微波强化膨润土的改性及其作用机理  

Modification of Bentonite by Microwave Irradiation and Its Mechanism

作　　者：韦藤幼[1] 曹玉红[1] 童张法[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《过程工程学报》2005年第4期411-413,共3页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:29806004);广西自然科学基金资助项目(编号:桂科配9912029)

摘　　要：在半干条件下采用微波辐射,制备了钠基及有机膨润土.实验方法为先用溶解有改性剂的少量乙醇溶液与原料膨润土混合,然后把所得到的半干物料置于微波场中进行加热反应,最后通过洗涤、过滤及干燥得到产品.与传统的湿法改性相比较,微波半干法不但钠化和有机化反应时间分别缩短60倍和90倍,而且由于反应后洗涤及过滤容易,产率分别提高11.5%和16%.通过对影响反应的因素进行分析,探讨了微波的作用机理,认为微波辐射加快了传质速度,当膨润土颗粒粒径小于355μm及微波辐射强度大于50W/g时,传质速度已超过反应速度,过程受反应控制.Na-bentonite and organic-bentonite were prepared by using microwave radiation in the half-dry process. A small amount of ethanol in which a modifier was dissolved was mixed with the raw material, bentonite. Then, the obtained half-dry mixture was heated by microwave irradiation. Finally, the modified bentonite was treated by washing, filtering and drying. Compared with the traditional wet process, the proposed method not only shortened the reaction time by 60～90 times but also improved productivity by 11.5%～16% because of easy washing and filtering after microwave radiation. The mechanism of microwave effect on the improved process was explored by analyzing reaction factors. It was considered that the microwave irradiation enhanced the rate of mass transfer which became faster than that of reaction, and overall process was controlled by reaction under the conditions of the bentonite particle size less than 355μm and microwave-power greater than 50 W/g.

关 键 词：膨润土 改性 微波半干法 微波辐射 作用机理 

分 类 号：O611.6[理学—无机化学] O621.3[理学—化学]