Controlled short residence time coal liquefaction process

Patent · Tue May 04 04:00:00 EDT 1982

OSTI ID:864199

Anderson, Raymond P.; Schmalzer, David K.; Wright, Charles H.

Normally solid dissolved coal product and a distillate liquid product are produced by continuously passing a feed slurry comprising raw feed coal and a recycle solvent oil and/or slurry together with hydrogen to a preheating-reaction zone (26, alone, or 26 together with 42), the hydrogen pressure in the preheating-reaction zone being at least 1500 psig (105 kg/cm²), reacting the slurry in the preheating-reaction zone (26, or 26 with 42) at a temperature in the range of between about 455.degree. and about 500.degree. C. to dissolve the coal to form normally liquid coal and normally solid dissolved coal. A total slurry residence time is maintained in the reaction zone ranging from a finite value from about 0 to about 0.2 hour, and reaction effluent is continuously and directly contacted with a quenching fluid (40, 68) to substantially immediately reduce the temperature of the reaction effluent to below 425.degree. C. to substantially inhibit polymerization so that the yield of insoluble organic matter comprises less than 9 weight percent of said feed coal on a moisture-free basis. The reaction is performed under conditions of temperature, hydrogen pressure and residence time such that the quantity of distillate liquid boiling within the range C.sub.5 -455.degree. C. is an amount at least equal to that obtainable by performing the process under the same conditions except for a longer total slurry residence time, e.g., 0.3 hour. Solvent boiling range liquid is separated from the reaction effluent and recycled as process solvent.

• Research Organization: Pittsburgh & Midway Coal Mining Co., Englewood, CO (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-78OR03055
• Assignee: Pittsburg & Midway Coal Mining Co. (Englewood, CO)
• Patent Number(s): 4,328,088
• Application Number: 06/182,698
• OSTI ID: 864199
• Country of Publication: United States
• Language: English

Related Subjects

-455
/208/
105
1500
26
40
42
425
455
500
68
amount
basis
below
boiling
boiling range
cm
coal
coal liquefaction
coal product
comprises
comprising
comprising raw
conditions
contacted
continuously
continuously passing
controlled
degree
directly
dissolve
dissolved
dissolved coal
distillate
distillate liquid
effluent
equal
feed
feed coal
feed slurry
finite
fluid
form
hour
hydrogen
hydrogen pressure
immediately
inhibit
insoluble
insoluble organic
kg
liquefaction
liquefaction process
liquid
liquid product
maintained
matter
moisture-free
normally
normally liquid
normally solid
obtainable
oil
organic
organic matter
passing
percent
performed
performing
polymerization
preheating-reaction
pressure
process
process solvent
produced
product
psig
quantity
quenching
range
ranging
raw
raw feed
reacting
reaction
reaction zone
recycle
recycle solvent
recycled
reduce
residence
residence time
separated
slurry
slurry comprising
slurry residence
solid
solid dissolved
soluble organic
solvent
solvent boiling
solvent oil
substantially
substantially inhibit
temperature
time
time coal
total
value
weight
weight percent
yield
zone