Patents Assigned to Mitsui SRC Development Co., Ltd.
  • Patent number: 4569749
    Abstract: A process for the liquefaction of coal wherein raw feed coal is dissolved in recycle solvent with a slurry containing recycle coal minerals in the presence of added hydrogen at elevated temperature and pressure. The highest boiling distillable dissolved liquid fraction is obtained from a vacuum distillation zone and is entirely recycled to extinction. Lower boiling distillable dissolved liquid is removed in vapor phase from the dissolver zone and passed without purification and essentially without reduction in pressure to a catalytic hydrogenation zone where it is converted to an essentially colorless liquid product boiling in the transportation fuel range.
    Type: Grant
    Filed: August 20, 1984
    Date of Patent: February 11, 1986
    Assignees: Gulf Research & Development Company, Mitsui SRC Development Co., Ltd., Ruhrkohle AG
    Inventor: Charles H. Wright