This invention relates to a method for inhibiting the agglomeration of gas hydrates, comprising the injection of an anti-agglomerant comprising a N,N-dialkyl-ammoniumalkyl fatty acid amide represented by the formula (I) ##STR00001##
wherein R.sup.1 is an alkyl or alkenyl group having from 7 to 21 carbon atoms, R.sup.2 and R.sup.3 are each independently an alkyl group containing 1 to 10 carbon atoms, or together form an optionally substituted ring having 5 to 10 ring atoms, wherein the ring may carry up to 3 substituents, R.sup.4 is hydrogen or an alkyl group having 1 to 6 carbon atoms, R.sup.5 is hydrogen or an optionally substituted hydrocarbyl group having 1 to 22 carbon atoms and A is an alkylene group having two or three carbon atoms,
into a fluid comprising gas, water and oil under conditions prone to the formation of gas hydrates,
wherein the N,N-dialkyl-ammoniumalkyl fatty acid amide represented by formula (I) is produced by the aminolysis of an ester of a fatty acid and a C.sub.1- to C.sub.4-alcohol with an N,N-dialkylamino alkyl amine and subsequent neutralization with a carboxylic acid.

Lubricity additives for hydrocarbon fuels are presented according to formula I:
R.sup.1[(—O—R.sup.2).sub.n-Q].sub.p  (I)
wherein p is 3 or greater; each n is independently selected from integers equal to 2 or greater; R.sup.1 is a C3-C20 aliphatic hydrocarbon group of valence p which is branched or linear and which is substituted or unsubstituted; each R.sup.2 is independently selected from C2-C20 divalent aliphatic or aromatic hydrocarbon groups which are branched or linear and which are substituted or unsubstituted; and each Q is independently selected from —NH.sub.2 or a moiety according to formula II: ##STR00001##
wherein each R.sup.3 is independently selected from C8-C60 alkenyl groups which are substituted or unsubstituted, providing that at least one Q is the moiety according to formula II.

The present invention relates to the use, for improving the detergency properties of a liquid fuel composition comprising one or more detergent additives, of an additive consisting of one or more hydrocarbon compound(s) comprising from 2 to 10 carbon atoms and two hydroxyl functions.

The present invention also relates to a method for improving the cleanliness of and/or for cleaning at least one inner portion of an internal combustion engine supplied with a liquid fuel comprising one or more detergent additives, wherein such a hydrocarbon compound is added to the fuel composition.

Lubricity additives for hydrocarbon fuels are presented according to formula I:

R.sup.1[(—O—R.sup.2).sub.n-Q].sub.p  (I)

wherein p is 3 or greater; each n is independently selected from integers equal to 2 or greater; R.sup.1 is a C3-C20 aliphatic hydrocarbon group of valence p which is branched or linear and which is substituted or unsubstituted; each R.sup.2 is independently selected from C2-C20 divalent aliphatic or aromatic hydrocarbon groups which are branched or linear and which are substituted or unsubstituted; and each Q is independently selected from —NH.sub.2 or a moiety according to formula II:

##STR00001##

wherein each R.sup.3 is independently selected from C8-C60 alkenyl groups which are substituted or unsubstituted, providing that at least one Q is the moiety according to formula II.

The present invention relates to a low-temperature additive for fuel oils having a sulfur content of less than 50 ppm, comprising i) at least one oil-soluble amide-ammonium salt of a polycarboxylic acid with a mono- and/or dialkylamine (A) and ii) 5-100% by weight, based on the amount of amide-ammonium salt (A), of an oil-soluble amine (B), and iii) 0.1 to 10 parts by weight, based on the amount of amide-ammonium salt (A), of a resin formed from at least one aromatic compound bearing an alkyl radical and an aldehyde and/or ketone (D).

The present invention relates to a low-temperature additive for fuel oils having a sulfur content of less than 50 ppm, comprising i) at least one oil-soluble amide-ammonium salt of a polycarboxylic acid with a mono- and/or dialkylamine (A) and ii) 5-100% by weight, based on the amount of amide-ammonium salt (A), of an oil-soluble amine (B), and iii) 0.1 to 10 parts by weight, based on the amount of amide-ammonium salt (A), of a resin formed from at least one aromatic compound bearing an alkyl radical and an aldehyde and/or ketone (D).

The present invention relates to performance enhancing additive composition comprising a mixture or a blend of (i) an acid amide; and (ii) oxide treated derivative of amine in one embodiment, and performance enhancing additive composition comprising a mixture or a blend of (i) an acid amide; and (ii) oxide treated derivative of amine, and further comprising a detergent in another embodiment, and to a fuel compositions thereof in still another embodiment, and to method of use thereof in yet another embodiment, and to a method of improving performance of a fuel and an engine in yet another embodiment.

Disclosed are succinimide-based compounds used in compositions and methods for inhibiting natural gas hydrate agglomerates. The succinimide-based compounds are reaction products of an alkenyl succinic anhydride and an amine or amine alcohol.

A fuel composition comprising a fuel and a lubricity additive where the lubricity additive is selected from (1) 1-Lauroyl-rac-glycerol, (2) Dodecanamide, N-hydroxy-, or (3) 2-Ethylhexanoic acid and the fuel is gasoline.

A fuel composition comprising a fuel and a lubricity additive where the lubricity additive is selected from (1) 1-Lauroyl-rac-glycerol, (2) Dodecanamide, N-hydroxy-, or (3) 2-Ethylhexanoic acid and the fuel is gasoline.