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Title: 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 (26, alone, or 26 together with 42), the hydrogen pressure in the preheating-reaction zone being at least 1500 psig (105 kg/cm.sup.2), 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.more » 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.« less
Authors:
 [1] ;  [2] ;  [1]
  1. (Overland Park, KS)
  2. (Englewood, CO)
Publication Date:
OSTI Identifier:
864199
Report Number(s):
US 4328088
US patent application 06/182,698
DOE Contract Number:
AC01-79ET4800; AC05-78OR03055
Resource Type:
Patent
Research Org:
SRC INTERNATIONAL INC ; Pittsburg & Midway Coal Mining Co
Country of Publication:
United States
Language:
English
Subject:
controlled; residence; time; coal; liquefaction; process; normally; solid; dissolved; coal; product; distillate; liquid; product; produced; continuously; passing; feed; slurry; comprising; raw; feed; coal; recycle; solvent; oil; slurry; hydrogen; preheating-reaction; zone; 26; 26; 42; hydrogen; pressure; preheating-reaction; zone; 1500; psig; 105; kg; cm; reacting; slurry; preheating-reaction; zone; 26; 26; 42; temperature; range; 455; degree; 500; degree; dissolve; coal; form; normally; liquid; coal; normally; solid; dissolved; coal; total; slurry; residence; time; maintained; reaction; zone; ranging; finite; value; hour; reaction; effluent; continuously; directly; contacted; quenching; fluid; 40; 68; substantially; immediately; reduce; temperature; reaction; effluent; below; 425; degree; substantially; inhibit; polymerization; yield; insoluble; organic; matter; comprises; weight; percent; feed; coal; moisture-free; basis; reaction; performed; conditions; temperature; hydrogen; pressure; residence; time; quantity; distillate; liquid; boiling; range; -455; degree; amount; equal; obtainable; performing; process; conditions; total; slurry; residence; time; hour; solvent; boiling; range; liquid; separated; reaction; effluent; recycled; process; solvent; slurry residence; slurry residence; organic matter; recycle solvent; coal product; solid dissolved; solid dissolved; slurry comprising; feed slurry; residence time; residence time; residence time; residence time; liquefaction process; weight percent; coal liquefaction; reaction zone; reaction zone; reaction zone; reaction zone; liquid product; boiling range; feed coal; feed coal; process solvent; normally liquid; hydrogen pressure; hydrogen pressure; solvent boiling; normally solid; normally solid; substantially inhibit; raw feed; dissolved coal; dissolved coal; distillate liquid; distillate liquid; insoluble organic; solvent oil; comprising raw; time coal; soluble organic; continuously passing /208/