Patents Assigned to Exxon Research and Enginnering Company
  • Coal depolymerization and hydroprocessing
    Patent number: 5294349
    Abstract: A process for hydroprocessing coal to hydrocarbon oils wherein coal is depolymerized at low temperatures by contacting finely divided coal with a hard acid and soft base. The depolymerized coal is then hydroprocessed to hydrocarbon oils by forming a mixture with a coal conversion catalyst or precursor thereof, and hydroprocessing the mixture at temperatures of from 250.degree. to 550.degree. C. and hydrogen partial pressures of from 2100 to 35000 kPa.
    Type: Grant
    Filed: August 4, 1992
    Date of Patent: March 15, 1994
    Assignee: Exxon Research and Enginnering Company
    Inventors: George M. Kramer, Edwin R. Ernst, Chang S. Hsu, Gopal H. Singhal, Peter S. Maa