Hydrocarbon-Type Analysis of Gasoline Using Stabilized Olefin Absorption and Gas Chromatography.
SOUTHWEST RESEARCH INST SAN ANTONIO TEX ARMY FUELS AND LUBRICANTS RESEARCH LAB
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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 60C, temperature-controlled oven. The precutting column and the backflush valve used to isolate the aromatic fraction from the saturate-olefin fraction were located in a separate 120C, temperature-controlled oven. Two precise sample injections using a high-pressurehigh-temperature valve are required to determine the peak areas attributed to the saturate fraction and to the olefin fraction. For volumetric analyses, the aromatic concentration was determined by comparing the aromatic peak with that of a standard. The remaining concentration of the sample was assigned to the saturate and olefin fractions based on the area attributed to each. 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. Author
- Organic Chemistry