ATBECHDEFRGBITLILUNLSE0147240EUROPEAN PATENT APPLICATIONA319860402EP843091431984122856708919831230US56707119831230US56709019831230US1986040219861419850703198527 6C 10L 01/22 AenFuel compositions and additive concentrates, and their use in inhibiting engine cokingfrCompositions de combustibles et des concentrés d'additifs, et leur utilisations pour inhiber la formation de dépôtsdeBrennstoffzusammensetzungen und Zusatzkonzentrate und ihre Verwendung zur SchlamminhibitionETHYL CORPORATIONHanlon, John VincentATBECHDEFRGBITLILUNLSE19860402198614

Coking in and around the injector nozzles of indirect injection compression ignition engines is reduced by means of distillate fuel into which has been blended suitable concentrations of:

(a) organic nitrate ignition accelerator, and
(b) hydrocarbyl-substituted succinimide or succinamide, or
(a) organic nitrate ignition accelerator,
(c) hydrocarbyl amine having from 3 to 60 carbons and from 1 to 10 nitrogens, and
(d) N,N'-disalicylidene-1,2-diaminopropane, or
(b) hydrocarbyl-substituted succinimide or succinamide,
(c) hydrocarbyl amine having from 3 to 60 carbons and from 1 to 10 nitrogens, and
(d) N,N'-disalicylidene-1,2-diaminopropane.

Additive concetrates can be formulated using such additive combinations.