Ga. Sturrock et al., ANALYSIS OF CHLOROFLUOROCARBON REPLACEMENT COMPOUNDS BY CAPILLARY GAS-CHROMATOGRAPHY, Journal of chromatography, 648(2), 1993, pp. 423-431
Several thick film wall-coated open tubular and porous-layer open tubu
lar (PLOT) type capillary columns have been investigated for the separ
ation of wide boiling range (-57.8 to 61.2-degrees-C) of hydrofluoroca
rbons (HFCs) and halocarbons. The aim is to select the best column in
terms of resolution, analysis time and conditions suitable for use in
conjunction with an automated air analysis method for these compounds
which are intended as replacements for the ozone-depleting chlorofluor
ocarbons. The problems associated with each column are reported with e
mphasis on the catalytic activity of two types of alumina PLOT columns
towards certain HFCs and halocarbons. Due to their inherent basicity,
the alumina PLOT columns induce dehydrochlorination reactions in spit
e of the additional deactivation of the alumina with KCl and Na2SO4.