Solvent tailoring in coal liquefaction. Final report, August 1, 1980-October 31, 1984
The key to better and more effective coal liquefaction may be in proper tailoring of the coal liquefaction recycle solvent. The objective of this work is to investigate various factors which contribute to the solvent effectiveness as a coal liquefaction agent. Particular emphasis is placed on the critical solvent properties and on critical properties of solvent mixtures. Physical solvating effects as well as chemical interactions, e.g., H-donation are also considered. This part of the program is an attempt to delineate and better understand the significance of the thermodynamic properties of solvent components - diluents, physical solvating agents, and hydrogen donors and shuttlers - on reactivity and selectivity at various stages of liquefaction, including second-stage liquefaction. Solvent properties are very important factors contributing to the success or failure of a coal liquefaction process. The liquefaction process solvent serves a three-fold purpose: it acts as a solvent for soluble fractions and products; it influences the liquefaction reactions, e.g., as a donor of hydrogen to free radicals formed by thermal rupture of chemical bonds; and it acts as a carrier fluid for feed coal and for reaction products. In solvent tailoring all three functions must be considered and a proper balance must be sought. This depends on the thermodynamic properties of the solvent constituents contributing to each of these three functions. The thermodynamic properties of each constituent, to some degree, have an interacting effect on those of the others. One purpose of this work is to develop an understanding of how to utilize this interaction to accelerate liquefaction kinetics and improve product selectivity.
- Research Organization:
- Auburn Univ., AL (USA). Coal Conversion Lab.
- DOE Contract Number:
- FG22-80PC30209
- OSTI ID:
- 5989547
- Report Number(s):
- DOE/PC/30209-T12; ON: DE85005621
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
DEACTIVATION
REGENERATION
COAL LIQUEFACTION
ORGANIC SOLVENTS
COAL LIQUIDS
CHROMATOGRAPHY
HYDROCRACKING
HYDROGEN TRANSFER
HYDROGENATION
RECYCLING
SOLVENT EXTRACTION
DEHYDROGENATION
CALIBRATION
COKE
COMPUTERIZED SIMULATION
DEPOSITS
EQUILIBRIUM
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
LIQUIDS
OXIDATION
SOLVENT PROPERTIES
SPECIFICITY
STRUCTURAL MODELS
TEMPERATURE EFFECTS
TETRALIN
THERMODYNAMIC PROPERTIES
VAPORS
AROMATICS
CHEMICAL REACTIONS
CRACKING
DATA
DECOMPOSITION
EXTRACTION
FLUIDS
GASES
HYDROCARBONS
INFORMATION
LIQUEFACTION
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
SEPARATION PROCESSES
SIMULATION
SOLVENTS
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction