Fuji Standard Research, Inc.

Sumitomo Metal Industries, Inc.

Fumio Mogi

Sugio Otani

Shimpei Gomi

Tomio Arai

Takao Nakagawa

Kunio Miura

Noriaki Oshiguri

A continuous process of producing carbonaceous pitch, including heat-treating an aromatic heavy oil for obtaining a first cracked product, and thermally cracking the first product in a cracking zone by direct contact with a gaseous heat transfer medium to obtain distillable cracked components and a mesophase-containing pitch. A first portion of the liquid phase in the cracking zone, including the mesophase-containing pitch, is separated into a mesophase-rich pitch and a matrix pitch having a low concentration of mesophase. The mesophase-rich pitch is recovered while at least a portion of the matrix pitch is recycled to the cracking zone. The distillable cracked components are withdrawn from the cracking zone and separated into light, middle and heavy fractions. At least a portion of the heavy fraction is heat treated and is recycled to the cracking zone. A least a portion of the middle fraction and/or a portion of the heavy fraction is hydrotreated to obtain a hydrogen-donating oil which is then reacted with a second portion of the liquid phase to hydrogenate the mesophase contained therein, the reaction product being recycled to the cracking zone.

Process of producing carbonaceous pitch

A method of preparing an carbonaceous pitch, including the steps of:

Method of preparing carbonaceous pitch

A process for the preparation of carbon fibers, including the steps of:

Process for the preparation of carbon fibers

A novel reformed mesophase pitch having a mesophase content MC of between 40 and 100%, a quinoline-insoluble content QI of between 5 and 70 weight % and anisotropic domains forming a continuous phase. The reformed mesophase pitch is obtained by heat-treating a dormant mesophase pitch which comprises dormant anisotropic components which are partially hydrogenated, polycyclic polycondensed ring aromatic hydrocarbons derived from the mesophase of a mesophase pitch by hydrogenation of the mesophase and which are soluble in quinoline. The dormant mesophase pitch is optically isotropic in nature but, upon being subjected to shear forces in one direction, capable of being oriented in said direction. Preferably, the reformed mesophase pitch has a softening point SP in .degree.C. satisfying the following conditions:

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Tokyo, Japan

Fumio Mogi