PURPOSE: To provide raw pitch for carbon fiber, which gives a carbon fiber having a high modulus and a high strength, by heat-treating a specified mixture consisting of a fraction and heavy oil obtd. by the steam cracking of petroleum and heavy oil obtd. by the fluid catalytic cracking of petroleum.
CONSTITUTION: A mixture consisting of heavy oil (A) having a b.p. of 200°C or higher obtd. by the steam cracking of petroleum, heavy oil (B) having a b.p. of 200°C or higher obtd. by the fluid catalytic cracking of petroleum, and hydrogenated oil (C) obtd. by hydrogenating 10W70% of the aromatic nucleus of arom. hydrocarbons contained in a fraction mentioned below by contacting in the presence of a hydrogenating catalyst with hydrogen a fraction having a boiling range of 160W400°C obtd. by the steam creacking of petroleum and/or a fraction having a boiling range of 160W400°Cobtd. by heat-treating at 380W 480°C heavy oil having a b.p. of 200°Cor higher obtd. by the steam cracking of petroleum, is used. Said mixture is heat-treated at 370W480°C under a pressure of 2W50kg/cm2 G to obtain the desired pitch.
YAMAMOTO SHIYUNICHI
HIROSE TAKAO
TAKASHIMA HIROAKI
KATOU OSAMU
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