Catalytic two-stage coal hydrogenation process using extinction recycle of heavy liquid fraction
- Denville, NJ
- Yardley, PA
- Somerville, NJ
A process 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.degree.-750.degree. 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.degree. 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.degree.-800.degree. F. temperature, 1000-4000 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 Partially hydrogenated material withdrawn from the first stage reaction zone is passed directly to the second stage catalytic reaction zone maintained at 760.degree.-860.degree. F. temperature for further hydrogenation and hydroconversion reactions. A 600.degree.-750.degree. 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.
- Research Organization:
- Hydrocarbon Research Inc
- DOE Contract Number:
- AC22-83PC60017
- Assignee:
- HRI, Inc. (Lawrenceville, NJ)
- Patent Number(s):
- US 4874506
- OSTI ID:
- 867134
- Country of Publication:
- United States
- Language:
- English
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-800
-860
/208/
0-20
10-90
1000-4000
600
650
710
760
ash
boiling
carbon gases
catalyst
catalytic
catalytic reaction
catalytic two-stage
catalytically
catalytically hydrotreated
coal
coal feed
coal hydrogen
coal hydrogenation
coal slurry
conditions
containing
controlled
controlled rate
conversion reaction
conversion reactions
cut
degree
desirable
desired
directly
distillation
extinction
extinction recycle
fed
feed
fraction
fraction containing
fractions
gas
gas product
gas products
gases
heavy
heavy liquid
heavy oil
heavy oils
hydrocarbon
hydrocarbon gas
hydrocarbon gases
hydrocarbon liquid
hydroconversion
hydroconverted
hydrogen
hydrogen partial
hydrogenated
hydrogenated material
hydrogenating
hydrogenation
hydrogenation process
hydrotreated
increased
increased yield
increased yields
lb
liquefaction
liquid
liquid fraction
liquid fractions
liquid product
liquid products
liquid solvent
low-boiling
low-boiling hydrocarbon
maintained
material
materials
minimal
net
normally
normally boiling
oils
operated
partial
partial pressure
partially
partially hydrogenated
particulate
particulate coal
passed
passed directly
pressure
process
process-derived
produce
produce increased
production
products
promote
provide
provide significantly
psig
psig hydrogen
rate
reaction
reaction zone
reactions
reactor
recycle
recycled
residuum
selected
selective
significantly
significantly increase
significantly increased
simultaneously
slurried
slurrying
solids
solvent
solvent normally
space
space velocity
stage
stage catalytic
stage coal
stage hydrogenation
stage reaction
stage reactor
step
successively
temperature
two-stage
two-stage coal
undesirable
unreacted
unreacted coal
velocity
withdrawn
yields
zone
zone maintained