苯酚双氧水氧化法制邻、对苯二酚

CATECHOL AND HYDROQUINONE FROM HYDROXYLATION OF PHENOL BY HYDROGEN PEROXIDE

对苯酚、双氧水合成邻、对苯二酚的反应体系 ,采用苯酚溶液一次性加入反应器、双氧水连续滴加的半间歇操作方式 ,研究了苯酚与双氧水的摩尔配比、苯酚初浓度、双氧水滴加速率、反应温度等因素对苯酚转化率和邻、对苯二酚选择性的影响。在适宜的工艺条件下 ,苯酚的转化率可达到 40 %左右 ,苯二酚的总选择性可达到 90 %左右 ,邻 /对比为 1.6～ 1.8。

For the preparation of catechol and hydroquinone from catalytic hydroxylation of phenol by lower concentration aqueous hydrogen peroxide. In the experiment, aqueous phenol solution was added to the reactor in batch to hydrogen peroxide drop by drop. Effects of different molar ratio of phenol and hydrogen peroxide、initial concentration of phenol、reactive temperature etc. on conversion of phenol and selectivity of catechol and hydroquinone were investigated. Under the suitable conditions, the mixture gave 40% conversion of phenol and 90% selectivity of catechol and hydroquinone. The molar ratio of catechol and hydroquinone was 1.6~1.8.