Thermodynamic properties for supercritical coal conversion. Quarterly progress report, December 10, 1984-March 20, 1985

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5724764

Eckert, C A

We have measured solubilities for several model coal compounds in supercritical CO/sub 2/ containing small amounts of methanol as an entrainer. Solubilities have been measured for such compounds as dibenzofuran, fluorenone, acridine and phenanthene with varying amounts of the methanol. Depending upon the nature of the functional groups within the solute molecule, the solubilities have shown moderate to large indreases over the solubility in pure CO/sub 2/. The degree of increase can be related to the amount of chemical interaction between the functional group on the entrainer and the functional groups on the solute. The use of an entrainer shows promise by also increasing the selectivity of a supercritical fluid extraction. Preliminary modelling of these doped systems has been done using the Peng Robinson (PR) equation but much more work is required in interpreting results. Correlating solubility data for the moderate temperature fluids has shown that with equal number of parameters, the cubic equation of state performs as well as the more sophisticated perturbed hard sphere equations. There are differences in regions of applicability and qualitative behavior, but numerical quality is very similar. The predictive potential appears to be greater for the hard sphere-type equations, but there remains a great deal of effort to be done before a fully predictive method for supercritical solubility is realized. 1 fig.

• Research Organization: Illinois Univ., Urbana (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-84PC70801
• OSTI ID: 5724764
• Report Number(s): DOE/PC/70801-T2; ON: DE85009298
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010407 -- Coal & Coal Products-- Solvent Extraction-- (-1987)
ACRIDINES
ALCOHOLS
AROMATICS
AZAARENES
AZINES
BENZOFURANS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COAL LIQUEFACTION
CONDENSED AROMATICS
ENERGY SOURCES
EQUATIONS
EQUATIONS OF STATE
EXTRACTION
FOSSIL FUELS
FUELS
FURANS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROXY COMPOUNDS
LIQUEFACTION
MATERIALS
METHANOL
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENANTHRENE
PYRIDINES
RESEARCH PROGRAMS
SEPARATION PROCESSES
SOLVENT PROPERTIES
SUPERCRITICAL GAS EXTRACTION
THERMOCHEMICAL PROCESSES