Methods and uses relating to fuel compositions
AssigneeInnospec Limited
InventorsJacqueline REID, Nigel John BROOM, Adele CROSS
Life of this patent
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Abstract
A method of removing deposits in a direct injection spark ignition engine, the method including combusting in the engine a gasoline fuel composition having a quaternary ammonium salt additive wherein the quaternary ammonium salt additive includes the quaternised reaction product of a hydrocarbyl substituted succinic acid derived acylating agent and a compound able to react with said acylating agent and which includes a tertiary amine group; in which each molecule of the hydrocarbyl substituted succinic acid derived acylating agent includes on average at least 1.2 succinic acid moieties.
Claims17
A method of removing deposits in a direct injection spark ignition engine, the method comprising combusting in the engine a gasoline fuel composition comprising a quaternary ammonium salt additive wherein the quaternary ammonium salt additive comprises the quaternised reaction product of a hydrocarbyl substituted succinic acid derived acylating agent and a compound able to react with said acylating agent and which includes a tertiary amine group;
- wherein each molecule of the hydrocarbyl substituted succinic acid derived acylating agent includes on average at least 1.2 succinic acid moieties.
The use of a combination of a quaternary ammonium salt additive in a gasoline fuel composition to remove deposits in a direct injection spark ignition engine;
- wherein the quaternary ammonium salt additive comprises the quaternised reaction product of a hydrocarbyl substituted succinic acid derived acylating agent and a compound able to react with said acylating agent and which includes a tertiary amine group;
- wherein each molecule of the hydrocarbyl substituted succinic acid derived acylating agent includes on average at least 1.2 succinic acid moieties.
Dependencies are inferred from the claim text.