Method and apparatus for manufacturing perchlorate
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United States of America Patent
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Jul 28, 2015
Grant Date -
Jan 26, 2012
app pub date -
Mar 26, 2010
filing date -
Mar 26, 2009
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Abstract
Disclosed is a method for producing perchlorate, which comprises: an electrolytic step (S1) wherein an electrolysis vessel (2), in which a positive electrode side (4A) on which a positive electrode (4) is arranged and a negative electrode side (5A) on which a negative electrode (5) is arranged are divided by a cation-exchange membrane (6), is used and an aqueous solution of sodium chlorate is electrolytically oxidized on the positive electrode side (4A) of the electrolysis vessel (2); a neutralization reaction step (S2) 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 (S3), or alternatively composed of three steps, namely an evaporative concentration step (S21), a cooling crystallization step (S22), and a separation step (S23).
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