Chemical characterization of thermal maturity in coals using high-resolution chromatographic methods. Annual report, May 1989-April 1990

Technical Report · Sun Jul 01 04:00:00 EDT 1990

OSTI ID:6501612

Lee, M L

A mild base-catalyzed depolymerization method has been applied to three coals (North Dakota Lignite, Utah Blind Canyon high volatile bituminous, and Pocahontas No. 3 low volatile bituminous) from low to high rank. Resultant solubilities ranged from 60 to 90 percent. Comparative results of the depolymerization products with coal solvent extracts indicate that the solvent extractable portion of coal becomes more characteristic of the macromolecular structure of coal as rank increases. Furthermore, the compositions of the depolymerized macromolecular structures of the different rank coals were surprisingly similar. The polycyclic aromatic hydrocarbons in the solvent extracts had structural features that appear to be more related to coal rank or maturity than do the components of the depolymerized coals. There were preferred aromatic moieties for which the degree of alkylation and extent of aromatization decreased and increased, respectively, with rank. The use of supercritical ammonia as a mobile phase, and the improvements in two-dimensional chromatograph for supercritical fluid chromatography strengthen the possibility of identifying aromatic moieties with linking groups in the various fractions.

• Research Organization: Brigham Young Univ., Provo, UT (USA). Dept. of Chemistry
• OSTI ID: 6501612
• Report Number(s): PB-90-270372/XAB; CNN: GRI-5088-260-1640
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
AROMATICS
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
COAL EXTRACTS
COAL RANK
COMPARATIVE EVALUATIONS
DECOMPOSITION
DEPOLYMERIZATION
DISSOLUTION
DOCUMENT TYPES
ENERGY SOURCES
FEDERAL REGION III
FEDERAL REGION VIII
FOSSIL FUELS
FUELS
HYDROCARBONS
LIGNITE
MATERIALS
MATURATION
MOLECULAR STRUCTURE
NORTH AMERICA
NORTH DAKOTA
ORGANIC COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
PROGRESS REPORT
SEPARATION PROCESSES
STRUCTURAL CHEMICAL ANALYSIS
SUPERCRITICAL FLUID CHROMATOGRAPHY
USA
UTAH
VIRGINIA