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US 4,385,904 AGranted
Novel corrosion inhibitor for alcohol fuels
AssigneeTexaco Inc.
InventorsRobert A. Sawicki, Benjamin J. Kaufman
Life of this patent
Estimating the term…
Abstract
Unsaturated cyclic keto acids bearing pendant alkyl groups may be prepared by rearranging substituted dicarboxylic acid anhydrides in the presence of a strong Bronsted acid catalyst. The products may be useful as corrosion inhibitors in alcohol fuels and as intermediates in chemical and additive manufacture.
Claims8
A fuel composition for internal combustion engines comprising
- (a) a major portion of a fuel containing (i) at least one alcohol selected from the group consisting of ethanol and methanol and (ii) gasoline in amount of 0-50 volumes per volume of alcohol;
- and
- (b) a minor wear-inhibiting amount of, as a wear inhibiting additive, a cyclized C.sub.3 -C.sub.20 alkenyl succinic acid anhydride.
A fuel composition for internal combustion engines comprising ethanol and a wear-inhibiting amount of 1-250 PTB, of a cyclic keto acid prepared by the process which comprises
- cyclizing a C.sub.3 -C.sub.20 alkenyl succinic acid anhydride at 69.degree. C.-145.degree. C. for 1-48 hours in the presence of strong Bronsted acid catalyst thereby forming a cyclic keto acid;
- and
- recovering said cyclic keto acid.
Dependencies are inferred from the claim text.