A HYDROGENATION CATALYST FOR COAL TAR,A METHOD OF HYDROGENATION OF COAL TAR WITH USE OF SUCH CATALYST,AND A METHOD OF PRODUCING SUPER NEEDLE FROM THE HYDROGENATION PRODUCT OF COAL TAR

摘要

Described is the method of producing the super needle coke from graphite electrodes, wherein the starting material derived from coal tar or the starting material derived from coal tar and containing less than 0.1 weight percent of the dry sludges or quinoline insolubles is subjected to hydrogenation in the present of hydrogenation catalyst to give the hydrogenated oil which is further subjected to thermal cracking under the controlled condition and non-volatile components contained in thermally cracked oil are removed to give the starting coking material from the distillate these of which is subjected to delayed coking. The thermal cracking conditions are selected from the conditions in which the pressure range is up to 3.9 MPa (40 kg/cm2G.). The temperature is 470 DEG to 520 DEG C. and the cold residence time is to to 350 seconds, while the coking conditions are selected from the conditions in which the temperature ranged is over 450 DEG to 465 DEG C. and the pressure range is over 0.19 to 0.98 MPa (2 to 10 Kg/cm2G).