Patent ID: 7033485
Filing Date: 2006-04-25
Classification: B29C,C04B,C08J,C08L,C10C,C10L,F16D

Abstract:
1. A method of making a quinoline insoluble-free and ash-free coal tar pitch having a desired softening point, comprising the steps of: feeding a feed coal tar pitch having an initial softening point in the range of 70° C. to 160° C. into a processing vessel, wherein said processing vessel is heated to a temperature in the range of 300° C. to 600° C. and wherein a pressure inside said processing vessel is 5 Torr or less; obtaining a distillate from said processing vessel, said distillate having a softening point in the range of 25° C. to 60° C. and being quinoline insoluble-free and ash-free; heat treating said distillate at a temperature in the range of 350° C. to 595° C. for between five minutes and forty hours; and distilling the heat treated distillate to obtain a pitch having the desired softening point.