| 摘要 |
PURPOSE:To obtain pitch useful for preparing especially carbon fiber, having a low softening point and improved spinnable properties, by using a heavy oil obtained by fluid catalytic cracking of petroleum, etc. and a residual oil fraction of hydrogenation product of petroleum heavy oil as raw materials. CONSTITUTION:A mixture of (A) a heavy oil having >=200 deg.C boiling point obtained by fluid catalytic cracking or thermal cracking and (B) a residual oil fraction of a formed oil obtained by hydrogenating a petroleum heavy oil is heat-treated at 350-450 deg.C (preferably at 380-420 deg.C), to give pitch usually containing 30-80wt% mesophase, from which pitch substantially containing 100wt% mesophase is separated. A heavy oil having 200-450 deg.C boiling point among a reaction product obtained by fluid catalytic cracking of gas oil, normal-pressure residual oil, etc. in the presence of a silica alumina catalyst, etc. at 450-550 deg.C may be cited as the component A. |
