均相和异相离子交换膜在NaCl浓缩中性能对比

通过考察均相与异相离子交换膜在不同操作条件下的能耗、电流效率、浓缩极限等参数,比较了2种离子交换膜的物理化学性能,并进行了操作参数优化实验。结果表明,均相离子交换膜的优化操作电压和最佳进料液NaCl的质量浓度分别为6 V和30 g/L,异相离子交换膜的优化操作电压和进料液NaCl的质量浓度分别为7.5 V和50g/L。在该优化条件下,采用均相离子交换膜和异相离子交换膜进行浓缩时,浓缩室的NaCl的最高质量浓度分别可达到191.2 g/L和149.3 g/L。异相离子交换膜比均相离子交换膜具有更好的结构稳定性。实验结果对电渗析工程应用中均相离子交换膜与异相离子交换膜的选择具有一定的借鉴与指导意义。

Performance Comparison Between the Homogeneous and Heterogeneous Ion-Exchange Membrane in the Concentration of Sodium Chloride Solution

Parameters such as energy consumption, current efficient and concentration limitation were researched under different operating conditions to analyze the physicochemical performance of both the homogeneous ion-exchange membranes and the heterogeneous ion-exchange membranes and the optimal operation parameters was studied. The result showed that the optimal operating voltage and feed NaCl mass concentration of homogeneous ion-exchange membranes were 6 V and 30 g/L, respectively;and that of the heterogeneous ion-exchange membranes were 7.5 V and 50 g/L, respectively. Under the optimum condition, the maximum mass concentrations of NaCl in concentrated chambers by homogeneous and heterogeneous ion-exchange membranes were 191.2 g/L and 149.3 g/L, respectively. Heterogeneous ion-exchange membrane had better structural stability than homogeneous ion-exchange membrane. The experimental results have some reference and guiding significance for the selection of homogeneous ion exchange membrane and heterogeneous ion exchange membrane in electrodialysis engineering.