Fuel additive compositions and distillate fuels containing same
AssigneeEquistar Chemicals, LP
InventorMaged G. Botros
Life of this patent
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Abstract
Improved fuel additives and distillate fuels containing said additives are described. The additives impart improved low temperature flow and filterability and also impart stability to distillate fuels, particularly hard-to-treat distillate fuels. The additives are a combination of an olefin/vinyl carboxylate polymer and two specific polyimides having different alkyl substituents.
Claims20
A distillate fuel composition having improved stability and low temperature flow and filterability comprising a major portion of a distillate fuel and 100 to 5000 ppm of an additive composition comprising:
- (a) an olefin/vinyl carboxylate polymer selected from the group consisting of ethylene/vinyl acetate copolymers;
- ethylene/vinyl acetate/isobutylene terpolymers and mixtures thereof;
- (b) a first polyimide corresponding to the general formula:
- where R1 is an alkyl group with an average carbon number of 22 to 26 carbon atoms and n1 is from about 1.5 to 8;
- and
- (c) a second polyimide corresponding to the general formula
- where R2 is an alkyl group with an average carbon number greater than 30 and n2 is from about 1.5 to 8.
A fuel additive composition for improving the low temperature flow and filterability of distillate fuels comprising:
- (a) an olefin/vinyl carboxylate polymer selected from the group consisting of ethylene/vinyl acetate copolymers;
- ethylene/vinyl acetate/isobutylene terpolymers and mixtures thereof;
- (b) a first polyimide corresponding to the general formula:
- where R1 is an alkyl group with an average carbon number of 22 to 26 carbon atoms and n1 is from about 1.5 to 8;
- and
- (c) a second polyimide corresponding to the general formula
- where R2 is an alkyl group with an average carbon number greater than 30 and n2 is from about 1.5 to 8;
- said first polyimide and said second polyimide present at a weight ratio of 1:5 to 5:1 and the weight ratio of olefin/vinyl carboxylate polymer to the combined weight of said first and second polyimides ranging from 4:1 to 1:4.
Dependencies are inferred from the claim text.