Coal liquefaction process employing internal heat transfer

Details Coal liquefaction process employing internal heat transfer Coal liquefaction process employing internal heat transfer

C - Chemistry, Metallurgy

10

G

196/5.8

C10G 1/06 (2006.01)

Patent

CA 1132926

COAL LIQUEFACTION PROCESS EMPLOYING INTERNAL HEAT TRANSFER ABSTRACT OF THE DISCLOSURE A coal liquefaction process wherein a feed coal-solvent slurry is preheated in a thoroughly back- mixed preheater zone (46) and then passed to a dissolver zone (58). Hot hydrogen (70) is introduced to the process downstream from the preheater zone at or in advance of the dissolver zone and exothermic hydro- cracking reactions occur in the dissolver zone (58). A dissolver zone effluent stream (76) is passed through a vapor-liquid separator (78) and separated hot dis- solver vapor (80) at process pressure is vented through the preheater zone (46) wherein it is quenched to provide direct transfer to the preheater zone of the exothermic heat generated in the dissolver zone. The preheater zone is continuously vented (86) to provide rapid removal of cooled vapor from the preheater zone and from the process, advantageously leaving an accumu- lation of liquid in the preheater zone boiling between the temperatures of the vapor-liquid separator and the preheater zone at process pressure. Venting of hot vapor generated in the exothermic dissolver zone through the preheater zone to accomplish direct internal heat exchange within the process requires continuous venting of cooled vapor from the preheater zone independently of removal of slurry from the preheater zone. Such independent venting of the preheating zone is feasible because of the introduction of hydrogen to the process downstream from the preheating zone.

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