An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields
The overall objectives of this work are to conduct research that will provide the basis for an improved liquefaction process, and to facilitate our understanding of those processes that occur when coals are initially dissolved. Changes in coal structure that occur during coal drying and steam pretreatments will be measured in order to determine what effect water has on retrograde/condensation reactions, and to determine the mechanism by which water enhances coal reactivity toward liquefaction. Different methods for coal drying will be investigated to determine if drying can be accomplished without destroying coal reactivity toward liquefaction, thereby making coal drying a relatively economical and efficient method for coal pretreatment. Coal drying methods will include conventional thermal drying, microwave drying, and chemical drying at low temperature. State-of-the-art solid-state nuclear magnetic resonance (NMR) techniques using combined rotation and multiple pulse spectroscopy (CRAMPS) and cross polarization with magic-angle spinning (CP/MAS) will be employed: (1) to measures changes in coal structure brought about by the different methods of drying and by low temperature oxidation, and (2) to obtain direct measurements of changes in the aromatic hydrogen-to-carbon ratio of the solid/semi-solid material formed or remaining during pretreatment and the initial stages of liquefaction. The aromatic hydrogen-to-carbon ratios are difficult, if not impossible, to measure without the use of solid-state NMR, and as a result this ratio will be used to monitor the retrograde/condensation reactions that take place during coal liquefaction in the presence and absence of steam and various inert gases.
- Research Organization:
- Western Research Inst., Laramie, WY (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-91PC91043
- OSTI ID:
- 7196112
- Report Number(s):
- DOE/PC/91043-T3; ON: DE92040540
- Country of Publication:
- United States
- Language:
- English
Similar Records
An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields
An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields. Quarterly progress report, October 1, 1992--December 31, 1992
Related Subjects
COAL
DRYING
NUCLEAR MAGNETIC RESONANCE
COAL LIQUEFACTION
COAL PREPARATION
COMPARATIVE EVALUATIONS
CARBON 13
MICROWAVE RADIATION
NUMERICAL DATA
PROGRESS REPORT
CARBON ISOTOPES
CARBONACEOUS MATERIALS
DATA
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
ENERGY SOURCES
EVALUATION
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
INFORMATION
ISOTOPES
LIGHT NUCLEI
LIQUEFACTION
MAGNETIC RESONANCE
MATERIALS
NUCLEI
RADIATIONS
RESONANCE
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
010300 - Coal
Lignite
& Peat- Preparation- (1987-)