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US 5,494,567 AGranted
Process for producing carbon materials
AssigneePetoca, Ltd.
InventorToshio Tamaki
Life of this patent
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AssigneePetoca, Ltd.
InventorToshio Tamaki
Estimating the term…
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.
A process for producing an optically isotropic reformed pitch useful for carbon materials which consists essentially of mixing a pitch having an aromatic carbon ratio fa of more than 0.6, with one Lewis acid selected from the group consisting of anhydrous AlCl.sub.3 and HF.BF.sub.3 and a co-solvent selected from the group consisting of dichlorobenzene, nitrobenzene and trichlorobenzene in an amount sufficient to dissolve both the said pitch and the said Lewis acid and promote a reaction in the liquid state, so as to give a mol ratio of the said Lewis acid to the said pitch in the range of 0.3-5.0 and a mol ratio of the said co-solvent to the said pitch in the range of 2.5-50, reacting the mixture at a reaction temperature of 100.degree.-300.degree. C., and removing the said Lewis acid and the said co-solvent from the resulting reaction product.
A process for producing an optically isotropic reformed pitch useful for carbon materials which consists essentially of mixing a pitch having an aromatic carbon ratio fa of more than 0.6, HF.BF.sub.3 and a co-solvent selected from the group consisting of dichlorobenzene, nitrobenzene and trichlorobenzene in an amount sufficient to dissolve both the said pitch and the said HF.BF.sub.3 and promote a reaction in the liquid state, so as to give a mol ratio of the said HF, BF.sub.3 and co-solvent to the said pitch in the range of 1-5, 0.3-1 and 2.5-50, respectively, reacting the mixture at a reaction temperature of 100.degree.-300.degree. C., and removing the said HF, BF.sub.3 and the said co-solvent from the resulting reaction product.
Dependencies are inferred from the claim text.