PRODUCTION OF MESOPHASE PITCH

摘要

PURPOSE:To produce the title pitch having a low softening point, a high mesophase content, a low quinoline-insoluble matter content and a low xylene-soluble matter content, by heating a specified high-molecular bitumen under a reduced pressure or in an inert gas stream. CONSTITUTION:Coal or petroleum heavy oil or a heavy oil component obtd. by distilling or heat-treating said heavy oil is added to a monocyclic arom. hydrocarbon solvent in an amount of 1-3 times that of the heavy oil. The resulting insoluble matter is removed by centrifugation or filtration. The monocyclic hydrocarbon is then removed by distillation to obtain the purified heavy oil or heavy component. The purified product is then heated at 450-550 deg.C under a pressure of 4-50kg/cm<2>G and at a residence time of 30-1,000sec in a tubular heating oven in the presence or absence of arom. oil which is used in an amount of 0-1 time as much as that of said purified product and in which no matter insoluble in the monocyclic arom. hydrocarbon solvent is formed when heat-treated at 200-450 deg.C. The monocyclic arom. hydrocarbon solvent in an amount of 1-3 times that of the purified heavy oil is added thereto. The resulting insoluble matter is removed to obtain a high-molecular bitumen. The bitumen is heated in the presence of a hydrogen-donating solvent, hydro genated and then heated under a reduced pressure or in an inert gas stream.