Process for the preparation of an intermediate pitch for manufac

Details Process for the preparation of an intermediate pitch for manufac Process for the preparation of an intermediate pitch for manufac

1986-04-08

1987-11-10

Konopka, Paul E.

Mineral oils: processes and products

Asphalts, tars, pitches and resins; making, treating and...

Chemical modification of asphalt, tar, pitch or resin

208 40, 264 292, 4234471, 4234472, 4234474, C10C 302, C10C 300, D01F 912

Patent

active

047056185

ABSTRACT:
Until now, it has not yet been succeeded to prepare high performance carbon fibers having satisfactory strength from heavy oils of coal or petroleum origin. We now succeeded to prepare an excellent intermediate pitch which allows the preparation of high performance carbon fibers having tensile strength of higher than 300 Kg/mm.sup.2 and Young's modulus of 50 ton/mm.sup.2.
The intermediate pitch can be obtained by heating a heavy oil of coal or petroleum origin in a tubular heater under a specific conditions, and then flash distilling the heater effluent in a flash distillation column under a specific condition so as to remove lighter fractions and recovering heavy fraction from the column bottom as the intermediate pitch. The process for the preparation of the intermediate pitch is simple and economical and allows continuous production without fluctuation of quality of the intermediate pitch. The intermediate pitch is also suitable for the production of higher density carbon products.

REFERENCES:
patent: 2850436 (1958-09-01), Beuther
patent: 3140248 (1964-07-01), Bell et al.
patent: 4049538 (1977-09-01), Hayashi et al.
patent: 4177133 (1979-12-01), Hayashi et al.
patent: 4472265 (1984-09-01), Otani
patent: 4518482 (1985-05-01), Dickakiam
patent: 4522701 (1985-06-01), Dickakiam
patent: 4528087 (1985-07-01), Shibatani
patent: 4589975 (1986-05-01), Yudate

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