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US 5,509,944 AGranted
Stabilization of gasoline and gasoline mixtures
AssigneeExxon Chemical Patents Inc.
InventorsRamray A. Venkatadri, R. G. Presenti
Life of this patent
Estimating the term…
Abstract
Gasoline and gasoline mixtures containing unsaturated hydrocarbons are stabilized by the addition thereto of an effective amount of (a) a primary antioxidant of a phenylenediamine, a hindered monophenol, or mixtures thereof, and (b) dimethyl sulfoxide.
Claims1
A method of treating gasoline containing unsaturated hydrocarbons to inhibit gum formation which comprises introducing into the gasoline from 10 to 100 ppm of antioxidant components comprising
- (a) from 80 to 99 wt % of a blend of a di-sec-butyl-p-phenylenediamine and a 2,4,6 tert. butyl phenol, and
- (b) from 1 to 20 wt % of dimethylsulfoxide, the sulfur of the dimethylsulfoxide being present in the gasoline at a concentration less than 5 ppm.
Dependencies are inferred from the claim text.