Process for producing mesophase pitch

Details Process for producing mesophase pitch Process for producing mesophase pitch

1986-11-03

1988-11-29

Sneed, Helen M. S.

Mineral oils: processes and products

Asphalts, tars, pitches and resins; making, treating and...

Chemical modification of asphalt, tar, pitch or resin

208 40, C10C 300

Patent

active

RE0327921

ABSTRACT:
A substantially uniform mesophase pitch is prepared by treating a mesophase forming pitch material at elevated temperatures above about 380.degree. C. to produce a mixture of mesophase and non-mesophase pitch containing about 20% to about 80% mesophase. The mixture is then maintained at a temperature below about 400.degree. C. for a time sufficient to allow the mesophase to coalesce and settle as a lower separable layer. A mesophase pitch so produced may contain from 90 to 100% mesophase with a softening point of less than 320.degree. C.

REFERENCES:
patent: 2896261 (1959-07-01), McAfee
patent: 3976729 (1976-08-01), Lewis et al.
patent: 4026788 (1977-05-01), McHenry
patent: 4033430 (1977-06-01), Lewis
patent: 4184942 (1980-01-01), Angier et al.
patent: 4488957 (1984-12-01), Noguchi et al.
patent: 4529498 (1985-07-01), Watanabe

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