Fuel products
AssigneeThe Lubrizol Corporation
InventorsThomas E. Johnston, Dorer, Jr. Casper J.
Life of this patent
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Abstract
A fuel composition for internal combustion engines, and more particularly, a fuel composition for internal combustion engines containing less than about 0.5 gram of lead per gallon of fuel is described. The fuel provides acceptable valve seat protection in engines designed to operate on leaded or unleaded fuels. Ordinarily, leaded fuels contain components to reduce deposits within the engine cylinders which unleaded fuels do not. As leaded fuels become unavailable, some refiners will add valve protecting components to the unleaded fuels to satisfy the leaded market. Such fuels will then potentially cause an increase in the octane requirement. This invention deals with polybasic carboxylate additives having valve seat protection properties which avoid or minimize the octane requirement increase.
Claims21
A fuel composition comprising gasoline and at least one hydrocarbon-soluble or dispersible polybasic carboxylate salt of an alkali or alkaline earth metal and mixtures thereof.
A fuel composition comprising gasoline and a hydrocarbon-soluble or dispersible polybasic carboxylate salt containing a hydrocarbyl residue wherein the molecular weight of the anionic portion of the salt is from about 400 to about 2000.
The process of reducing valve seat recession in an engine without substantially increasing the octane requirement by introducing to the combustion chamber of the engine a product comprising:
- (A) a polybasic carboxylate salt;
- (B) a dispersant;
- and
- (C) gasoline the amount of the polybasic carboxylate salt being sufficient to reduce the valve seat recession.
A concentrate for use in preparing a fuel comprising an alkali metal or alkaline earth metal polybasic carboxylate salt and a hydrocarbon-soluble ashless dispersant.
Dependencies are inferred from the claim text.