一种环氧苯乙烷合成新工艺

A new synthesis process of epoxyethylbenzene

提出以MgCO3在700℃焙烧制得的MgO为催化剂,双氧水为氧化剂催化氧化苯乙烯合成环氧苯乙烷的新工艺。优化得到较佳工艺条件为:苯乙烯为0.47 mL(4.0 mmol),n(H2O2)∶n(苯乙烯)=6∶1,V(乙腈)∶V(苯乙烯)=10∶1,MgO为50mg,NaOH为10 mg,反应温度为60℃,反应时间为10 h。在此条件下,苯乙烯转化率达95.0%,环氧苯乙烷选择性达92.0%。

A new process of the epoxidation of styrene to epoxyethylbenzene using Ha O2 as oxidant and MgO as catalyst which is prepared by calcining MgCO3 at 700℃, is developed. The optimized reaction conditions are shown as follows：0. 47 mL （4. 0 mmol） of styrene,6：1 molar ratio of H2O2 and styrene,10：1 of volume ratio of acetonitrile and styrene,50 mg of MgO, 10 mg of NaOH,60℃ and 10 h. The conversion of styrene is 95.0% and the selectivity to epoxyethylbenzene is 92. 0%, respectively.