Controlled short residence time coal liquefaction process
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, the hydrogen pressure in the preheatingreaction zone being at least 1500 psig (105 kg/cm2), reacting the slurry in the preheating-reaction zone at a temperature in the range of between about 455 degrees and about 500 degrees 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 to substantially immediately reduce the temperature of the reaction effluent to below 425 degrees 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. Th reaction is performed under conditions of temperature, hydrogen pressure and residence time such that the quantity of distillate liquid boiling within the range C5-455 degrees 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., 3 hour. Solvent boiling range liquid is separated from T reaction effluent and recycled as process solvent.
- Assignee:
- Pittsburgh And Midway Coal Mining CO.
- Patent Number(s):
- US 4328088
- OSTI ID:
- 5179263
- Resource Relation:
- Patent File Date: Filed date 9 Sep 1980; Other Information: PAT-APPL-182698
- Country of Publication:
- United States
- Language:
- English
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Short residence time coal liquefaction process including catalytic hydrogenation
Short residence time coal liquefaction process including catalytic hydrogenation
Related Subjects
COAL
DEASHING
COAL LIQUEFACTION
CONTROL
SLURRIES
SOLID FUELS
SRC PROCESS
CARBONACEOUS MATERIALS
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
LIQUEFACTION
MATERIALS
MIXTURES
SUSPENSIONS
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction