High temperature (70°C) size exclusion chromatography of petroleum waxes with RI and FID detection
✍ Scribed by Carbognani, Lante
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 851 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0935-6304
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✦ Synopsis
Abstract
Molecular weight distribution of solid petroleum waxes is a key parameter for the general characterization of these materials. Particular interest concerns extremely large components, typically present in oil distillation residua, and solid deposits found in oil production facilities. Molecular weight distributions of oil waxes were determined in this work by high temperature size exclusion chromatography. Separations were carried out with two different eluents, namely toluene and ortho‐dichlorobenzene and two detection systems, these being a differential refractive index and a flame ionization detector. Toluene proved to be the best choice when combined with flame ionization detection. Better uniformity of response was the greatest advantage achieved by this approach. The experimental set up permitted analysis of samples containing molecules with up to 138 carbon atoms. Burning properties of very large molecules, isomerism affecting calibration, and signal asymmetry when flame ionization detection was adopted were three issues still requiring additional efforts to understand and to improve analysis accuracy.