is dripped on the nub in an air atmosphere, the nub weighed to five decimal places (0.00001 g) before and after the aminated unleaded gasoline aviation gasoline is dripped onto it, the nub then being washed with n-heptane and weighed and with toluene and weighed to determine the toluene insoluble deposits and water shedding properties as determined by MSEP/water shedding test method ASTM D3948 Rev. A setting B using the yellow cell of at least 70.
An unleaded aminated high octane aviation gasoline having a MON of at least 98 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 and mixtures of 2-6 ditertbutyl hydroxy toluene (BHT) and N,N disalicylidene-1,2 propane diamine (MDA) wherein the high molecular weight hydrocarbyl group has a weight average molecular weight of about 400 to 2800 Mw, and optional carrier oil(s), and wherein said unleaded aminated high octane aviation gasoline is characterized by toluene insoluble deposits of no more than 0.06 mg measured by a test in which a metal nub is cycled between 150° C. and 300° C. in 9 minute cycles while about 40 ml of the aminated unleaded aviation gasoline is dripped on the nub in an air atmosphere, the nub weighed to five decimal places (0.00001 g) before and after the aminated unleaded aviation gasoline is dripped onto it, the nub then being washed with n-heptane and weighed and with toluene and weighed to determine the toluene insoluble deposits, and water separation property as determined by MSEP/water shedding test method ASTM D3948 Rev. A setting B using the yellow cell of at least 70.
An aviation gasoline fuel additive concentrate comprising a deposit control additive selected from the group consisting of high molecular weight hydrocarbyl amine and mixtures of 2-6 ditertbutyl hydroxy toluene (BHT) and N,N disalicylidene-1,2 propane diamine (MDA) 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:
- it is in the meta- and/or para-position on the phenyl ring wherein upon addition of the concentrate to aviation gasoline an additized aviation gasoline is produced characterized by toluene insoluble deposits of no more than 0.06 mg measured by a test in which a metal nub is cycled between 150° C. and 300° C. in 9 minute cycles while about 40 ml of the additized aviation gasoline is dripped on the nub in an air atmosphere, the nub weighed to five decimal places (0.0001 g) before and after the additized aviation gasoline is dripped onto it, the nub then being washed with n-heptane and weighed and with toluene and weighed to determine the toluene insoluble deposits, and water separation property as determined by MSEP/water shedding test method ASTM D3948 Rev. A setting B using the yellow cell of at least 70.
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, and mixtures of 2-6 ditertbutyl hydroxy toluene (BHT) and N,N disalicylidene-1,2 propane diamine (MDA) and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw, wherein the unleaded aminated aviation gasoline is characterized by toluene insoluble deposits of no more than 0.06 mg measured by a test in which a metal nub is cycled between 150° C. and 300° C. in 9 minute cycles while about 40 ml of the unleaded aminated aviation gasoline is dripped on the nub in an air atmosphere, the nub weighed to five decimal points (0.0001 g) before and after the unleaded aminated aviation gasoline is dripped onto it, the nub then being washed with n-heptane and weighed and with toluene and weighed to determine toluene insoluble deposits, and water separation property as determined by MSEP/water shedding test method ASTM D3948 Rev. A setting B using the yellow cell of at least 70.
A method for providing an unleaded aviation gasoline having a MON of at least 98 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 and mixtures of 2-6 ditertbutyl hydroxy toluene (BHT) and N,N disalicylidene-1,2 propane diamine (MDA) and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw, wherein the unleaded aminated aviation gasoline is characterized by toluene insoluble deposits of no more than 0.06 mg measured by a test in which a metal nub is cycled between 150° C. and 300° C. in 9 minute cycles while about 40 ml of the unleaded aminated aviation gasoline is dripped on the nub in an air atmosphere, the nub weighed to five decimal points (0.0001 g) before and after the unleaded aminated aviation gasoline is dripped onto it, the nub then being washed with n-heptane and weighed and with toluene and weighed to determine toluene insoluble deposits, and water separation property as determined by MSEP/water shedding test method ASTM D3948 Rev. A setting B using the yellow cell of at least 70.
A method for providing an unleaded aviation gasoline having a MON of at least about 98 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, a deposit control additive selected from the group consisting of high molecular weight hydrocarbyl amine, and mixtures of 2-6 ditertbutyl hydroxy toluene (BHT) and N,N disalicylidene-1,2 propane diamine (MDA) and optional carrier oil(s) wherein the high molecular weight hydrocarbyl substituent has a weight average molecular weight of about 400 to 2800 Mw, wherein the unleaded aminated aviation gasoline is characterized by toluene insoluble deposits of no more than 0.06 mg measured by a test in which a metal nub is cycled between 150° C. and 300° C. in 9 minute cycles while about 40 ml of the unleaded aminated aviation gasoline is dripped on the nub in an air atmosphere, the nub weighed to five decimal points (0.0001 g) before and after the unleaded aminated aviation gasoline is dripped onto it, the nub then being washed with n-heptane and weighed and with toluene and weighed to determine toluene insoluble deposits, and water separation property as determined by MSEP/water shedding test method ASTM D3948 Rev. A setting B using the yellow cell of at least 70.
Dependencies are inferred from the claim text.