Ihi Corporation

Kumiko Yoshihisa

Nobuhiko Kubota

Junichi Okuyama

Takahiro Matsuo

Kazuo Uematsu

Yasunori Hamano

Muneo Ayabe

Disclosed is a method for producing perchlorate, which comprises: an electrolytic step (S) wherein an electrolysis vessel (), in which a positive electrode side (A) on which a positive electrode () is arranged and a negative electrode side (A) on which a negative electrode () is arranged are divided by a cation-exchange membrane (), is used and an aqueous solution of sodium chlorate is electrolytically oxidized on the positive electrode side (A) of the electrolysis vessel (); a neutralization reaction step (S) wherein a substance an aqueous solution of which shows alkalinity is added to the aqueous perchloric acid solution that has been produced by the electrolytic oxidation on the positive electrode side, so that perchlorate is synthesized by a neutralization reaction; and a crystallization process wherein the perchlorate synthesized by the neutralization reaction is obtained as crystals. The crystallization process is composed of an evaporative crystallization step (S), or alternatively composed of three steps, namely an evaporative concentration step (S), a cooling crystallization step (S), and a separation step (S).

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Yokohama, Japan

Kumiko Yoshihisa