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- W1567366233 abstract "In order to better understand the reactions of heteroatom-containing organics which occur during liquefaction of subbituminous coal, it is necessary to distinguish between coal-derived and solvent-derived species. A coal-derived liquefaction solvent, A04, was deuterium-labeled by a method developed at the University of North Dakota Energy and Minerals Research Center and found to be stable under liquefaction conditions. The deuterium-labeled A04 was reacted in the presence of unconverted coal (tetrahydrofuran-insoluble material from a previous autoclave liquefaction test), water, carbon monoxide, and hydrogen sulfide at 350 C and 1,000 psia for 30 minutes. No significant degradation in isotopic purity was observed in the mass spectra of the individual deuterated species comprising approximately 95 wt% of the deuterated solvent. Tests were also conducted with raw coal under similar liquefaction conditions to determine the amounts of coal-derived compounds evolved, and whether these compounds will undergo deuterium exchange with the deuterated solvent. Distillable products are being analyzed using GC/MS, and soluble and insoluble products are being analyzed using liquid proton and solid state C-13 NMR. The deuterium-labeling method has also been used to synthesize 16 model compounds including O-, S-, and N-containing aromatics to be used in future liquefaction tests. Analytical results including product componentmore » identification, coal conversion as determined by tetrahydrofuran solubility, and changes observed in NMR spectra are presented.« less" @default.
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- W1567366233 date "1988-01-01" @default.
- W1567366233 modified "2023-09-23" @default.
- W1567366233 title "Coal liquefaction using deuterium-labeled anthracene oil solvent" @default.
- W1567366233 hasPublicationYear "1988" @default.
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