Kovats Retention Indices of Halocarbons on a Hexafluoropropylene Epoxide-Modified Graphitized Carbon Black

Kovats retention indices of 97 halocarbons related to
research on alternative refrigerants, propellants, foaming
agents, and blowing agents have been measured on a
packed column stationary phase consisting of a 5% (mass/mass) coating of a low molecular weight polymer of
hexafluoropropylene epoxide on graphitized carbon black.
The measurements on each fluid have been made at four
temperatures, and the thermal dependence of the indices
has been modeled with appropriate equations. The modeled values are suitable for the identification of these
compounds by gas chromatography on both laboratory
and field instrumentation. The values are also useful
for
the optimization of more sophisticated analyses needed
in specific situations. The results indicate that the
stationary phase chosen will provide separation of nearly
all the fluids of interest. Moreover, we show that there
is
sufficient spread in the retention index values to
facilitate
fluid identification. The measurements also appear to
fit
a qualitative triangular property diagram that has been
useful for classifying alternative refrigerant fluids and
related compounds.