| 摘要 |
PURPOSE:To prepare pitch having a high degree of carbonization and free from mesophase, by hydrorefining coal tar pitch in the presence of a hydrogenating catalyst under particular conditions and conducting thermal reforming of the hydrogenation product. CONSTITUTION:Coal tar pitch (preferably soft pitch having a softening point of 70 deg.C or below from the standpoint of handleability) is hydrorefined in the presence of a hydrogenating catalyst (e.g., an Ni-Mo/alumina-base catalyst) to attain a degree of hydrogenation of at least 5g-H/kg-pitch in terms of the hydrogen absorption and a degree of denitrification of 80wt.% or less. The thermal reforming of the hydrorefined coal tar pitch is conducted at 350-450 deg.C for 0.5-10hr in a closed system. Thus, there is prepd. pitch having a high degree of carbonization and free from mesophase. The pitch thus prepd. exhibits high performance when used as binder pitch and impregnated pitch and is expected to improve the yield and properties of the product when used as a raw material for production of a graphite electrode for steel-making and a carbon electrode for aluminum refining. |
