Open tubular supercritical fluid chromatography (ot-SFC) applied to the separation of coal-derived products obtained by supercritical fluid extraction (SFE)
Mch. Tavares et Fm. Lancas, Open tubular supercritical fluid chromatography (ot-SFC) applied to the separation of coal-derived products obtained by supercritical fluid extraction (SFE), HRC-J HIGH, 23(7-8), 2000, pp. 515-518
This work describes the construction and evaluation of a simple and versati
le capillary supercritical fluid chromatographic (SFC) system and its appli
cation to the analysis of liquid fuels obtained by SFE. The modular supercr
itical fluid chromatography (SFC) system uses a syringe pump, a fused silic
a capillary column (100 mu m i.d., coated with a 0.2-mu m thick film of 5%
phenylpolymethylsiloxane), a FID detector, and a high pressure injection va
lve with a 60-nL internal loop. Coal-derived samples were obtained by super
critical fluid extraction (SFE) of a Brazilian high-inertinite coal from Am
ando Simoes mine, located in Parana state (Brazil) using toluene as solvent
and operating in the static mode. SFE was Followed by preparative liquid c
hromatography fractionation into eight discrete fractions (PLC-8 method). T
wo of those fractions (F-2 and F-8) were used to evaluate the proposed set-
up. The system described proved to be simple, easy-to-use, and versatile wh
en used in the analysis of a range of samples from low molecular weight-low
volatility (F-2) to higher molecular weight-high polarity asphaltols (F-8)
.