Controlled short residence time coal liquefaction process

Patent · Tue May 04 04:00:00 EDT 1982

OSTI ID:5179263

Anderson, R P; Schmalzer, D K; Wright, C 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, 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
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
CARBONACEOUS MATERIALS
COAL
COAL LIQUEFACTION
CONTROL
DEASHING
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
LIQUEFACTION
MATERIALS
MIXTURES
SLURRIES
SOLID FUELS
SRC PROCESS
SUSPENSIONS
THERMOCHEMICAL PROCESSES