Structural characteristics of branched plus cyclic saturates from petroleum and coal derived diesel fuels
✍ Scribed by David J. Cookson; Carolyn L. Rolls; Brian E. Smith
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 562 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
✦ Synopsis
The branched plus cyclic saturates fractions from three coal-derived diesel fuels and two petroleum-diesel fuels have been characterized
and their major structural features compared. Application of a multiplet selection 13C n.m.r. technique (GASPE) yields individual 13C n.m.r. subspectra for each CH, group (n=&3) and enables the fractional abundance of CH, groups to be measured. These data are used to elucidate a number of structural features. The coal-derived samples are composed predominantly of naphthenes consisting of 2-3 rings with approximately 1 sidechain per molecule. One of the petroleum samples (PETl) contains a high proportion of branched alkanes (2 60%) with, on average, 2 branches per molecule. The naphthene component of this sample is predominantly monocyclic with approximately 3 sidechains per molecule. The second petroleum sample (PET2) has a high naphthene content (> 60%).
Its structural features, which are more difficult to characterize, are found to fall between those observed for the coal derived samples and PETl.