苯乙烯环氧化反应的研究

Investigation on Epoxidation of Styrene

以分子氧为氧化剂,异丁醛为共还原剂、醋酸钴为催化剂,苯乙烯可被氧化成环氧苯乙烷和苯甲醛。为了得到高产率的产品环氧苯乙烷,采用响应曲面法(RSM)考察了醛用量、催化剂用量、溶剂比对反应结果的影响,得到最佳反应条件下产品的总得率为72.9%,环氧苯乙烷和苯甲醛的选择性分别为53.1%和20.7%,并建立了相应的预测模型。根据实验结果,进一步计算了苯乙烯氧化反应的活化能,生成环氧苯乙烷和苯甲醛的活化能分别为34.69 k J/mol和38.23 k J/mol,表明低温有利于提高环氧苯乙烷产品的选择性。

With molecular oxygen as oxidant, isobutyraldehyde as co-reducing agent and cobalt acetate as catalyst, styrene can be oxidized to styrene oxide and benzaldehyde. In order to obtain the high yield product styrene oxide, response surface methodology (RSM) was used to investigate the aldehyde dosage, catalyst dosage, and volume ratio of solvent to styrene on the reaction process and results. Under the optimal reaction conditions, the total yield of the product was 72.9%, the selectivity of styrene oxide and benzaldehyde was 53.1% and 20.7%, respectively. The corresponding prediction model was also established. According to the experimental results, the activation energy of styrene oxidation reaction was further calculated, and the activation energies of styrene oxide and benzaldehyde were 34.69 kJ/mol and 38.23 kJ/mol, respectively, indicating that low temperature was beneficial to improve the selectivity of styrene oxide products.