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Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
45, Number 10, November/December 2007, pp. 636-642
Programmed Automation of Modulator Cold Jet Flow
for Comprehensive Two-Dimensional Gas Chromatographic Analysis
of Vacuum Gas Oils
Wayne Rathbun
UOP LLC, 25 E. Algonquin Rd., Des Plaines, IL 60017-5017
A method is described for automating the regulation
of cold jet flow of a comprehensive two-dimensional gas chromatograph
(GC×GC) configured with flame ionization detection. This
new capability enables the routine automated separation, identification,
and quantitation of hydrocarbon types in petroleum fractions
extending into the vacuum gas oil (VGO) range (IBP–540°C).
Chromatographic data acquisition software is programmed to precisely
change the rate of flow from the cold jet of a nitrogen cooled
loop modulator of a GC×GC instrument during sample analysis.
This provides for the proper modulation of sample compounds across
a wider boiling range. The boiling point distribution of the
GC×GC separation is shown to be consistent with high temperature
simulated distillation results indicating recovery of higher
boiling semi-volatile VGO sample components. GC×GC configured
with time-of-flight mass spectrometry is used to determine the
molecular identity of individual sample components and boundaries
of different molecular types.
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