Cochin laboratory

AROMATIC & OLEFINS OR COMPOSITIONAL INFORMATION (P 23, D 1319, IP 156, ISO 3837)

Information on the total volume % of saturates, olefins, aromatics helps the refiner in controlling the blending ratio of different streams and also important to assess the quality of fuel. Gasoline-range olefinic hydrocarbons contribute to photochemical reactions in the atmosphere, which result in the formation of photochemical smog in susceptible urban areas hence quantitative determination of olefins in spark ignition engine fuels is required by government regulations at some places. Knowledge of the total olefin content also provides a means to monitor the efficiency of catalytic cracking processes. Aromatic content is a key property of low-boiling distillates such as naphtha and gasoline because the aromatic constituents influence a variety of properties including boiling range, viscosity, stability, and compatibility with a variety of solutes.