Patent ID: 9587194
Date: 2017-03-07
CPC Classifications: C07C,C07D,C10L,C10M,C10N

Claim:
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.