应用界面聚合反应修复ZSM-5分子筛膜缺陷

Application of Interfacial Polymerization in Defect Reparation of ZSM-5 Zeolite Membranes

利用均苯三甲酰氯(TMC)和间苯二胺(MPDA)在分子筛膜表面缺陷处的接触、聚合,形成具有一定孔隙结构且亲水性的聚酰胺修复材料,实现了ZSM-5分子筛膜的选择性修复。修复后的分子筛膜只存在微孔缺陷,整体的孔径分布集中在0.6 nm以下范围,最大缺陷小于1.0 nm;分子筛膜对ca.5%乙醇/水混合物的分离因子从修复前的1.1增大到16.0以上,对应通量在1.0 kg/(m^2·h)以上。

A novel interfacial polymerization method was proposed for selective reparation of ZSM-5 zeolite membranes. Trimesoyl chloride( TMC) and m-phenylenediamine( MPDA) would be contacted at the defect areas on the membrane surface,leading to the formation of porous and hydrophilic materials by polymerization. After reparation,the defects concentrated below 0. 6 nm were in the microporous scale and smaller than 1. 0 nm. The separation factor for 5% C_2H_5OH / H_2O was increased from 1. 1 to 16. 0 with the permeation flux of 1. 0 kg /( m^2·h) and higher.