Characterization of coal molecular structure using high resolution chromatographic techniques

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:7042724

Chang, H C

Capillary gas chromatography was applied to study the structural features of coals of different rank. Coal samples were first extracted with pyridine, and the coal extracts were fractionated based on chemical class and the number of aromatic rings. A number of compounds were identified for the first time. Structural differences as a function of coal rank were observed for the low-molecular-weight aliphatic, neutral polycyclic aromatic, sulfur-containing polycyclic aromatic, and nitrogen-containing polycyclic aromatic compounds. The nonextractable residues of different rank coals were subjected to solvated electron reduction. A total of 61 wt% solubility was obtained for a low rank North Dakota lignite. Cleavage of weak linkages and distortion of hydrogen bonds were the main reactions involved in this reduction, which resulted in high solubility for the low rank coal. Chemically bonded long chain n-alkanes were identified in the North Dakota lignite from its reduced products.

• Research Organization: Brigham Young Univ., Provo, UT (USA)
• OSTI ID: 7042724
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
MOLECULAR STRUCTURE
CAPILLARY FLOW
CHEMICAL BONDS
CHEMICAL REACTIONS
CLEAVAGE
COAL EXTRACTS
COAL RANK
GAS CHROMATOGRAPHY
LIGNITE
MOLECULAR WEIGHT
PYRIDINE
RESIDUES
SAMPLE PREPARATION
SOLUBILITY
SOLVENT EXTRACTION
STRUCTURAL CHEMICAL ANALYSIS
AZINES
BROWN COAL
CARBONACEOUS MATERIALS
CHROMATOGRAPHY
CRYSTAL STRUCTURE
ENERGY SOURCES
EXTRACTION
FLUID FLOW
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
MATERIALS
MICROSTRUCTURE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
SEPARATION PROCESSES
010600* - Coal
Lignite
& Peat- Properties & Composition