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2. 发明公开

EP0393724A1 Process for preparing mesophase pitches 失效
标题翻译：一种中间相过程节距生产。
公开(公告)号：EP0393724A1
公开(公告)日：1990-10-24
申请号：EP90109689.1
申请日：1988-06-16
申请人： MARUZEN PETROCHEMICAL CO., LTD.
发明人： Tsuchitani, Masatoshi , Tamura, Makoto , Suzuki, Kiyotaka, E-5404, Maruzen Sekiyu Kagaku , Okada, Shuji, B-2402, Maruzen Sekiyu Kagaku , Nakajima, Ryoichi , Naito, Sakae
IPC分类号： C10C1/00 , C10C3/00
CPC分类号： C10C1/00 , C10C3/00
摘要： A process for the preparation of an excellent mesophase pitch suitable for use as a spinning pitch for the production of high-performance carbon fibers is disclosed. The mesophase pitch can satisfy the four remarkable characteristics at the same time, i.e., a Mettler method softening point of below 310°C, a mesophase content of above 90% as examined on a polarized microscope, a quinoline insoluble content of less than 10 wt%, and a xylene soluble content of less than 10 wt%. The mesophase pitch is particularly homogeneous and is easily spinnable. The process can be characterized by using a heavy oil or pitch having substantially no BTX-insoluble material as the starting raw material, subjecting the raw material to a simple four-step treatment of (1) a continuous heat treatment in a tubular heater, (2) a distillation operation, (3) a BTX-solvent extraction and (4) a distillation operation; while recycling a soluble component obtained in the step (4) to the heat treatment of step (1) and recovering a BTX-solvent insoluble component formed in step (3) as the material for hydrogenation treatment and succeeding final heat treatment for converting into a mesophase pitch. This feature can provide a significant increase in the yield of a mesophase pitch. Furthermore, unexpectedly, the recycle of the soluble component into the heat treatment of step (1) is helpful to improve the characteristics of the ultimate products, i.e., carbon fibers or graphite fibers. The process of the present invention can provide a carbon fiber having a tensile strength of more than 2942 MPa (300 kg/mm²) and a graphite fiber having a tensile strength of more than 3923 MPa (400 kg/mm²) and a modulus of elasticity of more than 588 GPa (60 ton/mm²).

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