Use of organotin compounds and ethers for improving gasoline octane number

Abstract

Synthesis of tetrahexyltin by Grignard method gave pure product with 88.55% yield based on stannic chloride. Octane number determination of gasoline samples blended with tetrahexyltin, tetrabutyltin ,isopropyl alcohol (IPA) and methyl-tert-butyl ether (MTBE) showed that they enhanced antiknock property. The octane numbers of the blends were increased 1.2-1.8 units by adding tetrahexyltin 1-2 g/l, 1.7-2.5 units by adding tetrabutyltin 1-2 g/l, 1.4-3.9 units by adding IPA 5%-10% and 1.8-3.8 units by adding MTBE 5%-10%. In this study, unleaded gasoline base containing 3% MTBE, 2% IPA and 1.5 g/l tetrabutyltin was the best proportion which gave higher feasibility to use than the others. Bu using this proportion, the octane number was increased 4.0 units approximately.