A PROCESS FOR DIRECT LIQUEFACTION OF COAL

摘要

The present invention relates to a process for direct coal liquefaction of coal. The process comprises: (1) preparing a coal slurry from raw coal; (2) preheating the coal slurry, then feeding it into a reaction system to undergo liquefaction reaction; (3) separating reaction products in a separator (9, 10) to form a liquid phase and a gas phase, wherein the liquid phase is fractionated in an atmospheric tower (11) into a light oil fraction and a bottom product; (4) feeding the atmospheric tower bottom product to a vacuum tower (12) to separate into distillate and vacuum residue; (5) mixing the light oil fraction and the distillate to form a mixture, then feeding the mixture to a suspended bed hydrotreating reactor (13) with forced circulation for hydrogenation; (6) fractionating hydrogenation products into oil products and a hydrogen donor recycling solvent. The process could be operated steadily over a long period of time, with higher reactor efficiency and utilization factor. It could prevent mineral salts sedimentation and be operated under mild reaction conditions, therefore, the liquid oil yield could be increased and high-quality feedstock for further processing could be supplied.