Method for producing a hard pitch and particularly a...

Details Method for producing a hard pitch and particularly a... Method for producing a hard pitch and particularly a...

C - Chemistry, Metallurgy

10

C

196/39

C10C 3/08 (2006.01)

Patent

CA 1223225

Abstract of the Disclosure A hard pitch usable for a high grade of carbonaceous raw material, particularly for carbon fiber precursor pitch is prepared by heating a coal tar soft or middle pitch at a temperature of about 350-500°C to form mesophase, extracting the thus heated coal tar pitch with an aromatic solvent to remove components insoluble in the solvent which include the mesophase, removing the solvent through distillation to obtain a pitch containing no free carbon, and heating the pitch at a temperature of about 350-500°C under a reduced pressure or while blowing an inert gas, or extracting this pitch with a tar series light oil to remove low molecular weight components in the pitch.

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