Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
40, Number 5, May/June 2002, pp. 269-275
Determination of the Boiling-Point Distribution by Simulated
Distillation from n-Pentane through n-Tetratetracontane in 70 to 80 Seconds
Joaquin A. Lubkowitz and
Roberto I. Meneghini
Separation Systems, 100 Nightingale Lane, Gulf Breeze, FL 32561
This work presents the carrying out of boiling-point distributions
by simulated distillation with direct-column heating rather than oven-column
heating. Column-heating rates of 300°C/min are obtained yielding retention
times of 73 s for n-tetratetracontane. The calibration curves of the retention
time versus the boiling point, in the range of n-pentane to n-tetratetracontane,
are identical to those obtained by slower oven-heating rates. The boiling-point
distribution of the reference gas oil is compared with that obtained with column
oven heating at rates of 15 to 40°C/min. The results show boiling-point
distribution values nearly the same (1–2°F) as those obtained with
oven column heating from the initial boiling point to 80% distilled off. Slightly
higher differences are obtained (3–4°F) for the 80% distillation to
final boiling-point interval. Nonetheless, allowed consensus differences are
never exceeded. Precision of the boiling-point distributions (expressed as standard
deviations) are 0.1–0.3% for the data obtained in the direct column-heating
mode.
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