Changes in chemical structure during coal liquefaction in PETC's 400 lb/day liquefaction unit. [111 references]

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:5220169

Lett, R G; Schmidt, C E; Finseth, D H; Retcofsky, H L

Coal-derived materials from several experiments on the PETC 400 lb/day liquefaction unit have been investigated by spectroscopic techniques. Feed slurry and product components of a West Virginia (Ireland Mine) hvAb coal experiment were analyzed in detail to determine changes in structural parameters upon liquefaction of the coal. Mean structural units of the feed coal; coal extract; and oil, asphaltene, and pre-asphaltene fractions of the product are compared and discussed in terms of the mechanism of coal liquefaction. Free spin parameters of the feed coal and all solvent separated subfractions isolated from the liquefaction product were measured and interpreted in terms of liquefaction chemistry and the nature of the free radicals present. An analytical approach for estimating the net consumption of hydrogen during liquefaction by various mechanisms, based upon following the carbon through the reactor, is presented. To illustrate the potential application of this procedure, the relative amount of hydrogen consumed by hydrogenation, carbon-carbon bond rupture, and heteroatom elimination during liquefaction of West Virginia (Ireland Mine) hvAb coal has been calculated. Several products from the liquefaction of Western Kentucky (Homestead) hvBb coal were analyzed to investigate the removal of heteroatom components. Products from two related runs on the 400 lb/day unit, both in the presence and in the absence of an added Co-Mo/Al/sub 2/O/sub 3/ hydrodesulfurization catalyst, were studied to determine the effect of the catalyst and catalyst deactivation on the heteroatom distribution. A product sampled directly after passage through the preheater was analyzed to determine changes occurring prior to the reactor.

• Research Organization: Department of Energy, Pittsburgh, PA (USA). Pittsburgh Energy Technology Center
• OSTI ID: 5220169
• Report Number(s): DOE/PETC/TR-82/13; ON: DE82018232
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ASPHALTENES
ASPHALTS
BITUMENS
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHEMICAL BONDS
CHEMISTRY
CLEAVAGE
COAL
COAL EXTRACTS
COAL LIQUEFACTION
COAL LIQUIDS
CONSUMPTION RATES
CRYSTAL STRUCTURE
DATA
ELECTRON SPIN RESONANCE
ELEMENTS
ENERGY SOURCES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
EXTRACTION
FLUIDS
FOSSIL FUELS
FRACTIONATION
FUELS
HETEROCYCLIC COMPOUNDS
HYDROGEN
HYDROGEN 1
HYDROGEN ISOTOPES
HYDROGEN TRANSFER
INFORMATION
INFRARED SPECTRA
ISOTOPES
LIGHT NUCLEI
LIQUEFACTION
LIQUIDS
MAGNETIC RESONANCE
MASS SPECTROSCOPY
MATERIALS
MICROSTRUCTURE
MOLECULAR STRUCTURE
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
RADICALS
REMOVAL
RESONANCE
SEPARATION PROCESSES
SOLVENT EXTRACTION
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES
TAR
THERMOCHEMICAL PROCESSES