Coal liquefaction process
A coal conversion process which produces an increased yield of distillable products through an efficient use of hydrogen. Coal is contacted with a liquefaction solvent comprised of a process derived light phase residuum and a process derived distillate under liquefaction conditions to form a coal conversion product effluent. The effluent is admixed with a process derived hydrogenation residuum to supply hydrogen-donors and to cool and stabilize the effluent against regressive reactions. Distillables boiling below about 1000* F. Then are separated from the combined stream. A portion of the distillables can be recycled for use as solvent or hydrogenated and then recycled. The remaining residuum is admixed with a deashing solvent and thereafter deashed and fractionated under elevated temperature and pressure conditions. The residuum is separated to form a light phase residuum which is recycled for use as solvent and a heavy phase residuum suitable for further up grading. The heavy phase residuum is admixed with a process derived hydrogenation distillate and introduced into a hydrogenation zone. At least a portion of the heavy phase residuum is hydrogenated to form a hydrogenation distillate having a boiling temperature below about 1000* F. The hydrogenation distillate is recovered as a product and a portion is recycled to provide the process derived hydrogenation distillate that is admixed with heavy phase residuum. The remainder of the hydrogenated heavy phase residuum is recycled as the process derived hydrogenation residuum that is admixed with the liquefaction effluent.
- Assignee:
- Electric Power Research Institute
- Patent Number(s):
- US 4372838
- OSTI ID:
- 6421497
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL LIQUEFACTION
DEASHING
DISTILLATES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN TRANSFER
HYDROGENATION
LIQUEFACTION
MATERIALS
RECYCLING
SOLVENTS
THERMOCHEMICAL PROCESSES