The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 1991
Filed:
Feb. 29, 1988
Tohru Iwahashi, Ibaraki, JP;
Yoshihiko Sunami, Ibaraki, JP;
Katsumi Satoh, Tokyo, JP;
Katsuyuki Ohshima, Ibaraki, JP;
Kenichi Iwaguro, Funabashi, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Sumikin Chemical Co. Ltd., Tokyo, JP;
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A process for refining coal-derived heavy carbonaceous materials such as pitch to remove quinline insolubles therefrom is disclosed. The process comprises providing a coal-derived heavy carbonaceous material from which all the components having normal boiling points of 270.degree. C. or below and all or part of the components having normal boiling points ranging from 270.degree. C. to 360.degree. C. have been removed; heating the heavy carbonaceous material to make it fluid; mixing the heated carbonaceous material with a ketone solvent having a boiling point below 200.degree. C. for a period sufficient to precipitate coarse insoluble particles in the mixture; separating the precipitated particles from the mixture; and removing the ketone solvent from the mixture, leaving a refined, coal-derived heavy carbonaceous material which is suitable for use in the production of high-grade carbon stocks such as needle coke, carbon fibers, high-purity carbon, etc., and for use as an impregnant or binder pitch.