Determination of carbon C, CH, CH2 and CH3 group abundances in liquids derived from petroleum and coal using selected multiplet 13C n.m.r. spectroscopy

✍ Scribed by David J. Cookson; Brian E. Smith

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 517 KB
• Volume: 62
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(83)90248-x

✦ Synopsis

Selected, multiplet 13C n.m.r. spectra are obtained for three test samples deriving from petroleum and coal sources, by combining gated spin echo (GASPE) and conventional spin echo 3C n.m.r. procedures. Each selected multiplet spectrum contains resonances due to only one of the following groups: aromatic C or CH or aliphatic C, CH, CH, or CH,. In general artifacts contribute only minor intensity to individual spectra, with the separation between aliphatic CH and CH, spectra being the most difficult to achieve. Each spectrum can be integrated to yield the relative abundances of CH, groups (n=O to 3). Selected multiplet 13C n.m.r. spectra provide a more detailed view of the component hydrocarbon groups in fossilfuel derived materials than can be deduced from conventional 13C n.m.r. spectra.