Process for improving the cold-flow properties of fuel oils

Details Process for improving the cold-flow properties of fuel oils Process for improving the cold-flow properties of fuel oils

C - Chemistry, Metallurgy

10

L

C10L 1/195 (2006.01) C10L 1/197 (2006.01) C10M 145/12 (2006.01)

Patent

CA 2260169

Process for improving the cold-flow properties of fuel oils The invention relates to a process for improving the cold-flow properties of fuel oils having a sulfur content of less than 500 ppm and a content of n-paraffins having a chain length of C18 or longer of at least 8% by weight, comprising adding an additive comprising a mixture of either A1) from 15 to 50% by weight of a copolymer of lower olefins and vinyl esters, comprising a) up to 96 mol% of divalent structural units of the formula 1 (SEE FORMULA 1) in which R1 and R2, independently of one another, are hydrogen or methyl, and b) from 4 to 10 mol% of divalent structural units of the formula 2 (SEE FORMULA 2) in which R3 is saturated, branched C6-C16-alkyl which contains a tertiary carbon atom, or, alternatively to Al) A2) from 15 to 50% by weight of a copolymer of lower olefins and vinyl esters, comprising a) up to 96 mol% of divalent structural units of the formula 1 (SEE FORMULA 1) in which R1 and R2, independently of one another, are hydrogen or methyl, and b) from 1 to 10 mol% of divalent structural units of the formula 2 (SEE FORMULA 2) in which R3 is saturated, branched C6-C16-alkyl which contains a tertiary carbon atom, and c) up to 10 mol% of divalent structural units of the formula 3 (SEE FORMULA 3) where the sum of the molar proportions of structural units of the formulae 2 and 3 is between 4 and 12 mol%, and B) from 85 to 50% by weight of at least one further copolymer or terpolymer of ethylene and vinyl esters or acrylates which is per se a cold-flow improver. The invention furthermore relates to additives for improving the cold-flow behavior of mineral oils and mineral-oil distillates, and to fuel oils containing such additives.

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