| 摘要 |
PURPOSE:To obtain pitch for carbonaceous materials of good quality suitable for producing carbon fibers with high efficiency, by introducing a carbonaceous pitch into a thin film evaporator, and heat-treating the pitch in the presence of an inert gas, etc. CONSTITUTION:A carbonaceous pitch, preferably containing 100% mesophase for producing carbon fibers is introduced into a thin film evaporator and heat-treated in the presence of an inert gas or nonoxidizing gas at 400-550 deg.C under 0.1- 50mm.Hg pressure to give the aimed pitch for producing carbonaceous materials. In case the heat treatment is carried out in two stages, the heat treatment in the first stage is carried out under the following conditions; 400-450 deg.C under 10- 50mm.Hg pressure in the first stage and 450-550 deg.C under 0.1-5mm.Hg pressure in the second stage.
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