Thermodynamic properties for supercritical coal conversion: Quarterly progress report, 4/1/87-6/30/87

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6313879

Eckert, C A

The special properties of supercritical fluids include high density, high diffusivity, low viscosity, and high compressibility. The liquid-like density gives it a large capacity for solutes. The solubility of heavy organic solutes in SCF's is frequently many orders of magnitude greater than the solubility in an ideal gas. The ratio of these two solubilities is defined as the enhancement factor and values of 10W to 10Z are quite common. The high diffusivity and low viscosity make it an efficient medium for mass transfer. Finally, the high compressibility permits extradordinary selectivity since small pressure changes yield large density changes and, consequently, large solubility changes. We have measured the solubilities of several representative coal compounds in supercritical ammonia at 142 C and 162 C. We conducted a comparison of the ability of four equations of state to predict solubilities of the compounds in SC CO2, butane, and ammonia, and found that the PR2 and AVDW4 equations performed the best for these fluids. In addition, we conducted a search for new representative coal compounds that are better suited to higher temperature investigation. 7 figs., 3 tabs.

• Research Organization: Illinois Univ., Urbana (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-84PC70801
• OSTI ID: 6313879
• Report Number(s): DOE/PC/70801-T11; ON: DE87012293
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ALKANES
AMMONIA
ANTHRACENE
AROMATICS
BUTANE
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COMPARATIVE EVALUATIONS
COMPRESSIBILITY
CONDENSED AROMATICS
DENSITY
ENERGY SOURCES
EQUATIONS
EQUATIONS OF STATE
EXTRACTION
FOSSIL FUELS
FUELS
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SEPARATION PROCESSES
SOLUBILITY
SOLVENT EXTRACTION
SOLVENT PROPERTIES
STRUCTURAL MODELS
SUPERCRITICAL GAS EXTRACTION
SUPERCRITICAL STATE
TRIPHENYLENE
VISCOSITY