Acid-free quaternized nitrogen compounds and use thereof as additives in fuels and lubricants

摘要

The present invention relates to novel acid-free quaternized nitrogen compounds, to the preparation thereof and to the use thereof as a fuel and lubricant additive, more particularly as a detergent additive, as a wax antisettling additive (WASA) or as an additive for reducing internal diesel injector deposits (IDID); to additive packages which comprise these compounds; and to fuels and lubricants thus additized. The present invention further relates to the use of these acid-free quaternized nitrogen compounds as a fuel additive for reducing or preventing deposits in the injection systems of direct-injection diesel engines, especially in common-rail injection systems, for reducing the fuel consumption of direct-injection diesel engines, especially of diesel engines with common-rail injection systems, and for minimizing power loss in direct-injection diesel engines, especially in diesel engines with common-rail injection systems.

主权项

1. A method for reducing or preventing deposits in an injection system of a diesel engine, the method comprising:
adding a deposit reducing or deposit preventing effective amount of a quaternized nitrogen compound to a fuel for the diesel engine in need thereof; and operating the diesel engine with the fuel having the quaternized nitrogen compound; wherein the quaternized nitrogen compound is a quaternized reaction product of a polycarboxylic acid anhydride compound with a compound comprising oxygen or nitrogen groups reactive with an anhydride, and a quaternizable amino group, the polycarboxylic acid anhydride compound comprises a hydrocarbyl substituent having a number-average molecular weight (Mn) in a range from about 200 to 20 000, wherein the method prevents or reduces internal diesel injector deposits of a direct injection diesel engine; and wherein the method prevents or reduces flow restriction in an indirect injection diesel engine as determined by the XUD 9 test method.