Controlled short residence time coal liquefaction process

Details Controlled short residence time coal liquefaction process Controlled short residence time coal liquefaction process

C - Chemistry, Metallurgy

10

G

196/5.8

C10G 1/00 (2006.01) C10G 1/06 (2006.01)

Patent

CA 1155783

ABSTRACT OF THE DISCLOSURE Normally solid dissolved coal product and a distil- late 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 therein being at least 1500 psig (105 kg/cm2), reacting the slurry therein at a temperature between about 455° and about 500°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°C and 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 C5 - 455°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. The amount of solvent boiling range liquid is sufficient to provide at least 80 weight percent of that required to maintain the process in overall solvent balance. The present process involves the remarkable discovery that a greater liquid yield can be produced at a short residence time under controlled conditions, than at a longer residence time under otherwise similar conditions, even while the primary product fraction is normally solid dissolved coal and the production of net liquid product is not encouraged.

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