Title page for ETD etd-10132010-020048
|Type of Document
||Hollenhead, James B.
||A calorimetric study of the immersion of bituminous coal in liquids
||Master of Science
|Wightman, James P.
|Field, Paul E.
|Mason, John G.
|Date of Defense
The surface properties of coal greatly affect its use
in industrial processes such as gasification, liquefaction
and the use of coal slurries. In addition, such processes
also involve reagent penetration into coal pores and the
oxidative state of the coal surface. Reagent penetration
into coal was examined by determining the heat and kinetics
of immersion of Pocahontas No. 3 coal in water, methanol, a
series of n-alkanes, and several cyclic and heterocyclic
hydrocarbons. Results indicate that the heat of immersion
is sensitive to the carbon chain length of the wetting
liquid and its ability to hydrogen bond to coal. The time
of immersion is insensitive to carbon chain length but is
increased by the presence of nitrogen in a cyclic
The oxidation of both unextracted and extracted coal at
3200C was followed by immersional measurements in water.
The heat of immersion increased rapidly with oxidation time,
leveling off after 3 hours of oxidation. Extraction with
methanol or pyridine prior to oxidation and immersion
lowered the time of immersion in water compared to the
unextracted case. The oxidation of coal was also followed
by x-ray photoelectron spectroscopy (XPS). The XPS
oxygen/carbon ratios correlated linearly with the heats of
immersion for the extracted, oxidized coals. Thus, XPS was
shown to be a useful ancillary technique to heat of
immersion for the study of coal surfaces.
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