Estimation of quaternary and tertiary aromatic carbon in coal liquefaction products by spin-echo 13C n.m.r.
โ Scribed by Colin E. Snape
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 374 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0016-2361
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๐ SIMILAR VOLUMES
Aliphatic carbon peaks in the complex 13C n m.r. spectra of coal-derived liquids can be unambiguously assigned to C, Cl-l, CH2 and CH3 groups using a spin-echo technique.
13G1 H heteronuclear dipolar dephasing n.m.r. techniques allow discrimination between different chemical species contributing to the 13C n.m.r. spectra of complex hydrocarbons. Model compound studies show significantly different effective transverse relaxation constants for carboxyl and quaternary c
Three H-Coal liquids, ASO, ASB, and VSO, have been characterized by quantitative FT-n.m.r. spectroscopy. FT-parameters were chosen to allow determination of aromatic:aliphatic carbon ratios to within 1% and 2% error of the theoretical and the absolute number of aromatic and aliphatic carbons in a si