| 摘要 |
<p>Method for the reduction of acid mineral impurities in sulphonic acid. The method consists in subjecting sulphonic acid to a heat treatment at a temperature of 70-100 °C under agitation and with nitrogen bubbling so as to obtain an SO4H2 residual content of 0.3 % by weight. Such a method avoids the formation of sediments which are difficult to filter, during neutralization of the sulphonic acid.</p> |
