H_2O超声过程中H_2O_2生成动力学

PRODUCTION DYNAMICS OF H_2O_2 DURING SONOLYSIS OF H_2O

采用 5 0kHz超声清洗槽式声化学反应器 ,以纯水为空化液体 ,研究了超声过程中H2 O2 生成动力学 .分别探讨了空化气体种类 (Ar,O2 )及组成与流量、空化液体体积与反应器形状对H2 O2 生成速率及产率的影响 .结果表明 ,超声过程中H2 O2 的生成可采用零级反应动力学方程来进行描述 .在此频率下和考察范围内 ,采用Ar作为空化气体比O2 更有利于H2 O2 的生成 .当混合气体组成为Ar∶O2 =70∶30 (V/V)时 ,H2 O2 的生成速率最快 .随着空化气体流量的增加 ,H2 O2 产率增加 ,随后降低 .增加空化液体的体积 ,H2 O2 的生成速率降低 .与锥形瓶相比 ,圆底烧瓶中H2 O2

The production dynamics of H 2O 2 during sonolysis of H 2O in an ultrasonic cleaning bath(50 kHz,output power 150 W)has been studied.The parameters such as operating gas(argon/oxygen)composition,operating gas flow rate,sonication liquid volume and the configuration of the reactors have been investigated.The experimental results show that the production of H 2O 2 accords with zero order reaction dynamics.Argon as operating gas is more favorable for the production of H 2O 2 than oxygen.The H 2O 2 yield reaches a maximum at the ratio of Ar/O 2=70/30( V/V ).The rate of H 2O 2 production first increases with increasing operating gas flow rate,then decreases.The increases in liquid volume reduce the oproction rate of H 2O 2.In comparison with conical flask,the production of H 2O 2 in round bottom flask is much lower.