Additives for sulphur-poor mineral oil distillates comprising an ester of an alkoxylated polyol and an alkylphenol-aldehye resin
An additive for middle distillates with a maximum sulfur content of 0.05 percent by weight, comprising at least one fatty acid ester of alkoxylated polyols with at least 3 OH groups (A) and at least one alkylphenol-aldehyde resin (C).
1. A middle distillate fuel composition having a maximum sulfur content of 0.05% by weight, comprising middle distillate fuel and at least one fatty ester of an alkxoylated polyol having at least 3 OH groups (A) and at least one alkyiphenol-aldehyde resin (C), wherein the at least one fatty acid ester has an OH number of less than 15 mg KOH/g.
2. A middle distillate fuel composition as claimed in claim 1 , wherein the at least one fatty ester of an alkoxylated polyol (A) is derived from a polyol having three or more OH groups and which has been reacted with from 1 to 100 mol of alkylene oxide.
3. A middle distillate fuel composition as claimed in claim 1 , wherein the at least one fatty ester of an alkoxylated polyol (A) has been esterified with a fatty acid having from 8 to 50 carbon atoms.
4. A middle distillate fuel composition as claimed in claim 1 wherein the at least one fatty ester of an alkoxylated polyol (A) has been esterified with a mixture of at least one fatty acid having from 8 to 50 carbon atoms and at least one fat-soluble, polybasic carboxylic acid.
5. A middle distillate fuel composition as claimed in claim 1 , wherein the at least one fatty ester of an alkoxylated polyol (A) is derived from glycerol.
6. A middle distillate fuel composition as claimed in claim 1 wherein the alkyl radicals of the alkyiphenol-aldehyde resin (C) have from 1 to 50 carbon atoms.
7. A middle distillate fuel composition as claimed in claim 1 , wherein the alkylphenol-aldehyde resin (C) is derived from at least one aldehyde having from 1 to 10 carbon atoms.
8. A middle distillate fuel composition as claimed in claim 1 , further comprising an ethylene copolymer.
9. A middle distillate fuel composition as claimed in claim 8 , wherein the ethylene copolymer contains at least one unsaturated vinyl ester of an aliphatic carboxylic acid having from 2 to 15 carbon atoms.
10. A middle distillate fuel composition as claimed in claim 8 , wherein the ethylene copolymer, contains from 10 to 40 mol % of comonomers.
11. A middle distillate fuel composition as claimed in claim 1 , further comprising a polar nitrogen-containing paraffin dispersant, wherein the dispersant includes amine salts and/or amides of secondary fatty amines having from 8 to 36 carbon atoms.
12. A method for improving the cold flow properties and paraffin dispersancy in a middle distillate fuel having a maximum sulfur content of 0.05% by weight comprising the step of adding an additive to the middle distillate fuel, wherein the additive includes at least one fatty ester of an alkoxylated polyol having at least 3 OH groups (A) and at least one alkyiphenol-aldehyde resin (C).