| 摘要 |
Poorly soluble peroxyacids obtained by reacting a solid carboxylic acid substrate with an Caro's acide solution can suffer from impaired purity. The purity of the product can be improved by preparing the Caro's acid solution in two stages, the first stage having an intermediate acidity (A value) of below 0.5 and thereafter in the second stage, by the introduction of further sulphuric acid, its A value is increased to the operating value that is often between 0.7 and 0.8. The second stage can be effected immediately prior to contact or in the presence of the carboxylic acid substrate. |
