Process for the preparation of mesophase pitches

Patent · Thu May 11 04:00:00 EDT 1989

OSTI ID:5921981

Tsuchitani, M; Naito, S; Nakajima, R

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
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
04 OIL SHALES AND TAR SANDS
040403 -- Oil Shales & Tar Sands-- Refining
ALKYLATED AROMATICS
AROMATICS
AZAARENES
AZINES
CARBON FIBERS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
FABRICATION
FIBERS
HEATING
HETEROCYCLIC COMPOUNDS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
MELTING POINTS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PITCHES
PRODUCTION
PYRIDINES
QUINOLINES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VISCOSITY
XYLENES