CoX催化苯乙烯氧化-膜分离耦合连续反应工艺的研究

Study on continuous synthesis of oxidation of styrene catalyzed by CoX coupling with membrane separation

将细小的CoX催化苯乙烯氧化悬浮体系与无机膜分离耦合,实现了反应的连续操作,考察了温度、催化剂用量、溶剂量和搅拌速度对反应结果和膜通量的影响。结果表明膜分离过程不会对反应活性造成影响,操作过程中各因素对膜通量的影响归因于此条件下催化剂对膜孔的堵塞及其在膜表面的沉积程度,而超声是一个很好恢复膜通量的手段。在m(CoX)∶m(苯乙烯)=0.16、V(溶剂)∶V(苯乙烯)=3、反应温度100℃、停留时间6 h、搅拌速度800 r/min,跨膜压差0.03 MPa的条件下,苯乙烯的转化率达54.3%,环氧苯乙烷的选择性达到51.4%,苯甲醛选择性达到31.0%,膜通量为28.9 L/(m2.h)。

Continuous operation of the liquid oxidation of styrene reaction catalyzed very fine CoX catalyst was developed by coupling the suspension system with inorganic membrane separation. The effects of reaction temperatmre, the amount of catalyst, the amount of solvent and the agitation speed on the reaction and membrane flux are investigated. The results show that the process of membrane separation has no negative effect on the reaction, and the factors influencing membrane flux are attributed to the filling and aggradation of catalyst in membrane. Ultrasonic washing is the best way to the recovery of membrane flux. When the mass ratio of CoX to styrene is 0.16 ： 1, with 3 ： 1 of the volume ratio of solvent to styrene, 800 rpm of agitation speed,0.03 MPa of transmembrane presstcre,and reacting at 100℃ for 6 hours,the conversion of styrene can reach 54.3% ,and the selectivity of styrene oxide and benzaldehyde can be 51.4% and 31.0%,respectively,with the membrane flux of 28.9 L/（m^2·h）.