Page 401 - Multidimensional Chromatography
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Multidimensional Chromatographic Applications in the Oil Industry  393
































                           Figure 14.14 Schematic diagram of the SFC olefins analyser system: C1, high-surface-area
                           silica column; C2, silver-loaded silica column; V1 and V2, six-port valves; FID, flame-ionisa-
                           tion detector; UV, ultraviolet monitor detector.
























                           Figure 14.15 Typical SFC chromatogram of total olefins in gasoline: 1, saturates; 2, aromat-
                           ics; 3, olefins; t(L), time of loading sample on to columns and eluting saturates; t(AR), time of
                           eluting aromatics; t(C), time of eluting remaining saturates from olefin trap; t(BF), time of
                           eluting olefins by back-flush.
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