Process for the preparation of mesophase pitches
A process is described for preparing a mesophase pitch with a Mettler method softening point of lower than 320/sup 0/C, a mesophase content of higher than 90% when examined on a polarized microscope, a quinoline insoluble content of lower than 20% and a xylene soluble content of lower than 20% for manufacturing high performance carbon fibers comprising: (a) subjecting a heavy oil of petroleum or coal origin, or a heavy component obtainable from the heavy oil, the oil or component having substantially no xylene insoluble component, to a heat treatment in a tubular heater at a temperature of 400/sup 0/ to 600/sup 0/C under a pressure of 1 to 100 Kg/cm/sup 2/.G measured at the outlet of the tubular heater for 1 to 2000 sec so as to obtain a heat-treated material having 3 to 30 wt% of xylene insoluble component; (b) adding to the thus heat-treated material a monocyclic aromatic hydrocarbon solvent in an amount of 1 to 5 times on the heat-treated material, and recovering the newly formed insoluble component as an essentially isotropic high molecular weight bituminous material; (c) subjecting the high molecular weight bituminous material to a hydrogenation treatment at a temperature of 400/sup 0/ to 460/sup 0/C and a pressure of 20 to 200 Kg/cm/sup 2/.G with the addition of 1 to 5 times amount of a hydrogen-donating solvent based on the high molecular weight bituminous material thereby obtaining an essentially isotropic hydrogenated pitch; and (d) heat treating the hydrogenated pitch at 350/sup 0/ to 500/sup 0/C under a pressure up to atmospheric pressure to convert the hydrogenated pitch into the mesophase pitch.
- Assignee:
- Kozo Iizuka and Maruzen Petrochemical Co., Ltd., Tokyo
- Patent Number(s):
- US 4820401
- OSTI ID:
- 5921981
- Resource Relation:
- Patent File Date: Filed date 11 May 1987
- Country of Publication:
- United States
- Language:
- English
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Process for the manufacture of carbon fibers and feedstock therefor
Process for producing mesophase pitch
Related Subjects
04 OIL SHALES AND TAR SANDS
CARBON FIBERS
FABRICATION
PITCHES
HYDROGENATION
CHEMICAL COMPOSITION
HEATING
HIGH TEMPERATURE
MELTING POINTS
PRODUCTION
QUINOLINES
VISCOSITY
XYLENES
ALKYLATED AROMATICS
AROMATICS
AZAARENES
AZINES
CHEMICAL REACTIONS
FIBERS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PYRIDINES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
020400* - Petroleum- Processing
040403 - Oil Shales & Tar Sands- Refining