BigPatents India

Unleaded blend compositions, as well as formulated gasolines containing them have a Motor Octane Number (MON) of at least 80 comprising at least 2 % of component (a), which is at least one branched chain alkane of MON value of at least 90 and of boiling point 15-160 °C or a substantially aliphatic hydrocarbon refinery stream, of MON value of at least 85, at least 70 % in total of said stream being branched chain alkanes, said stream being obtainable or obtained by distillation from a refinery material as a cut having Initial Boiling Point of at least 15 °C and Final Boiling Point of at most 160 °C, said Boiling Points being measured according to ASTMD2892, and as component (g) at least 5 % of at least one paraffin, liquid hydrocarbon or mixture thereof e.g. aromatic hydrocarbon compound or olefinic hydrocarbon of bp60-160 °C, especially of MON value at least 70 and RON at least 90 or as component (g) at least 20 % of one or more refinery streams. The component (a) gives rise to reduced emissions to the composition or gasoline on combustion.