Routine method for quantitative 13C n.m.r. spectra editing and providing structural patterns: Application to every kind of petroleum fractions including residues and asphaltenes
✍ Scribed by Michel Bouquet; Alain Bailleul
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 725 KB
- Volume
- 65
- Category
- Article
- ISSN
- 0016-2361
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✦ Synopsis
In order to derive structural hydrocarbon patterns of petroleum cuts, including high molecular fractions and heavy cuts, in both quantitative and routine procedure, the authors have built up a method based on inverse gated decoupling and gated spin-echo r3C experiments. Multiplet selection methods allow identification of CH, groups (n = 0-3) and quantitativeness is obtained with the use of relaxation reagent, two conventional spin echo and three gated spin echo experiments, and a correction factor applied to aliphatic carbons basic spectra. Different steps of the method are discussed theoretically and examples dealing with vacuum distillates, residues and fractions (resins, asphaltenes) are given. Emphasis has been put on the experimental and practical running of the described method, convenient with routine industrial research experiments.