Mitsubishi Rayon Company, Limited

Yoshio Manabe

Osamu Kato

Kozi Nishida

Yukio Kasabo

Toshihiro Maxima

There are disclosed a method of purifying a polyacrylonitrile which comprises removing iron compounds or ions thereof and aluminum compounds or ions thereof which can be contained as impurities in a polyacrylonitrile obtained by aqueous suspension polymerization using an inorganic redox initiator, from a solution consisting of said polyacrylonitrile and an organic solvent capable of dissolving said polyacrylonitrile, by the use of a substance having ion-exchanging ability which is insoluble in said organic solvent; a process for producing fiber from the polyacrylonitrile thus purified; and a process for producing carbon fiber from said fiber.

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Otake, Japan

Yoshio Manabe