Catalytic two-stage coal hydrogenation process using extinction recycle of heavy liquid fraction
A process is described for catalytic two-stage hydrogenation and liquefaction of coal with selective extinction recycle of all heavy liquid fractions boiling above a distillation cut point of about 600--750 F to produce increased yields of low-boiling hydrocarbon liquid and gas products. In the process, the particulate coal feed is slurried with a process-derived liquid solvent normally boiling above about 650 F and fed into a first stage catalytic reaction zone operated at conditions which promote controlled rate liquefaction of the coal, while simultaneously hydrogenating the hydrocarbon recycle oils. The first stage reactor is maintained at 710--800 F temperature, 1,000--4,000 psig hydrogen partial pressure, and 10-90 lb/hr per ft[sup 3] catalyst space velocity. Partially hydrogenated material withdrawn from the first stage reaction zone is passed directly to the second stage catalytic reaction zone maintained at 760--860 F temperature for further hydrogenation and hydroconversion reactions. A 600--750 F[sup +] fraction containing 0--20 W % unreacted coal and ash solids is recycled to the coal slurrying step. If desired, the cut point lower boiling fraction can be further catalytically hydrotreated. By this process, the coal feed is successively catalytically hydrogenated and hydroconverted at selected conditions, to provide significantly increased yields of desirable low-boiling hydrocarbon liquid products and minimal production of hydrocarbon gases, and no net production of undesirable heavy oils and residuum materials. 2 figs.
- Research Organization:
- Hydrocarbon Research Inc
- DOE Contract Number:
- AC22-83PC60017
- Assignee:
- HRI, Inc., Lawrenceville, NJ (United States)
- Patent Number(s):
- US 4874506; A
- Application Number:
- PPN: US 7-109646
- OSTI ID:
- 7024746
- Resource Relation:
- Patent File Date: 16 Oct 1987
- Country of Publication:
- United States
- Language:
- English
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Catalytic two-stage coal hydrogenation and hydroconversion process
Catalytic two-stage coal hydrogenation and hydroconversion process
Related Subjects
COAL LIQUIDS
HYDROGENATION
RECYCLING
TSL PROCESS
TECHNOLOGY ASSESSMENT
FUEL SLURRIES
TEMPERATURE CONTROL
CHEMICAL REACTIONS
COAL LIQUEFACTION
CONTROL
DISPERSIONS
FLUIDS
FUELS
LIQUEFACTION
LIQUIDS
MIXTURES
SLURRIES
SUSPENSIONS
THERMOCHEMICAL PROCESSES
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