Weathering effects on the structure and reactivity of US coals: Final report, July 15, 1984-July 14, 1987. [Many data]
This report covers the work performed from July 1984 to July 1987 under the project entitled ''Weathering Effects on Structure and Reactivity of US Coals'' (grant number FG22-84PC70798). The main objectives of the study were to investigate the structural changes in coal during the weathering process as well as to develop a simple, reliable weathering index, which can monitor indirectly the weathering-induced changes in physical and chemical properties. Although there have been numerous publications on structure and reactivity of coal, most data reported in the literature thus far have been obtained on coal samples of uncertain weathering status and therefore need to be interpreted with great caution. Weathering has a profound effect on many important coal properties such as heating value, caking characteristics, acidity, flotability and reactivity in liquefaction, combustion and gasification processes. The objective of developing a weathering index is to predict these coal property changes due to weathering without resorting to real-time measurements or pilot plant runs. This report is comprised of four main chapters: I. Structural Changes due to Weathering; II. Material Balance in Weathering Process; III. Development of a Reliable Weathering Index; and IV. Proposed Weathering Mechanisms. A battery of sophisticated analytical tools and techniques was employed during this study. Pyrolysis mass spectrometry in time-integrated, as well as in time-resolved modes with computer-aided data analysis techniques (such as factor and discriminant analysis), gas chromatography, thermogravimetry/mass spectrometry and solvent extraction were used for determining the role of oxygen during the weathering process. Pyrolysis mass spectrometry, Free Swelling Index and a novel slurry pH technique were employed as weathering indicators. 170 refs.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Biomaterials Profiling Center
- DOE Contract Number:
- FG22-84PC70798
- OSTI ID:
- 5544442
- Report Number(s):
- DOE/PC/70798-T11; ON: DE88002107
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
PHYSICAL PROPERTIES
PYROLYSIS
THERMAL GRAVIMETRIC ANALYSIS
WEATHERING
MASS SPECTROSCOPY
OXYGEN
PYROLYSIS PRODUCTS
ADSORPTION
AROMATICS
BITUMINOUS COAL
CALORIFIC VALUE
CHEMICAL REACTION KINETICS
CROSS-LINKING
CURIE POINT
FOURIER TRANSFORMATION
INFRARED SPECTRA
MACERALS
MOLECULAR STRUCTURE
OXIDATION
OXYGEN 18
PROGRESS REPORT
SOLVENT EXTRACTION
SUBBITUMINOUS COAL
SWELLING
TRACER TECHNIQUES
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
COMBUSTION PROPERTIES
DECOMPOSITION
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
EVEN-EVEN NUCLEI
EXTRACTION
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
INTEGRAL TRANSFORMATIONS
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LIGHT NUCLEI
MATERIALS
NONMETALS
NUCLEI
ORGANIC COMPOUNDS
OXYGEN ISOTOPES
POLYMERIZATION
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSFORMATIONS
TRANSITION TEMPERATURE
010600* - Coal
Lignite
& Peat- Properties & Composition