Process for producing mesophase pitch

Patent · Tue Nov 29 04:00:00 EST 1988

OSTI ID:6384226

Isumi, T; Naito, T; Igarashi, S

This patient describes process for producing a mesophase pitch having a mesophase content of above 90% and a softening point of below 320/sup 0/ C. comprising the steps of: heat-treating a pitch forming material at elevated temperatures above about 380/sup 0/C for a time sufficient to provide a mixture of mesophase and non-mesophase pitch containing about 20% to about 80% (by weight) of mesophase and a softening point of no greater than 250/sup 0/C; aging and settling the mesophase portion of the mixture of mesophase and non-mesophase pitch obtained in step by maintaining the mixture in a substantially quiescent condition and at a temperature below the temperature in the heat-treating step, at which temperature the mixture is sufficiently liquid so that the separation of the mesophase and non-mesophase portions of the mixture can be substantially accomplished, (and above about 350/sup 0/C) for a time sufficient for the mesophase portion of the mixture to coalesce and accumulate into a substantially lower homogeneous mesophase pitch layer containing at least 90% mesophase and an upper layer comprising the non-mesophase portion of the mixture; and separating the lower mesophase layer from the upper non-mesophase layer whereby a mesophase pitch which has a mesopphase content of above 90% and a softening point below 320/sup 0/C is obtained. heat-treated at a temperature in the range of about 380/sup 0/C to about 460/sup 0/C whereby thermal cracking and polycondensation reaction occur.

• Assignee: Toa Nenryo Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US RE 32792
• OSTI ID: 6384226
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
AGING
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
DISPERSIONS
EVAPORATION
HEATING
HIGH TEMPERATURE
MIXTURES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PHASE TRANSFORMATIONS
PITCHES
PYROLYSIS
QUANTITY RATIO
SEPARATION PROCESSES
SYNTHESIS
THERMAL CRACKING
THERMOCHEMICAL PROCESSES