SummaryAn automatic sampling device has been developed for capillary zone electrophoresis. The sample is introduced to the column electrokinetically by rapidly exchanging buffer for sample in a narrow channel drilled in a plexiglass block. The autosampler is capable, under computer control, of performing multiple sample injections from a large volume sample source (such as a reaction vessel) as the sample concentration changes, and thus presents the possibility of analyzing time-varying processes by CZE. Peak area reproducibility in electropherograms obtained after use of the sampler is less than 1 % and efficiency is more than 2.2 x lo5 theoretical plates.
Thermal cracking of n-hexadecane was investigated in a
temperature range of 450−600 °C in
the presence of CO2. Effects of pressure and
temperature on product distribution were
experimentally determined under both subcritical and supercritical
conditions. At 1.2 MPa and
with a CO2 to n-C16 mole ratio of
25, C6−C14 olefins,
C10−C17 paraffins, and
C5−C10 fatty acids
were identified in the liquid product. Experiments conducted at
4.5 MPa (supercritical) yielded
higher selectivities for fatty acids and paraffins. The product
distribution of fatty acids and
olefins was found to be very sensitive to pressure and temperature.
It was also concluded that
heterogeneous carbon formation on the reactor surface was inhibited by
the supercritical phase.
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