Indian Gasoline Quality and Requirement of Deposit Control Additives for Engine Intake System Cleanliness

Abstract

To meet the growing demand of gasoline, heavier ends of crude are being converted into distillate products through secondary refining processes such as fluid catalytic cracking (FCC), thermal cracking, etc. Present day gasoline in India consists of a mixture of unstable streams such as coker, FCC and visbreaker naphtha besides straight run (SR) naphtha and reformate, affecting the overall quality and stability of the fuel. Out of thirteen refineries in India, nine are equipped with FCC units. In these refineries, gasoline is composed of 50 to 90% of FCC stock. This paper presents data on Indian gasoline quality. Effectiveness of a number of commercially available multifunctional additives on carburettor and intake valve cleanliness was studied on gasolines from different refineries. In addition, the effect of these additives on engine performance and emissions is reported.