Coal liquefaction with preasphaltene recycle

Patent · Tue Sep 02 04:00:00 EDT 1986

OSTI ID:5252909

Weimer, R F; Miller, R N

A process is described for solvent refining coal to yield an asphaltene-rich product stream by forming a slurry of finely divided coal and a process solvent therefor, which process comprises the steps of: (1) contacting the slurry with a hydrogen-rich gas; (2) heating the slurry in the presence of the hydrogen-rich gas. (3) permitting the heated slurry to react and to dissolve at least some of the coal. (4) adding fresh hydrogen as required to form a liquefied coal slurry; (5) passing the liquefied coal slurry to a separator in which a vapor product stream and a condensed product stream are separated; (6) passing the condensed product stream to a vacuum distillation still; (7) removing from the vacuum distillation still a residual bottoms product, wherein the residual bottoms product from the still is mixed with a suitable extractions solvent and is passed to supercritical extraction system to separate an asphaltene-rich stream comprised of pentane solubles and benzene solubles from a preasphaltene-rich stream which includes solids residue material, the preasphaltene-rich stream comprised of benzene insolubles, pyridine solubles, pyridine insolubles and ash; (8) recycling at least a portion of the preasphaltene-rich stream together with the solid residue material as process solvent, with less than 10 percent of the process solvent comprising asphaltenes; (9) withdrawing the asphaltene-rich stream and passing the asphaltene-rich stream to a solvent recovery system to yield an asphaltene-rich product stream and an extraction solvent stream.

• Assignee: International Coal Refining, Allentown, PA
• Patent Number(s): US 4609455
• OSTI ID: 5252909
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ALKANES
AROMATICS
ASHES
ASPHALTENES
ASPHALTS
AZINES
BENZENE
BITUMENS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL FINES
COAL LIQUEFACTION
DISPERSIONS
DISSOLUTION
DISTILLATION
ELEMENTS
EXTRACTION
FLUIDS
FUEL SLURRIES
FUELS
GASES
HEATING
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN
HYDROGENATION
KINETICS
LIQUEFACTION
MIXING
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SOLVENTS
OTHER ORGANIC COMPOUNDS
PENTANE
PYRIDINES
REACTION KINETICS
RECYCLING
RESIDUES
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SLURRIES
SOLVENT EXTRACTION
SOLVENTS
SUSPENSIONS
TAR
THERMOCHEMICAL PROCESSES
VACUUM DISTILLATION
VAPOR CONDENSATION
VAPORS
YIELDS