To provide a method for producing an aqueous ionic compound solution, capable of decreasing an amount of a desired cation salt to be used and further capable of decreasing salts other than the desired cation salt by one-step membrane separation.
This method for producing the aqueous ionic compound solution includes processes (a) to (c) as follows: (a) a process for mixing an aqueous solution containing an ionic compound having a water-soluble group with a hydrophobic amine and a hydrophobic organic solvent and conditioning the mixture to be strongly acidic, so as to obtain an organic phase containing a salt of an anion formed out of the ionic compound and an ion formed out of the hydrophobic amine; (b) a process for mixing the organic phase obtained by the process (a) with a compound containing a cation as an aqueous solution and conducting liquid separation, so as to obtain an aqueous phase containing a salt of the anion formed out of the ionic compound and the cation; and (c) a process for removing an inorganic salt from the aqueous phase obtained by the process (b) by an electrodialyzer, so as to obtain an aqueous solution containing an anion of which the counter ion is the cation and which is formed out of the ionic compound.
UCHIYAMA MINORU
KURUMAYA MASAHIKO
Toru Nakayama
Masayuki Enomoto
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