异相膜和均相膜对EDI过程离子传递的影响  

Influence of homogeneous and heterogeneous membranes on ion transport of electrodeionization process

作　　者：王宗恒[1] 管山[1] 冯冬菊[1] 

机构地区：[1]天津工业大学环境与化学工程学院,天津300387

出　　处：《天津工业大学学报》2013年第2期11-14,共4页Journal of Tiangong University

摘　　要：针对制备超纯水的五隔室电去离子(EDI)膜堆,考察其淡化室阴阳膜分别采用双均相膜、均相阴膜和异相阳膜、均相阳膜和异相阴膜以及双异相膜4种不同情况下过程的电流和脱盐率的变化.结果显示,均相阴膜+异相阳膜组合的膜堆电流和产水电阻率接近于双均相膜的膜堆,而均相阳膜+异相阴膜则与双异相膜的膜堆接近,前者显著高于后者.这表明在实验条件下阴离子在阴膜内的迁移为EDI离子传递的速率控制步骤,其迁移速率增加提高了过程的总传递速率,从而获得较高的脱盐率.Aiming at the five-compartment electrodeionization （EDI） stack for ultrapure water production, four different configurations are tested, which with the diluting compartment consist of dual homogeneous membranes （S1）, a homogeneous anion membrane and a heterogeneous cation membrane （S2）, a homogeneous cation membrane and a heterogeneous anion membrane （S3） and dual heterogeneous membranes （S4）, respectively. The results show that the current and product resistivity of S2, with the same level of S1, are significantly higher than that of S3, which is closed to S4. It is concluded that the migration of anions within the anion membrane is the ratedetermining step of the overall ion transport of the EDI process. The increase of migrating rate improves the overall ion transport and higher salt removal is achieved.

关 键 词：电去离子 异相膜 均相膜 水解离 离子传递 

分 类 号：TQ028.8[化学工程]