Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and... – Chemical modification of asphalt – tar – pitch or resin
Patent
1994-10-28
1996-02-27
Myers, Helane
Mineral oils: processes and products
Asphalts, tars, pitches and resins; making, treating and...
Chemical modification of asphalt, tar, pitch or resin
208 22, 208 39, 4234472, 4234476, C10C 302
Patent
active
054945674
ABSTRACT:
A process for producing an optically isotropic reformed pitch useful for various carbon materials is provided. This process comprises mixing a pitch having a ratio of aromatic hydrocarbon fa of more than 0.6 with a strong Lewis acid and a co-solvent so as to give a mol ratio of the said Lewis acid to the said pitch in the range of 0.3.about.5.0 and a mol ratio of the said co-solvent to the said pitch in the range of ratio of 2.5.about.50, reacting the mixture at a temperature of 100.degree..about.300.degree. C. and removing the Lewis acid and the co-solvent from the reaction product. Meso-Carbon microbeads having a uniform diameter of 20 .mu.m or less can be produced at a high yield of 60% or more by heat treating the said reformed pitch at 200.degree..about.380.degree. C. to produce the optically anisotropic small spheres and separating them from an optically isotropic matrix.
REFERENCES:
patent: 4146576 (1979-03-01), Wyss
patent: 4414095 (1983-11-01), Dickakian
patent: 4431513 (1984-02-01), Lewis
patent: 4457828 (1984-07-01), Lewis
patent: 4488957 (1984-12-01), Noguchi et al.
patent: 4715945 (1987-12-01), Dickakian
patent: 4789455 (1988-12-01), Mochida et al.
patent: 4891126 (1990-01-01), Mochida et al.
Myers Helane
Petoca Ltd.
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