Method of purifying coal tars for use in the production of carbo

Details Method of purifying coal tars for use in the production of carbo Method of purifying coal tars for use in the production of carbo

1988-07-19

1989-10-17

Konopka, Paul E.

Mineral oils: processes and products

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

Solvent extraction

208 22, 208 42, 264 292, 4234471, 4234474, C10C 108, C10C 104, D01F 912, D01F 914

Patent

active

048745022

ABSTRACT:
The unwanted components from coal tars should be removed at a certain stage of the process for producing homogeneous spinning pitches which are suitable for use in the production of high-performance carbon fibers from coal tars. The unwanted components can be eliminated from coal tars in a very efficient manner by the following procedures: subjecting the coal tars to distillation or flash distillation so as to separate a heavy component having a boiling point higher than a predetermined temperature, dissolving the heavy component in a monocyclic aromatic hydrocarbon solvent, and subjecting the solution to filtration or centrifugation.

REFERENCES:
patent: 4277235 (1981-07-01), Greenwood
patent: 4402928 (1983-09-01), Lewis et al.
patent: 4575412 (1986-03-01), Yudate et al.
patent: 4578177 (1986-03-01), Yudate et al.
patent: 4758326 (1988-07-01), Obsugi et al.
patent: 4820401 (1989-04-01), Tsuchitani et al.

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