Coal liquefaction process streams characterization and evaluation
- West Virginia Univ., Morgantown, WV (United States). Dept. of Physics
This study demonstrated the feasibility of using temperature-programmed electron spin resonance (ESR) and thermogravimetric analysis (TGA) for the examination of tetrahydrofuran (THF)-soluble distillation resid materials derived from direct coal liquefaction. TGA is used to quantitate volatile losses in a temperature-programmed experiment. The TGA data are used to correct the free radical densities obtained by ESR as volatile material is evolved from the samples in the temperature-programmed ESR experiment. The techniques, when employed in tandem, can be used to determine the content and nature of the free radicals in the samples at temperatures approximating those used in the liquefaction process. TGA and ESR experiments were performed in flowing nitrogen and hydrogen, at ambient pressure. No significant difference was observed in the ESR spectra in the different atmospheres, except in the case of low-rank coal-derived resids. The TGA results, however, were systematically different; mass loss in an H[sub 2] atmosphere is consistently higher than that observed in an N[sub 2] atmosphere. It was shown that temperature-programmed ESR, which can pinpoint conditions at which the free radical content is the highest, has potential to be a guide for the appropriate choice of conditions for optimum resid upgrading. Further development of these combined analytical methods as process development tools appears justified based on these results.
- Research Organization:
- Consolidation Coal Co., Library, PA (United States). Research and Development Dept.; West Virginia Univ., Morgantown, WV (United States). Dept. of Physics
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-89PC89883
- OSTI ID:
- 6886341
- Report Number(s):
- DOE/PC/89883-57; ON: DE93004918
- Country of Publication:
- United States
- Language:
- English
Similar Records
Coal liquefaction process streams characterization and evaluation: Assessment of hydroaromatic content and hydrogen donor ability of coal liquefaction intermediates by means of catalytic dehydrogenation
Coal liquefaction process streams characterization and evaluation: FT-IR methods for characterization of coal liquefaction products
Related Subjects
COAL LIQUEFACTION
RESIDUES
STRUCTURAL CHEMICAL ANALYSIS
COAL LIQUIDS
DISTILLATION
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
FEASIBILITY STUDIES
HYDROGEN
NITROGEN
PROCESS CONTROL
RADICALS
TETRAHYDROFURAN
THERMAL GRAVIMETRIC ANALYSIS
CHEMICAL ANALYSIS
CONTROL
DATA
ELEMENTS
FLUIDS
FURANS
GRAVIMETRIC ANALYSIS
HETEROCYCLIC COMPOUNDS
INFORMATION
LIQUEFACTION
LIQUIDS
MAGNETIC RESONANCE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RESONANCE
SEPARATION PROCESSES
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
010600* - Coal
Lignite
& Peat- Properties & Composition
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction