乳状液膜分离过程中的结构演变

Structure evolution of emulsion liquid membrane( ELM)in the separation process

以乳状液膜分离H2S,借助激光粒度仪、Zeta电位仪、显微镜等手段研究乳化剂类型及浓度、内相浓度、搅拌速率和时间等因素对液膜粒径的影响。结果表明,搅拌速率及乳化剂类型对其影响最大;4种乳化剂内相粒径按照Span 80、T152、T153及T154的顺序依次增加。时间效应显示,放置24 h后,内相之间存在合并现象。通过将搅拌速度、叶轮直径、液膜密度及界面张力定义为一个Webber数(We=n2DTu3ρ/σ),能够建立其与内相粒径之间的一一对应关系,这将用于预测液膜粒径的范围。该研究对精确构建ELM分离过程中的传质模型提供了直接数据。

Using emulsion liquid membrane to separate hydrogen sulfide. The effect of emulsifier type and concentration,inner phase concentration,and emulsification time and stirring rate are investigated by the laser particle size analyzer,Zeta and microscope,etc. The results show that emulsifier type and stirring rate are the main factor. The diameter of ELM inner phase increase in the following emulsifier order：Span 80,T152,T153 and T154. All the inner phase merged each others in 24 h. Research results also shows that stirring rate,impeller diameter,liquid membrane density,and interface tension can be defined as a Webber number,which has only correlation with inner phase diameter;it also can be used to forecast the ELM inner phase diameter. This study will provide the accurate data for to build the mass transfer model of ELM separation process.