Investigation of dimethyl sulfoxide as a solvent in structural studies of coal and coal liquids

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5731456

Mallya, N

A series of coals of increasing rank were extracted with dimethylsulfoxide (DMSO) at room temperature. DMSO was found to yield high solubility for low rank coals. A detailed investigation of a Texas lignite, its DMSO soluble and insoluble fraction was carried out using various physico-chemical techniques such as Fourier transform infrared (FTIR) spectrometry, /sup 1/H nuclear magnetic resonance spectrometry (/sup 1/HNMR) and /sup 13/C cross polarization/magic angle spin NMR spectrometry (/sup 13/C CP/MAS NMR). The lignite and its DMSO soluble and insoluble fractions were further characterized by acidic functional group determination, elemental analysis and pertrifluoroacetic acid oxidation for the determination of aliphatic chain length. Concurrent studies of humic acids extracted from the same lignite were carried out for comparative purposes. The same physico-chemical and chemical techniques were used. DMSO extract of the lignite was found to be representative of the bulk lignite as well as the insoluble residue. The humic acids fraction was found to be rich in acidic functional groups and aromaticity as expected, but the sulfur content was also unusually high. This study shows that DMSO does not extract only humic acids, but, as shown by the studies undertaken, a solute which is very similar to that of the integral lignite. Ruthenium tetroxide oxidation of coals was initiated. The reagent was found to have great potential in the study of oxygen functionalities in coals. A hypothetical structure has been proposed for the Texas lignite which was the subject of this study.

• OSTI ID: 5731456
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COAL RANK
DATA
DMSO
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
EXTRACTION
FOSSIL FUELS
FUELS
HUMIC ACIDS
INFORMATION
INFRARED RADIATION
INFRARED SPECTRA
MAGNETIC RESONANCE
MATERIALS
MEDIUM TEMPERATURE
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
RADIATIONS
REFRACTORY METAL COMPOUNDS
RESONANCE
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
SEPARATION PROCESSES
SOLUBILITY
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SULFOXIDES
SULFUR CONTENT
TRANSITION ELEMENT COMPOUNDS