Gasoline composition, method and use
A gasoline composition comprising, as an additive, one or more quaternary ammonium salt(s) (i) formed by the reaction of a compound of formula (A): and a compound formed by the reaction of a hydrocarbyl-substituted acylating agent and an amine of formula (B1) or (B2): wherein R is an optionally substituted alkyl, alkenyl, aryl or alkylaryl group; R 1 is an alkyl, aryl or alkylaryl group having up to 36 carbon atoms; R 2 and R 3 are the same or different alkyl groups having from 1 to 36 carbon atoms; X is an alkylene group having from 1 to 20 carbon atoms; n is from 0 to 20; m is from 1 to 5; and R 4 is hydrogen or a C 1 to C 36 alkyl group.
1. A gasoline composition comprising, as an additive, one or more quaternary ammonium salt(s) (i) formed by the reaction of a compound of formula (A):
and a compound formed by the reaction of a hydrocarbyl-substituted acylating agent and an amine of formula (B1) or (B2):
wherein R is an optionally substituted alkyl, alkenyl, aryl or alkylaryl group; R 1 is an alkyl, aryl or alkylaryl group having up to 36 carbon atoms; R 2 and R 3 are the same or different alkyl groups having from 1 to 36 carbon atoms; X is an alkylene group having from 1 to 20 carbon atoms; n is from 0 to 20; m is from 1 to 5; and R 4 is hydrogen or a C 1 to C 36 alkyl group.
2. A gasoline composition according to claim 1 wherein the compound of formula (A) is an ester of a carboxylic acid having a pK a of 3.5 or less.
3. A gasoline composition according to claim 1 wherein the quaternary ammonium salt(s) are formed by the reaction of a compound of formula (A) and a compound formed by the reaction of a hydrocarbyl-substituted acylating agent and an amine of formula (B1).
4. A gasoline composition according to claim 1 wherein the hydrocarbyl-substituted acylating agent is polyisobutenyl substituted succinic anhydride.
5. A gasoline composition according to claim 1 further comprising one or more additives selected from the group consisting of:
a) carrier oils;
b) acylated nitrogen compounds which are the reaction product of a carboxylic acid-derived acylating agent and an amine;
c) hydrocarbyl-substituted amines wherein the hydrocarbyl substituent is substantially aliphatic and contains at least 8 carbon atoms;
d) Mannich base additives comprising nitrogen-containing condensates of a phenol, aldehyde and primary or secondary amine; and
e) aromatic esters of a polyalkylphenoxyalkanol.
6. A gasoline composition according to claim 5 wherein component (a) is selected from the group consisting of polyethers and polyetheramines.
7. A gasoline composition according to claim 5 wherein component (d) comprises the reaction product of formaldehyde, an ethylene or polyethylene polyamine, and para-substituted monoalkyl phenol.
8. An additive package which upon addition to gasoline provides a composition as claimed in claim 1 .
9. A method of improving the performance of a gasoline engine comprising adding to gasoline one or more quaternary ammonium salt(s) formed by the reaction of a compound of formula (A):
and a compound formed by the reaction of a hydrocarbyl-substituted acylating agent and an amine of formula (B1) or (B2):
wherein R is an optionally substituted alkyl, alkenyl, aryl or alkylaryl group; R 1 is an alkyl, aryl or alkylaryl group having up to 36 carbon atoms; R 2 and R 3 are the same or different alkyl groups having from 1 to 36 carbon atoms; X is an alkylene group having from 1 to 20 carbon atoms; n is from 0 to 20; m is from 1 to 5; and R 4 is hydrogen or a C 1 to C 36 alkyl group; and combusting the additised gasoline.
10. A method of controlling deposits in a gasoline engine comprising adding to gasoline one or more quaternary ammonium salt(s) formed by the reaction of a compound of formula (A):
and a compound formed by the reaction of a hydrocarbyl-substituted acylating agent and an amine of formula (B1) or (B2):
wherein R is an optionally substituted alkyl, alkenyl, aryl or alkylaryl group; R 1 is an alkyl, aryl or alkylaryl group having up to 36 carbon atoms; R 2 and R 3 are the same or different alkyl groups having from 1 to 36 carbon atoms; X is an alkylene group having from 1 to 20 carbon atoms; n is from 0 to 20; m is from 1 to 5; and R 4 is hydrogen or a C 1 to C 36 alkyl group; and combusting the additised gasoline.
11. A method according to claim 10 , wherein said controlling deposits comprises reducing existing deposits or reducing deposit formation.
12. A method according to claim 9 , where the gasoline engine is a direct injection spark ignition gasoline engine.
13. A method of controlling deposits and/or of improving the efficiency in a spark ignition gasoline engine, the method comprising adding into the gasoline to be combusted:
(i) one or more quaternary ammonium salt(s) as defined in claim 1 , and
(ii) optionally, one or more additional components selected from a)-e) as defined in claim 5 .