Patent ID: 7763167

Claim:
A direct coal liquefaction process, wherein the process comprises the following steps: (1) preparing a coal slurry from raw coal, by drying and pulverizing raw coal in a pretreating unit; processing the raw coal into a coal powder with designated particle size; preparing a superfine coal liquefaction catalyst from a catalyst feedstock and the coal powder in a catalyst preparation unit; mixing the coal liquefaction catalyst and additional coal powder with a hydrogen-donor solvent to form the coal slurry in a slurry preparation unit; (2) pretreating the coal slurry, by mixing together and preheating the coal slurry and hydrogen and after the preheating passing the mixture of coal slurry and hydrogen into a first suspended bed reactor with forced circulation to undergo liquefaction reaction to form an outlet effluent; mixing the outlet effluent from the first suspended bed reactor with make-up hydrogen and then passing the mixture of the outlet effluent and make-up hydrogen into a second suspended bed reactor with forced circulation to undergo further liquefaction reaction; (3) separating reaction effluent from the second suspended bed reactor in a separator to form a liquid phase and a gas phase, wherein the liquid phase is fractionated in an atmospheric tower into a light oil fraction and a bottom product; (4) feeding the atmospheric tower bottom product to a vacuum tower to separate it into distillate and residue; (5) mixing the light oil fraction and the distillate to form a mixture, then feeding the mixture to a suspended bed hydrotreating reactor with forced circulation for hydrogenation; (6) fractionating hydrogenation products into oil products and a hydrogen donor recycling solvent.