| 摘要 |
<p>A process by which an aqueous solution of a tetraalkylammonium hydroxide remarkably lowered in the content of metal ions such as alkali metal ions can be prepared in a high yield and by a simple means. A high-purity aqueous solution of a tetraalkylammonium chloride substantially free from metal ions such as alkali metal ions can be prepared by reacting a high-purity trialkylamine with a high-purity alkyl chloride in high-purity water; and the electrodialysis of this solution in the form of an aqueous solution without being preceded by evaporation to dryness can give a remarkably high-purity aqueous solution of a tetraalkylammonium hydroxide in a high yield with little lowering in the purity.</p> |
