A composition comprising a distillate fuel, an oligomer portion comprising at least one dimethoxymethane oligomer, and a stabilizer comprising one or more alcohols. A composition comprising a distillate fuel, and an oligomer portion comprising at least one dimethoxymethane oligomer, DMMn, wherein n is less than 3 and/or greater than 4. A composition comprising a distillate fuel, and less than 10 volume percent of an oligomer portion, wherein the oligomer portion comprises at least one dimethoxymethane oligomer. A method comprising separating, from a mixture of DMMn oligomers, one or more DMMn fractions comprising oligomers of a desired chain length n, and combining a desired amount of one or more of the separated DMMn fractions with a distillate fuel to provide a fuel composition. A composition comprising a distillate fuel that includes renewable distillate fuel, DMMn and/or alcohol.

This invention relates to compositions and a process for stabilizing or improving the solubility of a phenolic resin containing a mixture of linear phenolic resins and calixarenes in a hydrocarbon solvent. This invention also relates to a paraffin-containing fluid composition comprising this stabilized (solubilized) calixarene resin. The invention also relates to methods for dispersing paraffin crystals, inhibiting paraffin crystal deposition, or treating a well or vessel to reduce the deposition of paraffin crystals, with a resin composition containing this stabilized (solubilized) calixarene resin.

This invention relates to a paraffin-containing fluid composition comprising a phenolic resin containing one or more calixarene compounds (i.e., a calixarene resin). The invention also relates to methods for dispersing paraffin crystals, inhibiting paraffin crystal deposition, or treating a well or vessel to reduce the deposition of paraffin crystals, with a calixarene resin.

Provided are water-based fuel additive compositions that, when combusted with a fuel containing vanadium in a gas turbine, inhibit vanadium hot corrosion in the gas turbine. The water-based fuel additive compositions include at least one rare earth element compound or alkaline earth element compound that retards vanadium corrosion resulting from combustion of vanadium rich fuel.

Provided are oil-based fuel additive compositions that, when combusted with a fuel containing vanadium in a gas turbine, inhibit vanadium hot corrosion in the gas turbine. The oil-based fuel additive compositions include at least one rare earth element compound or alkaline earth element compound that retards vanadium corrosion resulting from combustion of vanadium rich fuel.

Use of a hydrocarbyl-substituted dicarboxylic acid for improving or boosting the separation of water from fuel oils and gasoline fuels which comprise additives with detergent action. A Fuel additive concentrate comprising the said hydrocarbyl-substituted dicarboxylic acid, certain additives with detergent action and optionally other customary additives and solvents or diluents.

Use of a hydrocarbyl-substituted dicarboxylic acid for improving or boosting the separation of water from fuel oils and gasoline fuels which comprise additives with detergent action. A Fuel additive concentrate comprising the said hydrocarbyl-substituted dicarboxylic acid, certain additives with detergent action and optionally other customary additives and solvents or diluents.

A composition including a pyrolysis oil and, as an additive, one or more of: (a) an aldehyde-alkylphenol copolymer and/or an aldehyde-alkylphenol-polyamine copolymer, wherein the alkylphenol of the copolymer comprises an alkyl group having at least 30 carbon atoms; and (b) the reaction product of an alcohol and/or amine with a copolymer of an alpha-olefin and an ethylenically unsaturated carboxylate compound, wherein the alpha-olefin and/or the alcohol and/or amine has at least 30 carbon atoms. A method of reducing the pour point of a composition including a pyrolysis oil and a use of the aforementioned additives for reducing the pour point of a composition comprising a pyrolysis oil, are also disclosed.

Disclosed are multifunctional compounds represented by structural formula (I):

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methods of producing compounds represented by structural formula (I) and their use in inhibiting corrosion in corrodible material.

A diesel fuel composition comprising a first additive (i) comprising a quaternary ammonium salt and a second additive (ii) comprising a Mannich reaction product; wherein the quaternary ammonium salt additive (i) is formed by the reaction a quaternising agent which is not an ester and a compound formed by the reaction of a hydrocarbyl-substituted acylating agent and an amine of formula (B1) or (B2): wherein R.sup.2 and R.sup.3 are the same or different alkyl, alkenyl or aryl groups having from 1 to 22 carbon atoms; X is a bond or alkylene group having from 1 to 20 carbon atoms; n is from 0 to 20; m is from 1 to 5; and R.sup.4 is hydrogen or a C.sub.1 to C.sub.22 alkyl group; and wherein the Mannich reaction product additive (ii) is the product of a Mannich reaction between: (d) an aldehyde; (e) an amine; and (f) a substituted phenol; wherein the phenol is substituted with at least one branched hydrocarbyl group having a molecular weight of between 200 and 3000.