I made perchloric acid by salt metathesis from KClO4: description.
The process is quite complicated, because I had to avoid the crystallization of ammonium perchlorate due to legal regulations in my country (it's
considered an explosive here).
You can simply add a hot ammonium tartrate solution to a hot solution of KClO4 with tartaric acid. Let it cool, filter off the cream of tartar. The
filtrate contains about 75 % ammonium perchlorate, the rest (25 %) of the perchlorate will remain in the precipitate. This also can be recycled
(dissolve the cream of tartar with Na2CO3 solution, the KClO4 will remain and can be reused). The crude ammonium perchlorate has to be recrystallized.
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