Method of producing high quality, high purity, isotropic graphit

Details Method of producing high quality, high purity, isotropic graphit Method of producing high quality, high purity, isotropic graphit

1994-09-12

1998-01-06

Lewis, Michael

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

423448, C10C 118

Patent

active

057051399

ABSTRACT:
Ultra-clean isotropic coke is obtained from bituminous coal by extracting such coal following the extraction procedure described in U.S. Pat. No. 4,272,346, issued Jun. 9, 1981, to Stiller et al., using, for example, N-Methyl Pyrrolidone as the extraction solvent, and subjecting the extracted solids after separation of the solvent to a conventional coking heat treatment. The isotropic coke thus obtained can be ground, mixed with conventional binder pitch and shaped into carbon products which can be used directly, e.g. as carbon electrodes, or can be subjected to a graphitizing heat treatment under the usual conditions to produce isotropic graphite structures of high purity and high quality. The graphitization can be a multi-stage procedure and the porous intermediate stage products can be impregnated with a conventional impregnating pitch for increased density, the impregnating pitch being graphitized in the subsequent stage.

REFERENCES:
patent: 4029749 (1977-06-01), Murakami
patent: 4272356 (1981-06-01), Stiller et al.
patent: 4300994 (1981-11-01), Liotta
patent: 4534951 (1985-08-01), Kortovich et al.
patent: 4891203 (1990-01-01), Singer et al.

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