Combination of ethylene polymer, polymer having alkyl side chains, and nitrogen containing compound to improve cold flow properties of distillate fuel oils
AssigneeExxon Research & Engineering Co.
InventorNicholas Feldman
Life of this patent
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Abstract
Oil soluble combinations of (A) ethylene polymer or copolymer, (B) a second polymer having alkyl side chains of 6 to 30 carbon atoms, and derived from carboxylic acid esters and/or olefins, and (C) nitrogen compounds, such as amides, amine salts and ammonium salts, of carboxylic acids or anhydrides, are useful in improving the cold flow properties of distillate hydrocarbon fuel oils.
Claims19
A wax-containing petroleum fuel oil comprising a major proportion of a distillate oil boiling in the range of 120.degree. to 500.degree. C., which fuel oil has been improved in its low temperature flow properties, containing in the range of about 0.001 to 0.5 wt. %, based on the weight of the total composition, of a flow improving combination of:
- (A) one part by weight of an oil-soluble ethylene backbone distillate flow improving polymer having a number average molecular weight in the range of about 500 to 50,000;
- (B) 0.1 to 10 parts by weight of a second oil-soluble polymer of monomers other than ethylene, having a molecular weight in the range of about 1000 to 200,000 wherein at least 10% by weight of said polymer is in the form of straight chain alkyl groups having 6 to 30 carbon atoms, said polymer comprising unsaturated ester, or unsaturated ester and olefin, monomer moieties, said moieties comprising a major weight proportion of said polymer;
- and
- (C) 0.01 to 10 parts by weight of an oil soluble nitrogen compound containing a total of about 30 to 300 carbon atoms and having at least one straight chain alkyl segment of 8 to 40 carbons, and selected from the class consisting of amine salts and/or amides of hydrocarbyl carboxylic acids or anhydrides having 1 to 4 carbonyl groups.
An additive concentrate useful for treating distillate fuel oils comprising about 30 to 80 wt. % of a diluent oil and about 70 to 20 wt. % of an additive combination of:
- (A) one part by weight of an oil-soluble ethylene backbone distillate flow improving polymer having a number average molecular weight in the range of about 500 to 50,000;
- (B) 0.1 to 10 parts by weight of a second oil-soluble polymer of monomers other than ethylene having a molecular weight in the range of about 1000 to 200,000 wherein at least 10% by weight of said polymer is in the form of straight chain alkyl groups having 6 to 30 carbon atoms, said polymer comprising unsaturated ester, or unsaturated ester and olefin, monomer moieties, said moieties comprising a major weight proportion of said polymer;
- and
- (C) 0.1 to 10 parts by weight of an oil-soluble nitrogen compound containing a total of about 30 to 300 carbon atoms and selected from the class consisting of amine salts and/or amides of a C.sub.4 to C.sub.30 hydrocarbyl carboxylic acid or anhydride having 1 to 4 carbonyl groups, said compound having at least one straight chain alkyl segment of 8 to 40 carbon atoms.
Dependencies are inferred from the claim text.