Union Oil Company of California

Diane M Dillon

Peter J Jessup

Michael C Croudace

Stephen G Brass

Ross Y Iwamoto

Hydrocarbon fuels heavier than gasoline, especially diesel fuel compositions, contain carbonate additives, preferably non-aromatic, metals-free carbonates, to reduce particulate emissions therefrom when combusted in an internal combustion engine.

Hydrocarbon fuel composition containing carbonate additive

Liquid hydrocarbon fuels, especially diesel fuels, are admixed with diesters of oxalic acid to produce liquid hydrocarbon fuel compositions having improved ignition quality and enhanced cetane numbers.

Composition for cetane improvement of diesel fuels

Hydrocarbon fuels with an improved cetane number are obtained by blending a liquid fuel with a cyclic ether compound. Cyclic ethers are compounds which have a ring structure of carbon and a minor number of oxygen atoms, including beta-lactones and adducts of the beta-lactones with aldehydes or ketones.

Cetane number

Liquid hydrocarbon fuels having an enhanced cetane number include at least one azo compound having the formula:

Cetane number improvement

Hydrocarbon fuels, especially diesel fuel compositions, contain cyclic aldehyde polymers and orthoesters to reduce particulate emissions therefrom when combusted in an internal combustion engine.

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Fullerton, CA, United States of America

Diane M Dillon