| 摘要 |
PURPOSE:To obtain a needle coke suitable for use as a starting material for artificial graphite electrodes and having a high quality in a high yield, by treating a raw material comprising a hydrogenated coal tar at a specific temp. in an atmosphere free from oxygen, followed by coking. CONSTITUTION:In producing a pitch coke from a raw material comprising a hydrogenated coal tar, the raw material comprising a hydrogenated coal tar is heat-treated at 340-500 deg.C in an atmosphere free from oxygen, followed by coking. A preferred raw material comprising a coal tar is a tar pitch. Although the tar pitch may be any of a soft pitch having a softening point of 70 deg.C or below, a medium pitch having a softening point of 70-85 deg.C and a hard pitch having a softening point 85 deg.C or above, the soft pitch is preferable from the standpoint of handleability. The degree of hydrogenation is generally in the range of 15-70%, preferably 25-60% in view of the degree of de nitrification.
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