Analysis of Siloxanes in Hydrocarbon Mixtures Using Comprehensive Two-Dimensional Gas Chromatography
Journal of Chromatography A
A comprehensive two-dimensional gas chromatography (GC × GC) method for separating siloxanes from hydrocarbons has been developed using a systematic process. First, the retention indices of a set of siloxanes and a set of hydrocarbons were determined on 6 different stationary phases. The retention indices were then used to model GC × GC separation on 15 different stationary phase pairs. The SPB-Octyl × DB-1 pair was predicted to provide the best separation of the siloxanes from the hydrocarbons. The efficacy of this stationary phase pair was experimentally tested by performing a GC × GC analysis of gasoline spiked with siloxanes and by analyzing biogas obtained from a local wastewater treatment facility. The model predictions agreed well with the experimental results. The SPB-Octyl × DB-1 stationary phase pair constrained the hydrocarbons to a narrow range of secondary retention times and fully isolated the siloxanes from the hydrocarbon band. The resulting GC × GC method allows siloxanes to be resolved from complex mixtures of hydrocarbons without requiring the use of a selective detector.
ISSN: 0021-9673, ESSN: 1873-3778
© 2014 Elsevier B.V. All rights reserved
Nartker, Steven; Seeley, Stacy; Ghosh, Abhijit; and Seeley, John, "Analysis of Siloxanes in Hydrocarbon Mixtures Using Comprehensive Two-Dimensional Gas Chromatography" (2014). Chemical Engineering Publications. 17.