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US 5,711,767 AGranted
Stabilizers for the prevention of gum formation in gasoline
AssigneeCiba Specialty Chemicals Corporation
InventorsMatthew E. Gande, Paul A. Odorisio, Ramraj Venkatadri, Geoffrey W. Broadhurst
Life of this patent
Estimating the term…
Abstract
The use of nitroxide compounds alone or in combination with aromatic amines, such as substituted phenylenediamines, or phenolic antioxidants provides an effective way to prevent oxidative degradation and gum formation in gasolines, especially unstable coker and pyrolysis gasolines.
Claims41
A process for the prevention of oxidative degradation and gum or deposit formation in gasoline which comprises
- adding to gasoline subject to oxidative or thermal induced degradation an effective stabilizing amount of stabilizer system which is a nitroxide compound with the proviso that the nitroxide compound is not di-tert-butyl nitroxyl, 1-oxyl-2,2,6,6-tetramethylpiperidine or a diaryl nitroxide.
A composition stabilized against oxidative degradation and against the formation of gum or undesirable deposits which comprises
- (a) gasoline subject to oxidative degradation, and
- (b) an effective stabilizing amount of a stabilizer system which is a nitroxide compound, and
- with the proviso that the nitroxide is not di-tert-butyl nitroxyl, 1-oxyl-2,2,6,6-tetramethylpiperidine or a diaryl nitroxide.
Dependencies are inferred from the claim text.