氯碱离子膜中的全氟羧酸层及其运行机理研究

Perfluorinated carboxyl acid resin layer and its mechanism in chlor-alkali ionic membrane

基于离子膜烧碱的电解原理,分析了羧酸层树脂的微观结构,认为钠离子和水分子是以水合离子在电驱动下通过膜通道的方式进行迁移的。膜的离子交换基团负责离子簇的形成,并赋予膜以离子透过能力即电导性。结合加工过程解释了离子通道的形成过程,提出曲折贯通的离子通道是羧酸层导电的前提,而阴极侧负电性和弱酸本性导致的动态非完全解离则是阻拦氢氧根的主要屏障。展望了新一代氯碱膜的开发前景,认为在疏水性微孔膜阴极侧制造荷负电的表面是可行的方案。

Based on the fundamental of chlor-alkali electrolyzation, the microstrueture of the perfluorinated carboxyl acid （PFCA） resin layer is analyzed and the working mechanism is put forward that the electrodriven transport of ion and water is carried out by means of ion hydration. The ion-exchange functional groups dominate the formation of ion clusters, and endow the membrane with ion permeation performance and electric conductivity. Combined with the manufacturing process ,the formation process of ion channel is explained and the main mechanism of PFCA resin layer is flexural ion channel through the membrane. And the negative charged cathode side and the incomplete dissociation of weak acid nature is the main barrier to repulse OH-. The new generation of chlor-alkali membrane is prospected and a feasible solution is suggested to create negative charged membrane surface of cathode side.