Estimation of aliphatic H/C ratios for coal liquefaction products by spin-echo 13C n.m.r.
β Scribed by Colin E. Snape
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 360 KB
- Volume
- 62
- Category
- Article
- ISSN
- 0016-2361
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π 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.
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
Factors affecting the spin-lattice relaxation times T, of 13C resonances at 62.9 MHz were investigated for simplemixtures of tetralin, ethylbenzene, pentane and phenol and the prominent resonances of an anthracene oil and a coal-derived hydrogenation oil. Parameters varied were solvent temperature a