对二甲苯催化氧化温度特性

Temperature characteristic of p-xylene catalytic oxidation

通过增大催化剂浓度使得160℃时的反应速率与191℃时的反应速率接近,实验研究了191℃和160℃下对二甲苯液相催化氧化的温度特性。研究发现,当反应温度从191℃降到160℃时,n(Co)/n(Mn)最佳配比改变、副反应减少、CTA的平均粒径减小、CTA中的4 CBA含量增大。

Experiments of pxylene liquidphase catalytic oxidation at 191 ℃and 160℃ were carried out to investigate the temperature characteristic. The reaction time at 191 ℃ and 160 ℃ were kept to be similar by increasing the catalyst concentration at 160 ℃. The result shows that when the reaction temperature decreases from 191℃ to 160 ℃, the best ratio of cobalt to manganese changes, the produced carbon dioxide and carbon monoxide reduce, the diameter of crude terephthalic acid becomes smaller and the content of 4CBA in crude terephthalic acid increases.