Patents Assigned to Koppers Industries of Delaware, Inc.
  • Coal tar and hydrocarbon mixture pitch production using a high efficiency evaporative distillation process
    Patent number: 7033485
    Abstract: Described are methods that utilize high efficiency evaporative distillation to make a high softening point coal tar pitch, a quinoline insoluble-free and ash-free coal tar pitch having a desired softening point, and a mesophase coal tar pitch. Each of the methods uses a feed coal tar pitch having a softening point in the range of 70° C. to 160° C. The methods may be carried out using appropriate conventional distillation equipment, a wiped film evaporator, or a thin film evaporator.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: April 25, 2006
    Assignee: Koppers Industries of Delaware, Inc.
    Inventors: William E. Saver, E. Ronald McHenry