HYDROCARBON-TYPE ANALYSIS OF GASOLINE USING STABILIZED OLEFIN ABSORPTION AND GAS-CHROMATOGRAPHY

A gas chromatographic technique has been evaluated for the precise determination of the saturate, olefin, and aromatic composition of motor gasoline. This procedure extends the capability of a test technique used to isolate the aromatic and saturate-olefin fractions of gasoline through the addition of a dual-column valve, olefin-absorber column, and humidified carrier gas for olefin-absorber stabilization in a 60 C, temperature-controlled oven. The precision of this technique has been evaluated for 12 gasolines having olefin and aromatic concentrations ranging from 2 and 9 to 46 and 50 percent volume, respectively. Data from and advantages of this technique are compared to that of other hydrocarbon techniques.