Quantitative Determination of Saturates, Olefins, and Aromatics in Hydrocarbon Distillate Products Using High-Performance Liquid Chromatography with Dielectric Constant Detection (HPLC-DC).
Final technical rept. Jun 85-Mar 86,
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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A dielectric constant DC detector for high-performance liquid chromatography HPLC is the basis of a rapid and accurate hydrocarbon group-type analysis. This novel method can determine saturates, olefins, and total aromatics in hydrocarbon liquids with distillation endpoints of at least 400 deg C. The HPLC separation is achieved using a single, 5-micron olefin-selective column, a backflush valve, and Freon 123 as the mobile phase. The DC detector ensures a genuine uniformity of response less than 2.5 RSD for each hydrocarbon group type, independent of the carbon number distribution of the sample. Unity response factors are sufficient. On the basis of complex solutions of hydrocarbon standards, the accuracy for each structural group type is within one percent absolute. The chromatographic limit of detection is less than 0.5 volume percent 800 ng for the last eluting hydrocarbon group, i.e., the backflushed olefins.
- Organic Chemistry