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

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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