Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and... – Solvent extraction
Patent
1987-02-24
1988-07-12
Dees, Carl F.
Mineral oils: processes and products
Asphalts, tars, pitches and resins; making, treating and...
Solvent extraction
208433, 4234474, C10C 118
Patent
active
047568186
ABSTRACT:
A method for the production of a carbon fiber precursor from coal tar pitch comprising extracting coal tar pitch at elevated temperatures and pressures with a mixture of a supercritical gas and an entraining agent to obtain a solution free of quinoline-insoluble components, recovering from the solution by lowering the pressure and/or raising the temperature to obtain at least one fraction selected from the group consisting of quinoline-soluble fraction and toluene-soluble fraction, treating the said fraction(s) at 380.degree. to 450.degree. C. under a non-oxidizing atmosphere at atmosphere pressure until 40 to 65% by volume of the product is converted into pitch containing mesophase, extracting the latter pitch with a mixture of supercritical gas and an entraining agent to remove isotropic pitch and recovering isotropic pitch with a mesophase content of at least 75% by volume, a pyridine-insoluble matter content of 20 to 50% by weight, a mean molecular weight of 900 to 1200 and a melting point of 330.degree. to 360.degree. C. and the isotropic pitch product produced therefrom and carbon fibers made from the isotropic pitch.
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Beneke Herbert
Fexer Wolfgang
Jaumann Wolfgang
Kempfert Joachim
Meinbreckse Manfred
Dees Carl F.
Myers Helane
Rutgerswerke Aktiengesellschaft
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