PURPOSE: To obtain a pitch suitable as binder pitch for producing an artificial graphite electrode, impregnated pitch, etc., by adding an aqueous solution of a nonoxidizing acid to a solution of QI-free pitch, separating and recovering formed precipitate, neutralizing and heat-treating to adjust a softening point.
CONSTITUTION: Preferably 0.01W1N aqueous solution of a nonoxidizing acid such as hydrochloric acid, diluted sulfuric acid, acetic acid, etc., is added to a solution of QI-free pitch and formed precipitate is separated and recovered. The precipitate is washed with a basic aqueous solution of sodium hydroxide, ammonia, etc., to give pitch. Then, the pitch is directly heat-treated or blended with QI-free pitch or soft pitch and heat-treated and adjusted to a desired softening point, to give the aimed pitch.
| WO/2011/090693 | METHODS FOR OBTAIINING BITUMEN FROM BITUMINOUS MATERIALS |
| WO/1996/014369 | PROCESS FOR ISOLATING MESOPHASE PITCH |
SATO MAKI
MATSUI YOSHIAKI
NIPPON STEEL CHEMICAL CO
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