Process for the preparation of an intermediate pitch for manufacturing carbon products

Patent · Tue Nov 10 04:00:00 EST 1987

OSTI ID:5699330

Tsuchitani, M; Nakajima, R

A process for the continuous preparation of an almost optically isotropic and substantially homogeneous intermediate pitch with a benzene insoluble fraction content of more than 50 wt %, a quinoline insoluble fraction content of less than 30 wt % and a beta-resins content of more than 40 wt % for manufacturing a mesophase pitch for preparing carbon fibers is described which comprises heating a heavy oil having a quinoline insoluble fraction content of less than 5 wt % selected from the group consisting of coal tars, coal tar pitches tar by-products from naptha cracking, tar by-products from gas oil cracking and decant oils, in a tubular heater under a pressure of 4 to 50 Kg/cm/sup 2/.G at a temperature of 400/sup 0/ to 520/sup 0/C with a residence time of 30 to 1000 sec. Transfer the heater effluent to a flash distillation column and conduct flash distillation under a pressure of 0.3 to 1.5 Kg/cm/sup 2/.A at a temperature of 430/sup 0/ to 500/sup 0/C so as to separate lighter fractions as the overhead of the column from a heavy fraction and recovering the heavy fraction from the bottom of the column as the intermediate pitch.

• Assignee: Maruzen Petrochemical Co., Ltd., Tokyo
• Patent Number(s): US 4705618
• OSTI ID: 5699330
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
02 PETROLEUM
020400 -- Petroleum-- Processing
ANTHRACENE
AROMATICS
AZAARENES
AZINES
BENZENE
CARBON FIBERS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COAL TAR
CONDENSED AROMATICS
CREOSOTE
DISTILLATION
ENERGY SOURCES
FIBERS
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
ISOTROPY
NAPHTHALENE
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PETROCHEMICALS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PITCHES
POLYMERS
PRESSURE DEPENDENCE
PRODUCTION
PYRIDINES
QUINOLINES
RESINS
SEPARATION PROCESSES
SOLVENT PROPERTIES
SYNTHESIS
TAR
TEMPERATURE DEPENDENCE